In a nuclear plant, 1017 J of energy is available from mass conversion. How much mass was lost?
A)
0.1 kg
B)
1 kg
C)
10 kg
D)
100 kg
E)
1000 kg
B
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If an interstellar gas cloud shrinks in size, what does the law of conservation of angular momentum predict it will do?
A) heat up B) spin slower C) cool off D) continue shrinking E) spin faster
If a hydrogen atom, originally in its ground state of energy –13.6 eV, absorbs a photon of energy 22.0 eV, what is the resulting kinetic energy of the electron if the proton has negligible kinetic energy?
a. Such a photon cannot be absorbed in this case. b. 8.4 eV c. 2.4 eV d. 16.0 eV
What is the ratio of the light gathering power of a 10 m telescope to that of a 1 m telescope?
a. 10 to 1 b. 1 to 10 c. 100 to 1 d. 1 to 100 e. 3.2 to 1
A 4.00 kg object is moving at 5.00 m/s NORTH. It strikes a 6.00 kg object that is moving EAST at 2.00 m/s. The objects have a completely inelastic (stick together) collision. The velocity of the 6.00 kg object after the collision is
A. 2.33 m/s at an angle of 35.0 degrees NORTH of EAST. B. 2.33 m/s at an angle of 59.0 degrees NORTH of EAST. C. 2.00 m/s at an angle of 59.0 degrees NORTH of EAST. D. 2.00 m/s at an angle of 45.0 degrees NORTH of EAST. E. 2.33 m/s at an angle of 45.0 degrees NORTH of EAST.