Question1marilyn m and her identical in every way twin, Ask an Expert

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Question1

Marilyn (M) and her (identical in every way) twin sister Sheila (S) are riding on a merry-go-round revolving at a constant rate. Sheila is half way in from the edge. Which best explains relationship between the angular momentum of the two sisters?

Question2

The acceleration of gravity is 9.8 m/s2.
If speed of the child at the lowest position is 2.21972 m/s, what is mechanical energy dissipated by the various resistive forces (such as friction, etc.)?
Answer in units of J

Question3

A person eats a dessert that contains 260 Calories. (This "Calorie" unit, with a capital C, is the one used by nutritionists; 1 Calorie = 4186 J.) The skin temperature of this individual is 36°C and that of her environment is 21° C. The emissivity of her skin is 0.75 and its surface area is 1.3 m2. How much time would it take for her to make a net radiant energy from her body that is equivalent to energy contained in this dessert?

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Category:- Physics
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