Why doesn't the Moon have an atmosphere?
A. The blasts that formed the craters blew it away.
B. The Moon's atmosphere was drawn away from it by Earth's stronger gravitational force.
C. It had very few volcanoes and the gravity is too weak to hold a substantial atmosphere.
D. The solar wind evaporated the Moon's atmosphere.
Answer: C
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Carnot Engine: An ideal Carnot engine operates between a high temperature reservoir at 492 K and a river with water at 290 K. If it absorbs 4000 J of heat each cycle, how much work per cycle does it perform?
A. 1642 J B. 2358 J C. 1483 J D. 2517 J
Jupiter gives back into space twice the energy it gets from the distant Sun. Where is this energy coming from, for the most part?
A) the impact energy of comets like SL-9 B) helium rain descending into its mantle and core C) the slow escape of gravitational energy left from its formation D) the radioactive decay of U-238 in its iron-rich core, just as with the Earth E) the combined tidal stress of all four large Galilean moons
Rotational Kinetic Energy: A uniform solid cylinder with a radius of 10 cm and a mass of 3.0 kg is rotating about its center with an angular speed of 33.4 rpm. What is its kinetic energy?
A. 0.18 J B. 0.092 J C. 0.96 J D. 1.1 J E. 17 J
Convergent boundaries are areas of
A) compressional forces that crunch the crust and generate a spreading center. B) tensional forces that stretch the crust and generate a spreading center. C) crustal formation. D) plate collision.