7.61 | A 75.0-kg cross-country skier is climbing a 3.0º slope at a constant speed of 2.00 m/s and
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7.62 | The 70.0-kg swimmer in Figure 7.43 starts a race with an initial velocity of 1.25 m/s and
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7.63 | A toy gun uses a spring with a force constant of 300 N/m to propel a 10.0-g steel ball. If
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7.25 | How high a hill can a car coast up (engine disengaged) if work done by friction is negligible
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8.20 | A ball with an initial velocity of 10 m/s moves at an angle 60º above the + x-direction. The
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7.8 | Suppose the ski patrol lowers a rescue sled and victim, having a total mass of 90.0 kg, down a
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7.5 | Calculate the work done by an 85.0-kg man who pushes a crate 4.00 m up along a ramp that makes
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7.7 | A shopper pushes a grocery cart 20.0 m at constant speed on level ground, against a 35.0 N
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7.3 | Calculate the work done on a 1500-kg elevator car by its cable to lift it 40.0 m at constant
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8.29 | Two piloted satellites approach one another at a relative speed of 0.250 m/s, intending to
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8.50 | Two cars collide at an icy intersection and stick together afterward. The first car has a
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8.16 | Calculate the final speed of a 110-kg rugby player who is initially running at 8.00 m/s but
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7.27 | Using energy considerations and assuming negligible air resistance, show that a rock thrown
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