How can we determine the reflectivity of an asteroid?
A) by comparing its brightness in visible light to its brightness in infrared light
B) by taking a photograph of it
C) by measuring its mass and radius
D) by where it is located in the asteroid belt
A) by comparing its brightness in visible light to its brightness in infrared light
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Exhibit 12-1
The figure below shows a graph of angular velocity versus time for a woman bicycling around a circular track.
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Use this exhibit to answer the following question(s).
Refer to Exhibit 12-1. What is her angular displacement (in rad) in the 16-minute period shown in the graph?
A. 0 B. 16? C. 32? D. 40? E. 64?
A beam of white light of a certain frequency is incident on a metal surface. If the work function of this surface is 2.20 eV, what frequency of light would give a maximum kinetic energy of 0.25 eV to the photoelectrons ejected from this surface?
A) 2.05 × 1014 Hz B) 1.02 × 1014 Hz C) 2.50 × 1014 Hz D) 3.53 × 1014 Hz E) 5.92 × 1014 Hz
Household 120-V outlets are made to accept three-pronged plugs. One of the prongs attaches to the "live" wire at 120 V, and another attaches to the "neutral" wire that is connected to ground. What is the round third prong for?
a. It serves as a backup to the hot wire. b. It lets the appliance run if the neutral wire breaks. c. It connects the case of the appliance directly to ground for safety purposes. d. Nothing electrical, it is for mechanical sturdiness.
Consider two cylinders of gas identical in all respects except that one contains O2 and the other He. Both hold the same volume of gas at STP and are closed by a movable piston at one end
Both gases are now compressed adiabatically to one-third their original volume. Which gas will show the greater pressure increase? A) the O2 B) the He C) neither; both will show the same increase D) impossible to tell from the information given