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Q. A car moving at 10 m/s crashes into a barrier and stops in 0.50s. There is a 20kg child in the car. Suppose that the child's velocity is changed by the same amount as the cars in the same time period.
1. What is the impulse needed to stop child?
2. What is average force on the child?
3. What is the approximate mass of an object whose weight equals the force in part b?
4. Could you lift such a weight with your arm?
5. Why is it advisable to use a proper restraining seat rather than hold a child on your lap?
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A 50.0 g silver spoon at 20.0 C is placed in a cup of coffee at 90.0 C. How much heat does the spoon absorb from the coffee reach a temperature of 89 C.
what volume should the balloon have after being inflated. Billiard ball A of mass mA=0.400kg moving with speed vA=1.80m/s strikes ball B, initially at rest of mass mB=0.500kg. As a result of collision, ball A is deflected off at an angle of 30.0 deg..
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