An oxygen molecule falls in a vacuum. From what height must it fall so that its kinetic energy at the bottom equals the average energy of an oxygen molecule at 920 K?
A) 36,500 meters
B) 12,100 meters
C) 24,300 meters
D) 48,700 meters
A
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Force on a Moving Charge: A proton, moving north, enters a magnetic field. Because of this field, the proton curves downward. We may conclude that the magnetic field must have a component
A. downward. B. upward. C. towards the east. D. towards the west. E. towards the north.
A toy elevator is raised from the ground floor to the second floor in 20 seconds. The power needed using 1000 J of work, is
A) 20 W. B) 50 W. C) 100 W. D) 1000 W. E) 20,000 W.
How long does it take our solar system to complete one orbit around the Milky Way Galaxy?
A) 100 million years B) 1 million years C) 230 thousand years D) 10 thousand years E) 230 million years
What do many physicists expect is required to explain why space is "flat" (i.e., that parallel lines stay parallel)?
a. A theory of everything. b. Gravitational waves. c. Dark matter. d. The four forces. e. Proton decay.