The principle of conservation of energy states that if the total mechanical energy is a constant then
A. the momentum is always a constant
B. no work is done on a system by any nonconservative forces
C. no work is done on a system by any forces
D. work is done on a system in order to conserve energy
B. no work is done on a system by any nonconservative forces
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Describe what the internal structure of the Sun looks like, indicating what physical phenomena are occurring there. In what respects (internal structure, energy generation, etc
) does the internal structure of a high mass Main Sequence star differ from that of the Sun?
Sometimes a flashlight filament glows red instead of white, which indicates a lowness of
A) current in the filament. B) filament temperature. C) both of these D) neither of these
A 5.0-C charge is 10 m from a small test charge. What is the magnitude of the force experienced by a 1.0 nC charge placed at the location of the test charge?
A) 0.045 N B) 0.45 N C) 4.5 N D) 45 N E) 450 N
Two simple pendulums of equal length l = 0.45 m are suspended from the same point. The pendulum bobs are small solid steel spheres. The first bob is drawn back to make a 35° angle with the vertical, while the other one is left hanging at rest
If the first bob has a mass of 0.25 kg and the second has a mass of how high will the second bob rise above its initial position when struck elastically by the first bob after it is released? A) 2.7 cm B) 3.3 cm C) 4.4 cm D) 3.9 cm