If a nuclear fission reactor produces an average power of 1.0 GW over the course of a year,
what mass of 235U is used up for a 365-day year if 200 MeV are released per fission reaction? (1 eV = 1.60 × 10-19 J, mneutron ? mproton = 1.67 × 10-27 kg)
A) 0.35 kg B) 3.3 × 108 kg C) 1.1 × 108 kg D) 390 kg E) 1.75 kg
D
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While Earth is experiencing a total solar eclipse, an observer on the side of the Moon facing Earth would see
A) Earth disappear from the sky. B) Earth dim and turn reddish. C) nothing unusual. D) a dark area moving across the face of Earth.
When counting particle-in-a-box quantum states in three dimensions, why do we divide the “volume” of only one eighth of a full spherical shell by the “volume” per quantum state? Why not the full shell’s volume?
A. Molecules in a gas can only have positive momentum components. B. A single quantum energy state embraces both positive and negative values for each momentum component. C. A particle’s momentum magnitude must be positive. D. The factor of 2 in the expression h/2L already counts both possible momentum signs. E. We really do include the full shell: the diagram only shows 1/8 of the shell to make it easier to draw. F. Some other reason (specify).
An electric car is designed to run off a bank of 12-V batteries with total energy storage of 6.0 × 10^7 J. If the electric motor draws 6000 W in moving the car at a steady speed of 10 m/s, how far will the car go before it is "out of juice?"
a. 150 km c. 100 km b. 50 km d. 25 km
The slopes of Olympus Mons are relatively free of impact craters. What does this imply about its history?
A. Olympus Mons has erupted in the last 250 million years. B. Olympus Mons was once submerged in water. C. The mountain is tall enough to be eroded by planetary dust storms. D. It is one of the oldest features on Mars.