Posted by JU on Saturday, November 20, 2010 at 4:31pm.
The force component along the direction of motion is T cos 35 = 63.0 N. Only the force component in that direction can do wrk. In 30 seconds the water skier moves 450 m. The Work done is 63 x 450 = 28,360 J
2) Since the speed does not change, all of the work done by the tow rope is used up overcoming friction. Friction does negative work of 28,360 J.
how did you get 450m? because the distance wasnt given in this problem
450 m is how far the water skier is pulled in 30 seconds at 15 m/s.
You chose to multiply power by time, which is OK, but you got the power wrong.
ok thank you i got it. still baffled on how the distace is 450
but i multiplyed
90*450*cos35
w=f*d*costheta
and 33175 was the answer
thank you
1)The tension of the rope in the x direction is 90*cos35 = 73.7
v=15m/s
t = 30
The equation for Power is W/t and F*v
Thus W/t=F*v
W=t*F*v
W=30*73.7*15
W=32850
2)the water does the same work in the opposite direction.
W=-32850
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