My Notes 10. 0-10 points Energy: Work-Word Problem A cooler (mass 4.3 kg) is ini

Question

My Notes 10. 0-10 points Energy: Work-Word Problem A cooler (mass 4.3 kg) is initially at rest on a horizontal floor. It is then pushed in a straight line for 1 m by a small child who exerts a horizontal force with magnitude 37 N A.) Use conservation of energy to determine the final speed of the cooler if there is no friction between the cooler and the floor. B.) Use conservation of energy to determine the final speed of the cooler if the coefficient of kinetic . friction between the cooler and the floor is o.30. 11. 0-10 points Energy #1 My Notes A 12 kg block slides up a hill to a height of 7.9 m. If 206 3 of thermal energy are generated, how fast was the block going at the bottom of the hill?

Explanation / Answer

10)

Force , F = 37 N

d =1 m

m = 4.3 Kg

a) let the final speed is v

Using conservation of energy

work done = increase in kinetic energy

37 * 1 = 0.50 * 4.3 * v^2

v = 4.14 m/s

the speed of the cooler is 4.14 m/s

b) if friction is present

let the final speed is v

Using conservation of energy

work done = increase in kinetic energy

(force applied by child - frictional force)* distance = increase in kinetic energy

37 * 1 - 0.30 * 4.3 * 9.8 * 1 = 0.50 * 4.3 * v^2

v = 3.36 m/s

the speed of the cooler is 3.36 m/s

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