A 1000-kg automobile moving with a speed of 24 m/s relative to the road collides with a 500-kg automobile initially at rest. If the two stick together, what is the velocity in m/s of the two cars after the collision according to an observer in a truck moving 10 m/s in the same direction as the moving cars?
a. 6
b. 11
c. 24
d. 26
e. 31
a
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A 200-kg spacecraft is launched to the Moon. While in orbit around the Moon, its weight is ________.
A. zero B. 200 kg C. about 1/6 its weight on Earth D. The answer depends on how close to the Moon the ship is orbiting.
A beam of light with a frequency range of 3.01 × 1014 Hz - 6.10 × 1014 Hz is incident on a metal surface. If the work function of the metal surface is 2.20 eV, what is the maximum kinetic energy of photoelectrons ejected from this surface?
A) 0.32 eV B) 0.21 eV C) 0.42 eV D) 0.16 eV E) 0.48 eV
If F = 40 N and M = 2.0 kg, what is the magnitude of the acceleration of the suspended object? All surfaces are frictionless.
A. 1.2 m/s2 B. 2.0 m/s2 C. 1.5 m/s2 D. 2.5 m/s2 E. 5.6 m/s2
Which of the following statements best describes Einstein's contributions and views about quantum theory?
A) He didn't make any significant contributions to the theory, but he did accept quantum theory. B) Despite his important work on relativity, Einstein didn't make any important contributions to quantum theory, and furthermore he never really accepted quantum theory. C) Although his work on the photoelectric effect was an important contribution to quantum theory, Einstein never really accepted quantum theory. D) Although his work on the quantum theory of atoms was an important contribution, Einstein never really accepted quantum theory. E) His work on the photoelectric effect was an important contribution to quantum theory, and he accepted the theory as a correct description of the microscopic world.