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NDQ_013403 | Air flows faster below than above an airplane wing. | null | a. true, b. false | b | T_3800 | image | textbook_images/properties_of_electromagnetic_waves_22425.png | FIGURE 21.4 Light slows down when it enters water from the air. This causes the wave to refract, or bend. | 0.341547 |
NDQ_013403 | Air flows faster below than above an airplane wing. | null | a. true, b. false | b | T_3622 | image | textbook_images/pressure_of_fluids_22300.png | FIGURE 15.10 How does Bernoullis law explain each of these examples? | 0.294412 |
NDQ_013403 | Air flows faster below than above an airplane wing. | null | a. true, b. false | b | DQ_012212 | image | question_images/optics_reflection_9188.png | optics_reflection_9188.png | 0.285488 |
NDQ_013403 | Air flows faster below than above an airplane wing. | null | a. true, b. false | b | DQ_011173 | image | question_images/optics_refraction_9193.png | optics_refraction_9193.png | 0.284029 |
NDQ_013403 | Air flows faster below than above an airplane wing. | null | a. true, b. false | b | DQ_002554 | image | abc_question_images/earth_eclipses_11656.png | earth_eclipses_11656.png | 0.277075 |
NDQ_013403 | Air flows faster below than above an airplane wing. | null | a. true, b. false | b | DQ_002449 | image | abc_question_images/types_clouds_18206.png | types_clouds_18206.png | 0.276248 |
NDQ_013403 | Air flows faster below than above an airplane wing. | null | a. true, b. false | b | DQ_011175 | image | question_images/optics_refraction_9194.png | optics_refraction_9194.png | 0.268577 |
NDQ_013403 | Air flows faster below than above an airplane wing. | null | a. true, b. false | b | DQ_000447 | image | abc_question_images/layers_of_atmosphere_18100.png | layers_of_atmosphere_18100.png | 0.267933 |
NDQ_013403 | Air flows faster below than above an airplane wing. | null | a. true, b. false | b | DQ_000440 | image | abc_question_images/layers_of_atmosphere_17069.png | layers_of_atmosphere_17069.png | 0.266461 |
NDQ_013403 | Air flows faster below than above an airplane wing. | null | a. true, b. false | b | DQ_002545 | image | abc_question_images/earth_eclipses_11627.png | earth_eclipses_11627.png | 0.261286 |
NDQ_013403 | Air flows faster below than above an airplane wing. | null | a. true, b. false | b | T_3801 | text | null | Although all electromagnetic waves travel at the same speed, they may differ in their wavelength and frequency. | 0.654423 |
NDQ_013403 | Air flows faster below than above an airplane wing. | null | a. true, b. false | b | T_0229 | text | null | Air temperature in the stratosphere layer increases with altitude. Why? The stratosphere gets most of its heat from the Sun. Therefore, its warmer closer to the Sun. The air at the bottom of the stratosphere is cold. The cold air is dense, so it doesnt rise. As a result, there is little mixing of air in this layer. | 0.640789 |
NDQ_013403 | Air flows faster below than above an airplane wing. | null | a. true, b. false | b | T_1578 | text | null | The atmosphere has different properties at different elevations above sea level, or altitudes. | 0.640561 |
NDQ_013403 | Air flows faster below than above an airplane wing. | null | a. true, b. false | b | T_0205 | text | null | We usually cant sense the air around us unless it is moving. But air has the same basic properties as other matter. For example, air has mass, volume and, of course, density. | 0.631248 |
NDQ_013403 | Air flows faster below than above an airplane wing. | null | a. true, b. false | b | T_1753 | text | null | The atmosphere is layered, corresponding with how the atmospheres temperature changes with altitude. By under- standing the way temperature changes with altitude, we can learn a lot about how the atmosphere works. | 0.630498 |
NDQ_013403 | Air flows faster below than above an airplane wing. | null | a. true, b. false | b | T_0269 | text | null | Sometimes two air masses stop moving when they meet. These stalled air masses create a stationary front. Such a front may bring clouds and precipitation to the same area for many days. | 0.612687 |
NDQ_013403 | Air flows faster below than above an airplane wing. | null | a. true, b. false | b | T_0916 | text | null | Air masses are slowly pushed along by high-level winds. When an air mass moves over a new region, it shares its temperature and humidity with that region. So the temperature and humidity of a particular location depends partly on the characteristics of the air mass that sits over it. | 0.612312 |
