When Venus first formed it had large quantities of water vapor in its atmosphere while today only very low levels of water are present. Where did most of the water vapor go?
A) it was destroyed in the atmosphere by ultraviolet light from the Sun
B) it became chemically incorporated into rocks in the crust
C) it was blasted into space by impacts
D) it escaped into space
A
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A Trombe wall is a masonry wall often used in passive solar homes to store solar energy. Suppose that such a wall, fabricated from 20-cm-thick solid concrete blocks (k = 0.13 W/(mK), ? = 0.05 × 10–5 m2/s) is initially at 15°C in equilibrium with the room in which it is located. It is suddenly exposed to sunlight and absorbs 500 W/m2 on the exposed face. The exposed face loses heat by radiation and convection to the outside ambient temperature of –15°C through a combined heat transfer coefficient of 10 W/(m2 K). The other face of the wall is exposed to the room air through a heat transfer coefficient of 10 W/(m2 K). Assuming that the room air temperature does not change, determine the maximum temperature in the wall after 4 hours of exposure and the net heat transferred to the room.
GIVEN • Trombe wall suddenly exposed to sunlight FIND (a) Maximum temperature in the wall after 4 hours (b) Heat input to the room
The orbit of the planet Jupiter is an ellipse with the Sun at one focus. What is located at the other focus?
a. the asteroid belt b. Earth c. Saturn d. Jupiter e. nothing
Suppose there are 3 molecules in a container. If each molecule has a 1-in-2 chance of being in the left half of the container, what is the probability that there are exactly 2 molecules in the left half of the container?
A. 1/2 B. 1/3 C. 1/8 D. 3/8 E. 3/5
Kepler was finally able to absolutely prove the truth of his theory of the motion of the planets by using
A) the data of Tycho Brahe. B) his own highly accurate observations of the planets. C) data gathered by the ancient Greeks. D) All of the above. E) Nonsense--it is impossible to prove that a theory is true.