A 4.8 \"kilo\" bag of sugar is on a counter. How much work is required to put th

Question

A 4.8 "kilo" bag of sugar is on a counter. How much work is required to put the bag on a shelf a distance of 0.44 m above the counter? In J.



How much work is required to lift a 4.0 kg concrete block to a height of 1.5 m?

In J.



A man pushes a lawn mower on a level lawn with a force of 210 N. If 40% of this force is directed downward, how much work is done by the man in pushing the mower 6.4 m? In J.



A 62 kg student traveling in a car with a constant velocity has a kinetic energy of 1.2 104 J. What is the speedometer reading of the car in km/h? In km/h.

Explanation / Answer

W = mgh = 4.8 * 9.8 * 0.44 = 20.6976 J ;

W = mgh = 4 * 9.8 * 1.5 = 58.8 J ;

40 % is downward , so 60 % must be frontward ,

W = F.x = 0.6 * 210 * 6.4 = 806.4 J ;

1/2 m v^2 = K ;

0.5 * 62 * v^2 = 1.2 e 4 ;

or v = 19.67 m /s

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