(b) The load and the spring are taken down. Two people pull in opposite directio
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(b) The load and the spring are taken down. Two people pull in opposite directions on the ends of the spring with a force of 180 N·Find the length of the spring in this situation. cm My Notes O Au o -1.33 points SercP10 5 P050 WI skier of mass 76 kg is pulled up a slope by a motor driven cable (a) How much work is required to pull him 50 tm up a 30e slope (assurned frictionless) at a constant speed of 2.1 m/s? k) (bj what power (expressed in hp) must a motor have to perform this task? hp My Notes Ask Your 0.3718.37 points l Previous Arewers See 105 mono. object of mass 3.00 kg is subject to a force Fs that varies with pesition as in the fiqure below. F, IN)Explanation / Answer
mass of skier=76 kg
vertical height theskier has to be moved=50*sin30=25 m
work required to be done = increase in potential energy of skier=76*9.8*25=18620 Joules=18.62 kJ
speed = 2.1 m/s
distance moved = 50 m
time taken = 50/2.1=23.81 seconds
power required = 18620/23.81=782 Watts = 1.05 horse power
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