NDQ_013403 | Air flows faster below than above an airplane wing. | null | a. true, b. false | b | T_0262 | text | null | An air mass is a large body of air that has about the same conditions throughout. For example, an air mass might have cold dry air. Another air mass might have warm moist air. The conditions in an air mass depend on where the air mass formed. | 0.609857 |
NDQ_013403 | Air flows faster below than above an airplane wing. | null | a. true, b. false | b | T_0222 | text | null | Air temperature changes as altitude increases. In some layers of the atmosphere, the temperature decreases. In other layers, it increases. You can see this in Figure 15.12. Refer to this figure as you read about the layers below. | 0.607699 |
NDQ_013403 | Air flows faster below than above an airplane wing. | null | a. true, b. false | b | T_4889 | text | null | The speed of sound is the distance that sound waves travel in a given amount of time. Youll often see the speed of sound given as 343 meters per second. But thats just the speed of sound under a certain set of conditions, specifically, through dry air at 20 C. The speed of sound may be very different through other matter or at other temperatures. | 0.605785 |
NDQ_013404 | The spoiler on a racecar acts like an upside-down wing. | null | a. true, b. false | a | T_3622 | image | textbook_images/pressure_of_fluids_22300.png | FIGURE 15.10 How does Bernoullis law explain each of these examples? | 0.252541 |
NDQ_013404 | The spoiler on a racecar acts like an upside-down wing. | null | a. true, b. false | a | T_4260 | image | textbook_images/compound_machine_22737.png | FIGURE 1.1 | 0.232984 |
NDQ_013404 | The spoiler on a racecar acts like an upside-down wing. | null | a. true, b. false | a | DQ_005624 | image | question_images/parts_chordate_body_7157.png | parts_chordate_body_7157.png | 0.203261 |
NDQ_013404 | The spoiler on a racecar acts like an upside-down wing. | null | a. true, b. false | a | T_4742 | image | textbook_images/projectile_motion_23032.png | FIGURE 1.2 | 0.195754 |
NDQ_013404 | The spoiler on a racecar acts like an upside-down wing. | null | a. true, b. false | a | T_0735 | image | textbook_images/renewable_energy_resources_20492.png | FIGURE 5.9 Solar panels on top of a car could power the car. This technology is a long way from being practical. | 0.194324 |
NDQ_013404 | The spoiler on a racecar acts like an upside-down wing. | null | a. true, b. false | a | T_1713 | image | textbook_images/solar_power_21130.png | FIGURE 1.3 | 0.19364 |
NDQ_013404 | The spoiler on a racecar acts like an upside-down wing. | null | a. true, b. false | a | T_0479 | image | textbook_images/reducing_air_pollution_20332.png | FIGURE 22.14 This is a model of a hydrogen car. A major problem with hydrogen cars is the lack of hydrogen fuel. | 0.193156 |
NDQ_013404 | The spoiler on a racecar acts like an upside-down wing. | null | a. true, b. false | a | DD_0252 | image | teaching_images/lewis_dot_diagrams_9146.png | Water is a transparent common substance that makes up the earth's oceans, lakes, seas, rivers, streams and more. Water is essential for every living thing to replenish and hydrate. The chemical formula for water contains one oxygen atom to two hydrogen atoms. Everything from the earth's crust to the human brain contain great amounts of water. Water on earth is continually being used and then goes through the water cycle to become new and usable again. The water cycle involves evaporation, transpiration, condensation, precipitation and runoff. Even though water does not have any calories or nutritional benefit it is essential to all living forms on earth. Fishing which occurs in salt and fresh type waters yields much food for the world's people. Water even involves exercise for those who like to swim and engage in other sports like water skiing, wakeboarding and so on. | 0.192888 |
NDQ_013404 | The spoiler on a racecar acts like an upside-down wing. | null | a. true, b. false | a | DQ_011999 | image | question_images/lewis_dot_diagrams_9149.png | lewis_dot_diagrams_9149.png | 0.192888 |
NDQ_013404 | The spoiler on a racecar acts like an upside-down wing. | null | a. true, b. false | a | DQ_011993 | image | question_images/lewis_dot_diagrams_9145.png | lewis_dot_diagrams_9145.png | 0.192888 |
