QUESTION 1 Amy uses 58N of force to push a lawn mower 55 meters. How much work d

Question

QUESTION 1 Amy uses 58N of force to push a lawn mower 55 meters. How much work does she do? QUESTION 2 A shopper in a supermarket pushes a cart with a force of 79 N. If the shopper does 1,830 J of work pushing the cart down the length of the aisle, how long is the shopping aisle QUESTION 3 Suppose a force of 134 N is used to push an object a distance of 15 m in 18 s. Find the power for this situation. QUESTION 4 With an elevation of 5334 m above sea level, the village of Aucanquilca, Chile is the highest inhabited town in the world. What would be the gravitationailenergy associated with a 65 kg person in Aucanquilca? QUESTION 5 An athlete is able to pole vault 4.6 m. If the pole vaulter's gravitational potential is 4,367 J, what is his mass?

Explanation / Answer

1.

Workdone is given by:

W = F*d

F = Force

d = distance travelled

Using given values:

W = 58*55 = 3190 J (Joule)

2.

d = W/F = 1830/79

d = length of shooping isle = 23.16 m

3.

Power = Work/time = F*d/t

P = 134*15/18

P = 111.67 W (Watt)

4.

Gravitational potential energy is given by:

GPE = m*g*h

GPE = 65*9.81*5334

GPE = 3401225.1 J

5.

from above equation

m = GPE/(g*h)

m = 4367/(9.81*4.6)

m = 96.77 kg

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