Measuring where the thermal radiation spectrum of a dense object peaks allows us to determine its
A) chemical composition
B) physical size
C) temperature
D) distance
C
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Density: The mass of Mars, 6.40 × 1023 kg, is about one-tenth that of Earth, and its radius, 3395 km, is about half that of Earth. What is the mean density (mass divided by volume) of Mars in kilograms per cubic meter?
A. 9.76 × 102 kg/m3 B. 1.95 × 103 kg/m3 C. 3.90 × 103 kg/m3 D. 7.81 × 103 kg/m3
Angular Momentum: If the answer to your calculation has units of kg ? m2/s, what type of quantity could it be? (There could be more than one correct choice).
A. force B. work C. angular momentum D. linear momentum E. power F. rotational kinetic energy G. moment of inertia H. torque
Coulomb's Law: An electron and a proton are released simultaneously from rest and start moving toward each other due to their electrostatic attraction, with no other forces present. Which of the following statements are true just before they are about to collide? (There could be more than one correct choice.)
A. They are closer to the to the initial position of the electron that to the initial position of the proton. B. They are closer to the to the initial position of the proton that to the initial position of the electron. C. They are at the midpoint of their initial separation. D. They both have the same speed. E. The electrostatic force on the proton is greater than the electrostatic force on the electron.
You are serving the volleyball for the second time in a volleyball game. If the ball leaves your hand with twice the velocity it had on your first serve, its horizontal range R (compared to your first serve) would be
A) twice as much. B) half as much. C) times as much. D) four times as much. E) 2 times as much.