NDQ_013404 | The spoiler on a racecar acts like an upside-down wing. | null | a. true, b. false | a | T_4536 | text | null | Most cars have at least four cylinders connected to the crankshaft. Their pistons move up and down in sequence, one after the other. A powerful car may have eight pistons, and some race cars may have even more. The more cylinders a car engine has, the more powerful its engine can be. | 0.470502 |
NDQ_013404 | The spoiler on a racecar acts like an upside-down wing. | null | a. true, b. false | a | T_4811 | text | null | An experiment is a controlled scientific study of specific variables. A variable is a factor that can take on different values. For example, the speed of an object down a ramp might be one variable, and the steepness of the ramp might be another. | 0.460972 |
NDQ_013404 | The spoiler on a racecar acts like an upside-down wing. | null | a. true, b. false | a | T_3801 | text | null | Although all electromagnetic waves travel at the same speed, they may differ in their wavelength and frequency. | 0.446691 |
NDQ_013404 | The spoiler on a racecar acts like an upside-down wing. | null | a. true, b. false | a | T_1298 | text | null | Different factors play into the composition of a magma and the rock it produces. | 0.438601 |
NDQ_013404 | The spoiler on a racecar acts like an upside-down wing. | null | a. true, b. false | a | T_1740 | text | null | The Suns surface features are quite visible, but only with special equipment. For example, sunspots are only visible with special light-filtering lenses. | 0.431696 |
NDQ_013404 | The spoiler on a racecar acts like an upside-down wing. | null | a. true, b. false | a | T_0777 | text | null | Plates move apart at divergent plate boundaries. This can occur in the oceans or on land. | 0.430531 |
NDQ_013404 | The spoiler on a racecar acts like an upside-down wing. | null | a. true, b. false | a | T_4535 | text | null | In a car, the piston in the engine is connected by the piston rod to the crankshaft. The crankshaft rotates when the piston moves up and down. The crankshaft, in turn, is connected to the driveshaft. When the crankshaft rotates, so does the driveshaft. The rotating driveshaft turns the wheels of the car. | 0.430241 |
NDQ_013404 | The spoiler on a racecar acts like an upside-down wing. | null | a. true, b. false | a | T_4885 | text | null | How fast or slow something moves is its speed. Speed determines how far something travels in a given amount of time. The SI unit for speed is meters per second (m/s). Speed may be constant, but often it varies from moment to moment. | 0.430179 |
NDQ_013404 | The spoiler on a racecar acts like an upside-down wing. | null | a. true, b. false | a | T_4889 | text | null | The speed of sound is the distance that sound waves travel in a given amount of time. Youll often see the speed of sound given as 343 meters per second. But thats just the speed of sound under a certain set of conditions, specifically, through dry air at 20 C. The speed of sound may be very different through other matter or at other temperatures. | 0.429647 |
NDQ_013404 | The spoiler on a racecar acts like an upside-down wing. | null | a. true, b. false | a | T_0228 | text | null | The stratosphere is the layer above the troposphere. The layer rises to about 50 kilometers (31 miles) above the surface. | 0.428061 |
NDQ_013405 | Air pressure decreases slowly at lower altitudes and then more quickly at higher altitudes. | null | a. true, b. false | b | DQ_010969 | image | question_images/convection_of_air_6662.png | convection_of_air_6662.png | 0.31964 |
NDQ_013405 | Air pressure decreases slowly at lower altitudes and then more quickly at higher altitudes. | null | a. true, b. false | b | T_3618 | image | textbook_images/pressure_of_fluids_22296.png | FIGURE 15.6 This graph shows how air pressure de- creases with increasing altitude. the air pressure on the surface of the drink. Because fluid flows from an area of high to low pressure, the drink moves up the straw and into your mouth. When you breathe, a muscle called the diaphragm causes the rib cage and lungs to expand or contract. When they expand, the air in the lungs is under less pressure than the air outside the body, so air flows into the lungs. When the ribs and lungs contract, air in the lungs is under greater pressure than air outside the body, so air flows out of the lungs. | 0.311038 |
