An ore car of mass 4 000 kg starts from rest and rolls downhill on tracks from a mine. A spring with k = 400 000 N/m is located at the end of the tracks. At the spring's maximum compression, the car is at an elevation 10 m lower than its elevation at the starting point. How much is the spring compressed in stopping the ore car? Ignore friction
1.4 m
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Voyagers 1 and 2 were examples of which kind of space mission?
A) flyby B) orbiter C) sample return D) lander/probe
In order for a substance to sustain a fission chain reaction, one important condition is that
A) each fissioning nucleus must release a sufficient number of neutrons. B) the nuclei must collide with enough energy to overcome the electrical repulsion between them. C) each fissioning nucleus must release a sufficient number of alpha-particles. D) energy must be continually supplied from the outside. E) the nuclei must stay in shape by maintaining a regular jogging program.
A 4.0 ?F and a 6.0 ?F capacitor are connected in series across an 8.0-V DC source. What is the charge on the 6.0 ?F capacitor?
A) 2.0 ?C B) 4.0 ?C C) 12 ?C D) 25 ?C E) 19 ?C
Suppose we put 20 non-interacting quantons into a one-dimensional box of length L. The quantons quickly settle into the lowest possible energy states available. Roughly how many times larger will the quantons’ total energy be if they are fermions as opposed to bosons?
A. About the same B. About 4 times C. About 10 times D. About 40 times E. About 400 times