What do you see orbiting Earth in this photo?
A) the Hubble Space Telescope
B) the world's largest visible-light telescope
C) the Spitzer infrared telescope
D) the International Space Station
A) the Hubble Space Telescope
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An object has a mass of 60 kg on Earth. What are the mass and weight of this object on the surface of the Moon where the acceleration due to gravity is only 1/6 of what it is on Earth?
What will be an ideal response?
Is it physically possible [even though it might be impractical to actually carry out] to drive a ship across the ocean by using the thermal energy in the surface waters of the ocean? That is, could this be done without violating any principle of physics?
A) No, because there is no thermal energy in the ocean. B) No, because this process would violate the second law of thermodynamics. C) Yes, by exhausting the unused thermal energy into the stratosphere or into the deep ocean, where the temperature is cooler than that of the ocean's surface. D) Yes, by exhausting the unused thermal energy into Earth's lower atmosphere, where the temperature is warmer than that of the ocean's surface. E) No, because this process would violate the law of conservation of energy.
A situation known as "population inversion" is needed for lasing action. What does "population inversion" mean?
A. Electrons are in the -1/2 state. B. Excited atoms must be at the top of the laser tube. C. Excited atoms must be at the bottom of the laser tube. D. The number of excited states that are to emit photons are in greater number than the lower states at which the transition is ending. E. The number of lower states are in greater number than the upper states participating in the lasing action.
The amount of energy equivalent to two kilogram of mass at rest is
A) 18 × 1016 J. B) 9.0 × 1016 J. C) 3.0 × 108 J. D) 6.0 × 108 J. E) none of the given answers