NDQ_013405 | Air pressure decreases slowly at lower altitudes and then more quickly at higher altitudes. | null | a. true, b. false | b | T_4114 | image | textbook_images/air_pressure_and_altitude_22656.png | FIGURE 1.1 | 0.307374 |
NDQ_013405 | Air pressure decreases slowly at lower altitudes and then more quickly at higher altitudes. | null | a. true, b. false | b | T_1773 | image | textbook_images/thunderstorms_21158.png | FIGURE 1.2 giant. Eventually, the drops become large enough to fall to the ground. At this time, the thunderstorm is mature, and it produces gusty winds, lightning, heavy precipitation, and hail (Figure 1.2). | 0.304577 |
NDQ_013405 | Air pressure decreases slowly at lower altitudes and then more quickly at higher altitudes. | null | a. true, b. false | b | T_4471 | image | textbook_images/gases_22862.png | FIGURE 1.3 | 0.29539 |
NDQ_013405 | Air pressure decreases slowly at lower altitudes and then more quickly at higher altitudes. | null | a. true, b. false | b | T_0268 | image | textbook_images/changing_weather_20164.png | FIGURE 16.9 How does an occluded front differ from a warm or cold front? | 0.295053 |
NDQ_013405 | Air pressure decreases slowly at lower altitudes and then more quickly at higher altitudes. | null | a. true, b. false | b | DQ_000533 | image | question_images/rain_shadow_7536.png | rain_shadow_7536.png | 0.290531 |
NDQ_013405 | Air pressure decreases slowly at lower altitudes and then more quickly at higher altitudes. | null | a. true, b. false | b | T_3800 | image | textbook_images/properties_of_electromagnetic_waves_22425.png | FIGURE 21.4 Light slows down when it enters water from the air. This causes the wave to refract, or bend. | 0.290504 |
NDQ_013405 | Air pressure decreases slowly at lower altitudes and then more quickly at higher altitudes. | null | a. true, b. false | b | DQ_010981 | image | question_images/convection_of_air_8046.png | convection_of_air_8046.png | 0.288521 |
NDQ_013405 | Air pressure decreases slowly at lower altitudes and then more quickly at higher altitudes. | null | a. true, b. false | b | DQ_000460 | image | question_images/layers_of_atmosphere_7069.png | layers_of_atmosphere_7069.png | 0.28535 |
NDQ_013405 | Air pressure decreases slowly at lower altitudes and then more quickly at higher altitudes. | null | a. true, b. false | b | T_1578 | text | null | The atmosphere has different properties at different elevations above sea level, or altitudes. | 0.79302 |
NDQ_013405 | Air pressure decreases slowly at lower altitudes and then more quickly at higher altitudes. | null | a. true, b. false | b | T_1753 | text | null | The atmosphere is layered, corresponding with how the atmospheres temperature changes with altitude. By under- standing the way temperature changes with altitude, we can learn a lot about how the atmosphere works. | 0.755829 |
NDQ_013405 | Air pressure decreases slowly at lower altitudes and then more quickly at higher altitudes. | null | a. true, b. false | b | T_1755 | text | null | The property that changes most strikingly with altitude is air temperature. Unlike the change in pressure and density, which decrease with altitude, changes in air temperature are not regular. A change in temperature with distance is called a temperature gradient. | 0.734248 |
NDQ_013405 | Air pressure decreases slowly at lower altitudes and then more quickly at higher altitudes. | null | a. true, b. false | b | T_0916 | text | null | Air masses are slowly pushed along by high-level winds. When an air mass moves over a new region, it shares its temperature and humidity with that region. So the temperature and humidity of a particular location depends partly on the characteristics of the air mass that sits over it. | 0.723944 |
NDQ_013405 | Air pressure decreases slowly at lower altitudes and then more quickly at higher altitudes. | null | a. true, b. false | b | T_0229 | text | null | Air temperature in the stratosphere layer increases with altitude. Why? The stratosphere gets most of its heat from the Sun. Therefore, its warmer closer to the Sun. The air at the bottom of the stratosphere is cold. The cold air is dense, so it doesnt rise. As a result, there is little mixing of air in this layer. | 0.721974 |
