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Chapter 9: Q. 4 (page 227)
The rope in FIGURE Q9.4 pulls the box to the left across a rough surface. Is the
work done by tension positive, negative, or zero? Explain.
Work done is positive .
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Which has the larger kinetic energy, a 10 g bullet fired at
500 m/s or a 75 kg student running at 5.5 m/s?
A ice skater is gliding along the ice, heading due north at . The ice has a small coefficient of static friction, to prevent the skater from slipping sideways, but . Suddenly, a wind from the northeast exerts a force of on the skater.
a. Use work and energy to find the skater鈥檚 speed after gliding in this wind.
b. What is the minimum value of that allows her to continue moving straight north?
A horizontal spring with spring constant is compressed by and then used to launch a box across the floor. The coefficient of kinetic friction between the box and the floor is . What is the box鈥檚 launch speed?
厂耻蝉补苍鈥檚 kg baby brother Paul sits on a mat. Susan pulls the mat across the floor using a rope that is angled above the floor. The tension is a constant N and the coefficient of friction is . Use work and energy to find Paul鈥檚 speed after being pulled m.
If a particle鈥檚 speed increases by a factor of 3, by what factor does its kinetic energy change?
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