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Chapter 9: Q. 7 (page 227)
A 20 g particle is moving to the left at 30 m/s. A force on the particle causes it to move the the right at 30 m/s. How much work is done by the force?
Net work done is zero.
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A 2.0 kg book is lying on a 0.75-m-high table. You pick it up and place it on a bookshelf 2.25 m above the floor.
a. How much work does gravity do on the book?
b. How much work does your hand do on the book?
A particle moves in a vertical plane along the closed path seen in FIGURE Q9.7, starting at A
and eventually returning to its starting point. Is the work done by gravity positive, negative, or
zero? Explain.
The force acting on a particle is . How much work does this force do as the particle moves along the x-axis from to ?
A weather rocket generates a thrust of The rocket, pointing upward, is clamped to the top of a vertical spring. The bottom of the spring, whose spring constant is , is anchored to the ground.
a. Initially, before the engine is ignited, the rocket sits at rest on top of the spring. How much is the spring compressed?
b. After the engine is ignited, what is the rocket鈥檚 speed when the spring has stretched
A horizontal spring with spring constant N/m is attached to a wall. An athlete presses against the free end of the spring, compressing it cm. How hard is the athlete pushing?
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