Which of the following pairs of atomic nuclei would feel the strongest repulsive electromagnetic force if you tried to push them together?
A) helium and helium
B) hydrogen and hydrogen
C) hydrogen and helium
D) hydrogen and deuterium
A
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Star #1 is approaching the Earth with speed v. Star #2 is receding from the Earth with the same speed v. Measurements of the same spectral line from each of the stars show Doppler shifts in frequency. The light from which star will have the larger magnitude shift in frequency?
a. star #1 b. Both stars will have the same shift. c. The value of the speed must be known before an answer can be found. d. star #2
A 4.0 kg mass is moving in a circular path of radius 2.5 m with a constant tangential velocity of 5.0 m/sec. The centripetal force on the mass is
A. 20 N. B. 25 N. C. 35 N. D. 40 N. E. 45 N.
Cart A with momentum p (in magnitude) collides with cart B at rest and rebounds. What can you say about the momentum of cart B after the collision?
Which of the following gases is monatomic?
a. Nitrogen b. Argon c. Hydrogen d. Chlorine