NDQ_013405 | Air pressure decreases slowly at lower altitudes and then more quickly at higher altitudes. | null | a. true, b. false | b | T_0251 | text | null | Humidity is the amount of water vapor in the air. High humidity increases the chances of clouds and precipitation. | 0.719313 |
NDQ_013405 | Air pressure decreases slowly at lower altitudes and then more quickly at higher altitudes. | null | a. true, b. false | b | T_0269 | text | null | Sometimes two air masses stop moving when they meet. These stalled air masses create a stationary front. Such a front may bring clouds and precipitation to the same area for many days. | 0.711377 |
NDQ_013405 | Air pressure decreases slowly at lower altitudes and then more quickly at higher altitudes. | null | a. true, b. false | b | T_0262 | text | null | An air mass is a large body of air that has about the same conditions throughout. For example, an air mass might have cold dry air. Another air mass might have warm moist air. The conditions in an air mass depend on where the air mass formed. | 0.708153 |
NDQ_013405 | Air pressure decreases slowly at lower altitudes and then more quickly at higher altitudes. | null | a. true, b. false | b | T_0914 | text | null | An air mass is a batch of air that has nearly the same temperature and humidity (Figure 1.1). An air mass acquires these characteristics above an area of land or water known as its source region. When the air mass sits over a region for several days or longer, it picks up the distinct temperature and humidity characteristics of that region. | 0.703729 |
NDQ_013405 | Air pressure decreases slowly at lower altitudes and then more quickly at higher altitudes. | null | a. true, b. false | b | T_1235 | text | null | The high and low pressure areas created by the six atmospheric circulation cells also determine in a general way the amount of precipitation a region receives. Rain is common in low pressure regions due to rising air. Air sinking in high pressure areas causes evaporation; these regions are usually dry. These features have a great deal of influence on climate. | 0.703172 |
NDQ_013406 | In a hydraulic car lift, more pressure is applied to the hydraulic fluid than the fluid applies to the car. | null | a. true, b. false | b | T_3620 | image | textbook_images/pressure_of_fluids_22299.png | FIGURE 15.9 Pascals law explains why fluid can be used to transmit pressure in a car lift. | 0.398453 |
NDQ_013406 | In a hydraulic car lift, more pressure is applied to the hydraulic fluid than the fluid applies to the car. | null | a. true, b. false | b | T_3624 | image | textbook_images/buoyancy_of_fluids_22302.png | FIGURE 15.12 Fluid pressure exerts force on all sides of this object, but the force is greater at the bottom of the object where the fluid is deeper. | 0.288904 |
NDQ_013406 | In a hydraulic car lift, more pressure is applied to the hydraulic fluid than the fluid applies to the car. | null | a. true, b. false | b | T_4183 | image | textbook_images/buoyancy_22689.png | FIGURE 1.1 | 0.287884 |
NDQ_013406 | In a hydraulic car lift, more pressure is applied to the hydraulic fluid than the fluid applies to the car. | null | a. true, b. false | b | T_0287 | image | textbook_images/weather_forecasting_20178.png | FIGURE 16.23 The greater the air pressure outside the tube, the higher the mercury rises inside the tube. Mercury can rise in the tube because theres no air pressing down on it. | 0.270916 |
NDQ_013406 | In a hydraulic car lift, more pressure is applied to the hydraulic fluid than the fluid applies to the car. | null | a. true, b. false | b | T_4180 | image | textbook_images/boyles_law_22686.png | FIGURE 1.1 | 0.266679 |
NDQ_013406 | In a hydraulic car lift, more pressure is applied to the hydraulic fluid than the fluid applies to the car. | null | a. true, b. false | b | T_4583 | image | textbook_images/lipid_classification_22927.png | FIGURE 1.3 | 0.241107 |
NDQ_013406 | In a hydraulic car lift, more pressure is applied to the hydraulic fluid than the fluid applies to the car. | null | a. true, b. false | b | T_4095 | image | textbook_images/carbon_and_living_things_22645.png | FIGURE 9.22 The arrangement of phospholipid molecules in a cell membrane allows the membrane to control what enters and leaves the cell. | 0.241107 |
NDQ_013406 | In a hydraulic car lift, more pressure is applied to the hydraulic fluid than the fluid applies to the car. | null | a. true, b. false | b | T_2466 | image | textbook_images/cell_structures_21578.png | FIGURE 3.8 Arrangement of phospholipids in a cell membrane | 0.238809 |
