Two astronauts, of masses 60 kg and 80 kg, are initially right next to each other and at rest in outer space. They suddenly push each other apart. How far has the heavier astronaut moved when the lighter astronaut has moved 12 m?
A) 9.0 m B) 21 m C) 7.0 m D) 16 m E) 12 m
A
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In the proton-proton chain
a. no neutrinos are produced. b. energy is released because a helium nucleus has a greater mass than a hydrogen nucleus. c. no photons are produced. d. carbon serves as a catalyst for the nuclear reaction. e. energy is produced in the form of gamma rays and the velocity of the created nuclei.
What's wrong with the statement "heat rises?"
a. Nothing—heat does rise. b. One should say "energy rises.". c. One should say "heated air (or other fluid) rises.". d. none of the above
This photo shows an object located in the halo of our Milky Way galaxy. Notice the many bright red dots in the photograph. What are they?
A) red giant stars B) cool, red main-sequence stars of spectral type M C) old white dwarf stars that have turned red in color D) massive supergiant stars E) starspots
The angular speed of the hour hand of a clock, in rad/min, is
A.
.B.
.C.
.D.
E.