If distance is speed × time and light takes 1.3 seconds to travel from the Moon to Earth and 8 minutes to travel from the Sun to Earth, which of the following statements is true?
a. The Sun is 6.2 times further from Earth than the Moon.
b. The Sun is 10 times further from Earth than the Moon.
c. The Sun is 0.16 times further Earth than the Moon
d. The Sun is 0.10 times further from Earth that the Moon.
e. The Sun is 370 times further from Earth than the Moon.
e
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Projectile Motion: James and John dive from an overhang into the lake below. James simply drops straight down from the edge. John takes a running start and jumps with an initial horizontal velocity of 25 m/s. Compare the time it takes each to reach the lake below if there is no air resistance.
A. James reaches the surface of the lake first. B. John reaches the surface of the lake first. C. James and John will reach the surface of the lake at the same time. D. Cannot be determined without knowing the mass of both James and John. E. Cannot be determined without knowing the weight of both James and John.
Energy Levels: What frequency must a photon have to raise an electron in a hydrogen atom from the n = 2 to the n = 4 state? (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A. 3.06 × 1014 Hz B. 6.16 × 1014 Hz C. 4.11 × 1014 Hz D. 5.20 × 1014 Hz E. 9.24 × 1014 Hz
LR Circuits: A series circuit contains a 1.0-k ? resistor, a 5.0-mH inductor, and an ideal 25-V power supply. What is the time constant for the circuit?
A. 5.0 ?s B. 5.0 s C. 1.6 ?s D. 1.6 s
Consider an object (object A) whose multiplicity is always 1, no matter how much energy you put into it. If you put a very large amount of energy into such an object, and place it into thermal contact with an Einstein solid (object B) having the same number of atoms but much less energy, what will happen?
A. Energy flows from A to B until A has very little energy. B. Energy flows from B to A until B has very little energy. C. Energy flows from A to B until both objects have the same energy. D. No energy will flow between A and B at all. E. Something else happens (describe).