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Chapter 9: Q. 33 (page 229)
Justin, with a mass of kg, is going down an -m-high water slide. He starts at rest, and his speed at the bottom is m/s. How much thermal energy is created by friction during his descent?
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A kg sprinter, starting from rest, runs m in s at constant acceleration.
a. What is the magnitude of the horizontal force acting on the sprinter?
b. What is the sprinter鈥檚 power output at s, s, and s?
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 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 farmer uses a tractor to pull a bale of hay up a incline to the barn at a steady . The coefficient of kinetic friction between the bale and the ramp is . What is the tractor鈥檚 power output?
A kg air compressor is dragged up a rough incline from m to m, where theaxis is vertical. How much work does gravity do on the compressor during this displacement?
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