Energy and Momentum: Two objects of different masses have momentum of equal, non-zero magnitude. Which object has more kinetic energy?
A. the heavier object
B. the lighter object
C. They both have the same kinetic energy.
Answer: B
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Applications to Astronomy: Stars A and B are both black holes but have different masses. If the mass of star A is twice as much as the mass of star B, the average density of star A, compared to the average density of star B will be
A. the same. B. twice as much. C. half as much. D. four times as much. E. one-fourth as much.
Kepler's third law, p2 = a3, means that
A) a planet's period does not depend on the eccentricity of its orbit. B) all orbits with the same semimajor axis have the same period. C) the period of a planet does not depend on its mass. D) planets that are farther from the Sun move at slower average speeds than nearer planets. E) All of the above are correct.
An electromagnetic wave with a peak magnetic field component of 7.3 × 10^-7 T has an associated peak electric field component of what value? (m0 = 4p × 10^-7 T×m/A, e0 = 8.85 × 10^-12 C2/N×m2, and c = 3.00 × 10^8 m/s)
a. 45 N/C c. 2.2 × 10^2 N/C b. 2.0 × 10^-5 N/C d. 0.50 × 10^-15 N/C
Which of the following is a correctly balanced equation?
A) P4 + 6 H2 ? 4 PH3 B) 1 P4 + 6 H2 ? 4 PH3 C) 0 P4 + 6 H2 ? 4 PH3 D) 2 P4 + 12 H2 ? 8 PH3 E) P4 + 3 H2 ? PH3