Consider a situation where two moving objects collide and rebound from each other. Internal energy
a. remains constant
b. decreases
c. increases
d. varies but in a way that cannot be predicted
C
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Why is the greenhouse effect weaker on Mars than on Earth or Venus?
A. High water vapor clouds reduce the amount of sunlight that reaches the planet's surface. B. There is no carbon dioxide in Mars's atmosphere. C. Mars's atmosphere is much thinner than those of Venus and Earth. D. Fog and frost on the Martian surface reflect much of the Sun's energy.
What defines a calorie?
a. The amount of heat that raises the temperature of one ounce of water by one degree Fahrenheit. b. The work done by the weight of one kilogram of water moving downward through a distance of one meter. c. The amount of heat that raises the temperature of one gram of water by one degree Celsius. d. The amount of work that raises the temperature of one gram of water by one degree Celsius. e. The amount of work that raises the temperature of one ounce of water by one degree Fahrenheit.
By the time the Universe was about two minutes old, protons and neutrons could link to form _____, the nucleus of a heavy hydrogen atom, and not be broken apart again
A) uranium B) helium C) nitrogen D) deuterium
Potential of Point-Charges: The electric potential at a distance of 4 m from a certain point charge is 200 V relative to infinity. What is the potential (relative to infinity) at a distance of 2 m from the same charge?
A. 200 V B. 50 V C. 400 V D. 100 V E. 600 V