NDQ_013406 | In a hydraulic car lift, more pressure is applied to the hydraulic fluid than the fluid applies to the car. | null | a. true, b. false | b | DQ_010923 | image | question_images/simple_machines_7560.png | simple_machines_7560.png | 0.237165 |
NDQ_013406 | In a hydraulic car lift, more pressure is applied to the hydraulic fluid than the fluid applies to the car. | null | a. true, b. false | b | T_3949 | image | textbook_images/behavior_of_gases_22549.png | FIGURE 4.16 A tire pressure gauge measures the pressure of the air inside a car tire. Why is the pressure likely to increase as the car is driven? | 0.237101 |
NDQ_013406 | In a hydraulic car lift, more pressure is applied to the hydraulic fluid than the fluid applies to the car. | null | a. true, b. false | b | T_4535 | text | null | In a car, the piston in the engine is connected by the piston rod to the crankshaft. The crankshaft rotates when the piston moves up and down. The crankshaft, in turn, is connected to the driveshaft. When the crankshaft rotates, so does the driveshaft. The rotating driveshaft turns the wheels of the car. | 0.667611 |
NDQ_013406 | In a hydraulic car lift, more pressure is applied to the hydraulic fluid than the fluid applies to the car. | null | a. true, b. false | b | T_1542 | text | null | Oil is a liquid fossil fuel that is extremely useful because it can be transported easily and can be used in cars and other vehicles. Oil is currently the single largest source of energy in the world. | 0.664519 |
NDQ_013406 | In a hydraulic car lift, more pressure is applied to the hydraulic fluid than the fluid applies to the car. | null | a. true, b. false | b | T_4536 | text | null | Most cars have at least four cylinders connected to the crankshaft. Their pistons move up and down in sequence, one after the other. A powerful car may have eight pistons, and some race cars may have even more. The more cylinders a car engine has, the more powerful its engine can be. | 0.659953 |
NDQ_013406 | In a hydraulic car lift, more pressure is applied to the hydraulic fluid than the fluid applies to the car. | null | a. true, b. false | b | T_4533 | text | null | A combustion engine is a complex machine that burns fuel to produce thermal energy and then uses the energy to do work. In a car, the engine does the work of providing kinetic energy that turns the wheels. The combustion engine in a car is a type of engine called an internal combustion engine. (Another type of combustion engine is an external combustion engine.) | 0.637384 |
NDQ_013406 | In a hydraulic car lift, more pressure is applied to the hydraulic fluid than the fluid applies to the car. | null | a. true, b. false | b | T_3708 | text | null | A combustion engine is a complex machine that burns fuel to produce thermal energy and then uses the energy to do work. Two basic types of combustion engines are external and internal combustion engines. | 0.63508 |
NDQ_013406 | In a hydraulic car lift, more pressure is applied to the hydraulic fluid than the fluid applies to the car. | null | a. true, b. false | b | T_4438 | text | null | A combustion engine is a complex machine that burns fuel to produce thermal energy and then uses the thermal energy to do work. There are two types of combustion engines: external and internal. A steam engine is an external combustion engine. | 0.631787 |
NDQ_013406 | In a hydraulic car lift, more pressure is applied to the hydraulic fluid than the fluid applies to the car. | null | a. true, b. false | b | T_0715 | text | null | Oil is a thick, dark brown or black liquid. It is found in rock layers of the Earths crust. Oil is currently the most commonly used source of energy in the world. | 0.628475 |
NDQ_013406 | In a hydraulic car lift, more pressure is applied to the hydraulic fluid than the fluid applies to the car. | null | a. true, b. false | b | T_0700 | text | null | Energy is the ability to do work. Fuel stores energy and can be released to do work. Heat is given off when fuel is burned. | 0.622001 |
NDQ_013406 | In a hydraulic car lift, more pressure is applied to the hydraulic fluid than the fluid applies to the car. | null | a. true, b. false | b | T_3960 | text | null | Solids that change to gases generally first pass through the liquid state. However, sometimes solids change directly to gases and skip the liquid state. The reverse can also occur. Sometimes gases change directly to solids. | 0.621936 |
