Respuesta :
Answer:
Explanation:
Given
velocity of skateboarder is 4.1 m/s
Force [tex]F_x=14,F_y=12 N [/tex]
time=20 s
As the motion is along x axis therefore
Power [tex]=F\cdot v[/tex]
Power[tex]=14\times 4.1=57.4 Watt[/tex]
only x component of force comes into play because there is no motion in Y direction.
Work done will be[tex]=P\times t=57.4\times 20=1148 J[/tex]
Work done on skate boarder by rope is 1148 J
and work done on bicyclist by rope is -1148 as the direction of velocity is opposite to applied force
Work is the product of force and displacement. The work that will be done by the rope is 1,394 J.
What is Work?
Work is the product of force and displacement.
W = F·ds
Given to us
The velocity of the woman, v = 4.1 m/s
The force exerted by the woman on the rope, F = (17N )x + (12N )y
Time, t = 20 seconds
We know that work is given as,
[tex]W = f\cdot ds[/tex]
Now since the skateboard is moving in only x-direction, only the horizontal component of force will work, also, the displacement will be (vt), therefore,
[tex]W = (17)\cdot (4.1 \times 20)\\\\W = 1,394\rm\ J[/tex]
hence, the work that will be done by the rope is 1,394 J.
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