physics problem help... pls give detailed solutions A shopper in a supermarket p
ID: 2142889 • Letter: P
Question
physics problem help... pls give detailed solutions
A shopper in a supermarket pushes a cart with a force of 35N directed at an angle of 25 degrees below the horizontal. The force is just sufficient to overcome various frictional forces, so the cart moves at constant speed.
a) Find the work done by the shopper as she moves down a 50m lengt aisle.
b) What is the net work done on the cart? why?
c) The shopper goes down the next aisle, pushing horizontally and maintaining the same speed as before. If the work done by frictional forces doesn't change, would the shopper's applied force be larger,smaller or the same? What about the work done on the cart by the shopper?
Explanation / Answer
a.)W=35*50*cos(25)
=1586.03 J
b.)Net work done on the cart is 0 as it is moving with constant velocity because work done by person is equal to opposite work done by friction
c.)It would be small because now shopper pushes horizontally so that thrta is 0
Now work on the cart=35*50-1586.03
=163.96 J ans
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