NDQ_013406 | In a hydraulic car lift, more pressure is applied to the hydraulic fluid than the fluid applies to the car. | null | a. true, b. false | b | T_0251 | text | null | Humidity is the amount of water vapor in the air. High humidity increases the chances of clouds and precipitation. | 0.615685 |
NDQ_013407 | a push or pull | null | a. fluid, b. Bernoullis law, c. force, d. pascal, e. Pascals law, f. hydraulics, g. lift | c | T_3573 | image | textbook_images/what_is_force_22256.png | FIGURE 13.3 A book resting on a table is acted on by two opposing forces. | 0.277939 |
NDQ_013407 | a push or pull | null | a. fluid, b. Bernoullis law, c. force, d. pascal, e. Pascals law, f. hydraulics, g. lift | c | DD_0211 | image | teaching_images/simple_machines_9246.png | Shown in the diagram are the six types of simple machines. A simple machine is a mechanical device that makes work easier. It includes the inclined plane, wedge, lever, wheel and axle, screw and pulley. An inclined plane is a flat surface that is slanted, or inclined, so it can help move objects across distances. A common inclined plane is a ramp used to lift heavy objects in a back of a truck. Instead of using the smooth side of the inclined plane to make work easier, you can also use the pointed edges to do other kinds of work. When you use the edge to push things apart, this movable inclined plane is called a wedge. An ax blade is one example of a wedge. Any tool that pries something loose is a lever. Levers can also lift objects. A lever is an arm that turns against a fulcrum (the point or support on which a lever pivots). Think of the claw end of a hammer that you use to pry nails loose; itÕs a lever. The Wheel and Axle makes work easier by moving objects across distances. The wheel (or round end) turns with the axle (or cylindrical post) causing movement. On a wagon, for example, a container rests on top of the axle to help transport heavy objects. A Screw helps you do work is that it can be easily turned to move itself through a solid space like turning a jar cover to keep it the jar air tight. Instead of an axle, a wheel could also rotate a rope, cord, or belt. This variation of the wheel and axle is the pulley. In a pulley, a cord wraps around a wheel. Instead of an axle, you can use the wheelÕs rotation to raise and lower objects, making work easier. On a flagpole, for example, a rope is attached to a pulley to raise and lower the flag more easily. | 0.276718 |
NDQ_013407 | a push or pull | null | a. fluid, b. Bernoullis law, c. force, d. pascal, e. Pascals law, f. hydraulics, g. lift | c | T_3571 | image | textbook_images/what_is_force_22255.png | FIGURE 13.2 Forces can vary in both strength and direction. | 0.270308 |
NDQ_013407 | a push or pull | null | a. fluid, b. Bernoullis law, c. force, d. pascal, e. Pascals law, f. hydraulics, g. lift | c | T_4447 | image | textbook_images/force_22843.png | FIGURE 1.2 | 0.265798 |
NDQ_013407 | a push or pull | null | a. fluid, b. Bernoullis law, c. force, d. pascal, e. Pascals law, f. hydraulics, g. lift | c | T_4856 | image | textbook_images/simple_machines_23078.png | FIGURE 1.3 | 0.264774 |
NDQ_013407 | a push or pull | null | a. fluid, b. Bernoullis law, c. force, d. pascal, e. Pascals law, f. hydraulics, g. lift | c | T_4662 | image | textbook_images/newtons_third_law_22977.png | FIGURE 1.1 | 0.264693 |
NDQ_013407 | a push or pull | null | a. fluid, b. Bernoullis law, c. force, d. pascal, e. Pascals law, f. hydraulics, g. lift | c | DQ_010948 | image | question_images/simple_machines_9247.png | simple_machines_9247.png | 0.255589 |
NDQ_013407 | a push or pull | null | a. fluid, b. Bernoullis law, c. force, d. pascal, e. Pascals law, f. hydraulics, g. lift | c | DQ_011283 | image | question_images/circuits_1545.png | circuits_1545.png | 0.246164 |
NDQ_013407 | a push or pull | null | a. fluid, b. Bernoullis law, c. force, d. pascal, e. Pascals law, f. hydraulics, g. lift | c | T_3802 | image | textbook_images/properties_of_electromagnetic_waves_22426.png | FIGURE 21.5 Wavelength and frequency of electromagnetic waves. | 0.244312 |
NDQ_013407 | a push or pull | null | a. fluid, b. Bernoullis law, c. force, d. pascal, e. Pascals law, f. hydraulics, g. lift | c | T_3642 | image | textbook_images/machines_22316.png | FIGURE 16.11 A ramp is a machine because it makes work easier by changing a force. How does it change force? | 0.24387 |
