A woman does 135 J of work to move a table 3. 0 m across the floor. What is the

Question

A woman does 135 J of work to move a table 3. 0 m across the floor. What is the magnitude of the force that the woman applied to the table if this force is applied in the horizontal direction? A 0. 5-kg ball has a velocity of 22 m/s. What is the kinetic energy of the ball? For the ball from the preceeding problem, how much work would be required to stop the ball? A weight lifter raises a 105-kg barbell to a height of 1. 9 m. What is the barbell's change in potential energy? At the low point in its swing, a pendulum bob with a mass of 0. 7 kg has a velocity of 3. 5 m/s. Ignoring air resistance, how high will the bob swing above the low point before reversing direction?

Explanation / Answer

8. W = Fs

F = 135/3 = 45 N

optiuon D
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9. KE    = 0.5 mv^2

KE = 0.5* 0.5* 22*22 = 121 J

option B
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10. W = KE = 121 J

option D
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5. PE    = mgh

PE = 105* 9.8 * 1.9   = 1957 J

option D
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6.
KE = 0.5* 0.7* 3.5*3.5 = 4.29 J

option E it is
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7. h = v^2/2g

h = 3.5*3.5/(2*9.8)

h = 0.62 m

option E

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