Which of the following indicates that the Sun must be gas from its surface to its center?
A) Its low density and high temperature
B) Its limited gravitational force
C) Its hot spots on the photosphere
D) Its weak magnetic field and small diameter
A
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The statement "The albedo of the near side of the Moon is 0.12" implies that the Moon:
A) absorbs only 12 percent of the light that hits it. B) reflects only 12 percent of the light that hits it. C) orbits Earth with an inclination of 12°. D) revolves around the Sun with an inclination of 12°.
The fundamental force that governs the motion of the planets is
A. strong force. B. weak force. C. electromagnetic force. D. gravitational force.
A sticky hockey puck slides along a frictionless, horizontal ice surface at 75 m/s in the +x direction. It collides with a second sticky puck originally sliding at 25 m/s in the -y direction. They collide totally inelastically. If the first puck has a mass equal to half that of the second, what is the angle of their final velocity vector below the +x direction?
A. 9.5 degrees B. 42 degrees C. 34 degrees D. 49 degrees E. 37 degrees
The plates of a parallel-plate capacitor are maintained with constant voltage by a battery as they are pulled apart. What happens to the strength of the electric field during this process?
A) It increases. B) It decreases. C) It remains constant. D) cannot be determined from the information given