A 5-g coin is dropped from a 300-m building. If it reaches a terminal velocity of 45 m/s, and the rest of the energy is converted to heating the coin, what is the change in temperature (in °C) of the coin? (The specific heat of copper is 387 J/kg/°C.)
a. 9
b. 2
c. 5
d. 21
e. 0.5
c
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At the end of the Kelvin-Helmholtz contraction a star is hundreds of times brighter than it will be as a main sequence star
Indicate whether the statement is true or false
The cosmic background radiation
a. has a blackbody spectrum. b. has its peak emission in the microwave band. c. corresponds to a blackbody at a temperature of 2.726 kelvins. d. all of the above
The space between the stars is known to contain
A. a perfect vacuum. B. a large quantity of dust but no gas at all. C. a variable amount of gas but no dust at all. D. both gas (atomic or molecular) and dust.
If a nucleus decays by ?+ decay to a daughter nucleus, which of the following statements about this decay are correct? (There may be more than one correct choice.)
A) The daughter nucleus has more protons than the original nucleus. B) The daughter nucleus has more neutrons than the original nucleus. C) The daughter nucleus has the same number of nucleons as the original nucleus. D) The daughter nucleus has fewer protons than the original nucleus. E) The daughter nucleus has fewer neutrons than the original nucleus.