What are these hooks and tassels on the nose?
The things hanging on the left and right side of the nose are pitot covers. They cover the pitot tubes located here:



(Boeing 737 Airplane Characteristics for Airport Planning)

The covers are there to protect the narrow inlets from contamination or blockage:


  Pitot tubes are normally covered when the aircraft is parked for more than a short period of time to reduce the chance of blockage or contamination.


(Pitot Static System on SYKbrary)

They are usually painted red and have REMOVE BEFORE FLIGHT written on them:



(aircraftcovers.com)

Related:


What is the use of this remove before flight cover on the nose of a Bombardier Global 6000?
What steps have been taken to rule out instrument failure due to blocked static ports or pitot tubes?




The cable connected to the right side of the aircraft (left on your image) is the ground power cable. You can see it larger in this image:



(pinterest.com)

Related:


What is the cable connected to a plane for?
What powers an aircraft prior to the APU being switched on?
What&#39;s the plug used on airliners for ground power?