Latent Heats: The figure shows a graph of the temperature of a pure substance as a function of time as heat is added to it at a constant rate in a closed container. If LF is the latent heat of fusion of this substance and LV is its latent heat of vaporization, what is the value of the ratio LV/LF?
A. 5.0
B. 4.5
C. 7.2
D. 3.5
E. 1.5
Answer: D
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Heat Engines: A heat engine absorbs 64 kcal of heat each cycle and exhausts 42 kcal.(a) What is the efficiency of this engine?(b) How much work does this engine do per cycle?
Fill in the blank(s) with the appropriate word(s).
If beam 1 is the incoming beam in the figure below, which of the other four beams are due to refraction?
Two objects, A and B, are placed on an inclined plane that can be rotated to different angles of elevation. A starts to slide at twice the angle of elevation that B starts sliding. The respective coefficients for static friction for A and B are ?A and ?B. Choose the last answer that is correct
a. ?B > ?A b. ?A > ?B c. ?B = 2 ?A d. ?A = 2 ?B
In a volcanic eruption, 2km3 of mountain with a density of 1600 kg=m3 was lifted an average height of 513m.
(a) How much energy in joules was released in this eruption? (b) The energy released by thermonuclear bombs is measured in megatons of TNT, where 1 megaton of TNT = 4.2 * 10 15 J. Convert your answer for (a) to megatons of TNT.