15. Exercises
From Mechanics
| Theory | Exercises |
Exercise 15.1
Calculate the momentum of
a) a train, of mass 120 tonnes, travelling at 40 \displaystyle \text{m}{{\text{s}}^{-1}},
b) a table tennis ball, of mass 3 grams, travelling at 4 \displaystyle \text{m}{{\text{s}}^{-1}},
c) a car, of mass 1200 kg, travelling at 36 kmph.
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Exercise 15.2
A ball, of mass 100 grams, is travelling horizontally at 8 \displaystyle \text{m}{{\text{s}}^{-1}} when it hits a wall and rebounds at 5 \displaystyle \text{m}{{\text{s}}^{-1}}. Assume that all the motion is perpendicular to the wall. Calculate the magnitude of the impulse on the ball.
Exercise 15.3
A van, of mass of 4 tonnes, is travelling at 25 \displaystyle \text{m}{{\text{s}}^{-1}} along a straight road. As it approaches a traffic light it slows down to 8 \displaystyle \text{m}{{\text{s}}^{-1}}. Calculate the magnitude of the impulse on the van.