NDQ_013407 | a push or pull | null | a. fluid, b. Bernoullis law, c. force, d. pascal, e. Pascals law, f. hydraulics, g. lift | c | T_4823 | text | null | Newtons third law of motion is just one of many scientific laws. A scientific law is a statement describing what always happens under certain conditions. Other examples of laws in physical science include: Newtons first law of motion Newtons second law of motion Newtons law of universal gravitation Law of conservation of mass Law of conservation of energy Law of conservation of momentum | 0.555671 |
NDQ_013407 | a push or pull | null | a. fluid, b. Bernoullis law, c. force, d. pascal, e. Pascals law, f. hydraulics, g. lift | c | T_4940 | text | null | Friction is the force that opposes motion between any surfaces that are in contact. There are four types of friction: static, sliding, rolling, and fluid friction. Static, sliding, and rolling friction occur between solid surfaces. Fluid friction occurs in liquids and gases. All four types of friction are described below. | 0.541536 |
NDQ_013407 | a push or pull | null | a. fluid, b. Bernoullis law, c. force, d. pascal, e. Pascals law, f. hydraulics, g. lift | c | T_4885 | text | null | How fast or slow something moves is its speed. Speed determines how far something travels in a given amount of time. The SI unit for speed is meters per second (m/s). Speed may be constant, but often it varies from moment to moment. | 0.540924 |
NDQ_013407 | a push or pull | null | a. fluid, b. Bernoullis law, c. force, d. pascal, e. Pascals law, f. hydraulics, g. lift | c | T_4438 | text | null | A combustion engine is a complex machine that burns fuel to produce thermal energy and then uses the thermal energy to do work. There are two types of combustion engines: external and internal. A steam engine is an external combustion engine. | 0.532657 |
NDQ_013407 | a push or pull | null | a. fluid, b. Bernoullis law, c. force, d. pascal, e. Pascals law, f. hydraulics, g. lift | c | T_4844 | text | null | An electric circuit consists of at least one closed loop through which electric current can flow. Every circuit has a voltage source such as a battery and a conductor such as metal wire. A circuit may have other parts as well, such as lights and switches. In addition, a circuit may consist of one loop or two loops. | 0.524838 |
NDQ_013407 | a push or pull | null | a. fluid, b. Bernoullis law, c. force, d. pascal, e. Pascals law, f. hydraulics, g. lift | c | T_3942 | text | null | Energy is defined as the ability to cause changes in matter. You can change energy from one form to another when you lift your arm or take a step. In each case, energy is used to move matter you. The energy of moving matter is called kinetic energy. | 0.522302 |
NDQ_013407 | a push or pull | null | a. fluid, b. Bernoullis law, c. force, d. pascal, e. Pascals law, f. hydraulics, g. lift | c | T_4322 | text | null | Distance is the length of the route between two points. The distance of a race, for example, is the length of the track between the starting and finishing lines. In a 100-meter sprint, that distance is 100 meters. | 0.51924 |
NDQ_013407 | a push or pull | null | a. fluid, b. Bernoullis law, c. force, d. pascal, e. Pascals law, f. hydraulics, g. lift | c | T_1797 | text | null | The two types of air pollutants are primary pollutants, which enter the atmosphere directly, and secondary pollutants, which form from a chemical reaction. | 0.519211 |
NDQ_013407 | a push or pull | null | a. fluid, b. Bernoullis law, c. force, d. pascal, e. Pascals law, f. hydraulics, g. lift | c | T_0726 | text | null | Nuclear energy is produced by splitting the nucleus of an atom. This releases a huge amount of energy. | 0.518427 |
NDQ_013407 | a push or pull | null | a. fluid, b. Bernoullis law, c. force, d. pascal, e. Pascals law, f. hydraulics, g. lift | c | T_0698 | text | null | Energy changes form when something happens. But the total amount of energy always stays the same. The Law of Conservation of Energy says that energy cannot be created or destroyed. Scientists observed that energy could change from one form to another. They also observed that the overall amount of energy did not change. | 0.511746 |
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