The cooling effect inside a refrigerator is produced by
A) an electric motor that converts electrical energy to internal energy.
B) compressing the refrigeration gas.
C) vaporizing the refrigeration liquid.
D) proper insulation.
E) exchanging warmer air with colder air.
Answer: C
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The velocity v(t) of a particle as a function of time is given by v(t) = (2.3 m/s) + (4.1 m/s2)t - (6.2 m/s3)t2. What is the average acceleration of the particle between t = 1.0 s and t = 2.0 s?
A) -15 m/s2 B) 0 m/s2 C) 13 m/s2 D) 15 m/s2 E) -13 m/s2
To transmit four times as much energy per unit time along a string, you can
a. double the frequency. b. double the amplitude. c. increase the tension by a factor of 16. d. do any one of the above. e. do only (a) or (b) above.
Do you think it is possible that a 10-solar-mass main-sequence star could harbor an advanced civilization? Explain your reasoning
What will be an ideal response?
What is a pulsar?
A) a star that alternately expands and contracts in size B) a rapidly rotating neutron star C) a neutron star or black hole that happens to be in a binary system D) a binary system that happens to be aligned so that one star periodically eclipses the other E) a star that is burning iron in its core