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Q. A ball is dropped from a height of 1.60m and rebounds to a height of 1.10m. How many rebounds will the ball make before losing as a minimum 90 percent of its energy?

Q. A person eats a dessert that contains 260 Calories. (This "Calorie" unit, with a capital C, is the one used by nutritionists; 1 Calorie = 4186J. The skin temperature of a person is 36 °C and that of her environment is 21°C. The emissivity of her skin is 0.750 and its surface area is 1.30 m2. How much time would it take for her to emit a net radiant energy from her body that is equal to energy contained in this dessert?

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