6. On a cold morning, you get up and walk barefoot from the bedroom to the en-su

Question

6. On a cold morning, you get up and walk barefoot from the bedroom to the en-suite bathroom. Your feet feel colder on the bathroom tiles than on the bedroom carpet. The reason is most likely to be: a. Your feet have lost heat during the walk from bedroom to bathroom b. The en-suite is colder than the bedroom The bedroom carpet opposes the flow of heat better than the bathroom tiles d. Carpet is better at radiating away heat than bathroom tiles 7. At the swimming pool there is a large clock on the wall for the benefit of competitive swimmers. Calculate the torque about the pivot point of the second hand, due to its weight, when it is pointing to the "S" on the clock face (30 away from the vertical). Assume the hand is a uniform rod 0.20 m long and weighs 0.005 kg. Keep in mind that the torques on the rod (or any surface) are calculated for forces acting perpendicular to the rod. a. 4.9 x 103 N m clockwise b. 2.5 x 103 N m clockwise c. 4.9 x 103 N m counterclockwise d. 4.2 x 10 N m counterclockwise 8. A titanium metal rod has been inserted into the tibia of an injured soccer player. The rod, which runs the length of the tibia, is 0.55m long and is normally at a constant temperature of 37 °C. Suppose that the soccer player develops a severe fever and his core temperature rises to 40 °C. The linear coefficient for thermal expansion of titanium is 8.6 x 10 K1 By how much will the length of the titanium rod increase? a, 25 m b. 18 um c. 5um d, 14 m 9. What is the force of gravity on a 1,000 Newton woman standing on the Earth's surface? a. 50 N

Explanation / Answer

Answer 6) The bedroom carpet is a bad conductor of heat as compared to the bathroom tiles. Hence it restricts the heat flow from the feet much better than the bathroom tiles. So, the correct option is (c).

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