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guapka [62]
3 years ago
11

A skier of mass 72 kg is pulled up a slope by a motor-driven cable. a. how much work is required to pull him 75 m up a 30 degree

slope (assumed frictionless) at a constant speed of 3.4 m/s
Physics
1 answer:
likoan [24]3 years ago
8 0

Answer: 26.460\times 10^3\ J

Explanation:

Given the mass of skier m=72 kg

distance traveled d=75 m

constant speed v=3.4 m/s

If speed is constant  then there must no force acting in the direction of motion

i.e. tension force must be equal to the component of weight

T=mg\sin 30^{\circ}

Work done is given by

\Rightarrow W=F\cdot d=Td\cos 0^{\circ}\\\Rightarrow W=mg\sin 30^{\circ} d=72\times 9.8\times 0.5\times 75\\\Rightarrow W=26.460\times 10^3\ J

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