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Chapter 9: Q. 1 (page 227)
If a particle’s speed increases by a factor of 3, by what factor does its kinetic energy change?
It will change by a factor of 9
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A mother has four times the mass of her young son. Both are running with the same kinetic energy. What is the ratio vson /vmother of their speeds?
You’re fishing from a tall pier and have just caught a fish. As it breaks the surface, essentially at rest, the tension in the vertical fishing line is . Use work and energy to find the fish’s upward speed after you’ve lifted it
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?
a. How much work must you do to push a kg block of steel across a steel table at a steady speed of m/s for s?
b. What is your power output while doing so?
A pile driver lifts a weight and then lets it fall onto the end of a steel pipe that needs to be driven into the ground. A fall of drives the pipe in . What is the average force exerted on the pipe?
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