As a result of friction between internal parts of an isolated system
A. the total mechanical energy of the system increases.
B. the total mechanical energy of the system decreases.
C. the total mechanical energy of the system remains the same.
D. the potential energy of the system increases but the kinetic energy remains the same.
E. the kinetic energy of the system increases but the potential energy of the system remains the same.
Answer: B
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During the course of a demonstration the professor is called away. When he returns he finds a beaker of water that was at room temperature is now at a slightly higher temperature. There is a stirring rod on the desk and a cigarette lighter. The professor can assume that the temperature increase is due to
A. heat added to the system. B. either heat added or mechanical work done. C. mechanical work done on the system.
Radio telescopes are often located near populated areas
a. True b. False Indicate whether the statement is true or false
Energy in Nuclear Reactions: Consider the nuclear reaction: 7Li + 1p ? 4He + 4He. The known atomic masses are7Li: 7.016005 u
He: 4.002603 u1p: 1.007825 uWhat is the Q-value (or reaction energy) of this reaction? (1 u = 931.5 MeV/c2)
A. 13.57 MeV B. 15.37 MeV C. 17.35 MeV D. 17.53 MeV
Which statement about antimatter is not true?
A) Antimatter has been hypothesized to exist but has never actually been detected. B) An antielectron (positron) is identical to an ordinary electron except it has a positive charge. C) Every ordinary particle has a corresponding antiparticle. D) When a particle and its antiparticle meet, the result is mutual annihilation that turns all of the mass into energy.