SOMEONE PLEASE HELP ME WITH THIS SCIENCE/PHYSICS TEST QUESTION. THE CORRECT ANSWER SHALL BE MARKED AS BRAINLIEST AND I WILL ALSO FOLLOW YOU. (THE GRAPH IS IN THE PHOTO) THANKS XOXO

Emma wanted to investigate the resistance of a sample of a material.
Graph 1 shows how the resistance changes with length.
(the graph in the photo)
Length in centimetres
(i) The current through a 20 cm length of conducting putty was 0.15 A.
Use Graph 1 to find the resistance of a 20 cm length of conducting putty.
Resistance = . ohms

4r-134a enters the condenser of a residential heat pump at 800 kpa and 50°c at a rate of 0.022 kg/s and leaves at 750 kpa subcooled by 3°c. the refrigerant enters the compressor at 200 kpa superheated by 4°c determine (a) the isentropic efficiency of the compressor, (b) the rate of heat supplied to the heated room, and (c) the cop of the heat pump. also, determine (d) the cop and rate of heat supplied to the heated room if this heat pump operated on the ideal vapor-compression cycle between the pressure limits of 200 and 800 kpa. (0.757, 4.37 kw, 5.12, 6.18, 3.91 kw)

The frequency of the fundamental of the guitar string is 320 hz. at what speed v do waves move along that string?

Based on this activity, is kinetic energy always transformed into potential energy?