17. Exercises
From Mechanics
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</div>{{#NAVCONTENT:Answer|Answer 17.2|Solution|Solution 17.2}} | </div>{{#NAVCONTENT:Answer|Answer 17.2|Solution|Solution 17.2}} | ||
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| + | ===Exercise 17.3=== | ||
| + | <div class="ovning"> | ||
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| + | A ball, of mass 0.125 kg, is thrown so that its initial speed is | ||
| + | 12 <math>\text{m}{{\text{s}}^{-1}}</math>. As the ball moves upwards its speed decreases to 4 <math>\text{m}{{\text{s}}^{-1}}</math> when it is at its maximum height. | ||
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| + | a) Calculate the initial kinetic energy of the ball. | ||
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| + | b) Calculate the minimum kinetic energy of the ball. | ||
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| + | c) Calculate the potential energy of the ball at its maximum height. | ||
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| + | </div>{{#NAVCONTENT:Answer a|Answer 17.3a|Answer b|Answer 17.3b|Answer c|Answer 17.3c|Solution a|Solution 17.3a|Solution b|Solution 17.3b|Solution c|Solution 17.3c}} | ||
Revision as of 17:41, 15 November 2009
| Theory | Exercises |
Exercise 17.1
Calculate the kinetic energy of a car, of mass 1200 kg, travelling at 30 \displaystyle \text{m}{{\text{s}}^{-1}}.
Answer
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Solution
Exercise 17.2
Calculate the kinetic energy of a ball, which has mass 250 grams, and which is travelling at 9 \displaystyle \text{m}{{\text{s}}^{-1}}.
Answer
Solution
Exercise 17.3
A ball, of mass 0.125 kg, is thrown so that its initial speed is 12 \displaystyle \text{m}{{\text{s}}^{-1}}. As the ball moves upwards its speed decreases to 4 \displaystyle \text{m}{{\text{s}}^{-1}} when it is at its maximum height.
a) Calculate the initial kinetic energy of the ball.
b) Calculate the minimum kinetic energy of the ball.
c) Calculate the potential energy of the ball at its maximum height.
Answer a
Answer b
Answer c
Solution a
Solution b
Solution c
