6.) A 1.1 kg book is lying on a 0.80- m -high table. You pick it up and place it

Question

6.) A 1.1 kg book is lying on a 0.80-m -high table. You pick it up and place it on a bookshelf 2.27 m above the floor. a.) How much work does gravity do on the book? Express your answer to two significant figures and include the appropriate units. b.) How much work does your hand do on the book? Express your answer to two significant figures and include the appropriate units.

7.) To withstand "g-forces" of up to 10 g's, caused by suddenly pulling out of a steep dive, fighter jet pilots train on a "human centrifuge." 10 g's is an acceleration of 98m/s2 .If the length of the centrifuge arm is 14.0 m , at what speed is the rider moving when she experiences 10 g's? Express your answer with the appropriate units.

8.) A horizontal rope is tied to a 48.0 kg box on frictionless ice. What is the tension in the rope if: a.) The box is at rest? b.) The box moves at a steady vx = 4.40 m/s ? c.) The box vx = 4.40 m/s and ax = 4.60 m/s2 ?

Explanation / Answer

A) work done

w = mgh

= 1.1*9.8*(2.27-0.8)

= 16 J

b)w = F s

= m g s

= 1.1*9.8*(2.27-0.8)

= 16J

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