Sue is traveling toward you at 90 km/hr. She throws a baseball that, according to her, is going at 90 km/hr in the opposite direction. What do you see the ball doing?
A) You see the ball traveling away from you at 90 km/hr.
B) You see the ball remaining stationary.
C) You see the ball traveling away from you at 180 km/hr.
D) You see the ball traveling toward you at 90 km/hr.
E) You see the ball traveling toward you at 180 km/hr.
B
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The Laser Interferometer Gravitational-Wave Observatory (LIGO) made the first detection of gravitational waves in 2016. Which of the following best describes the discovery?
A) The detection verified that gravitational waves exist as predicted by the general theory of relativity. B) The detection of gravitational waves was a huge surprise because no one had predicted they would exist prior to their discovery. C) There is still considerable doubt whether LIGO really detected gravitational waves. D) The detection of gravitational waves contradicted predictions made by the general theory of relativity, requiring scientists to revise the theory.
The length of a certain wire is doubled while its radius is kept constant. What is the new resistance of this wire?
A) It stays the same. B) It is 2 times as large. C) It is 3 times as large. D) It is 4 times as large. E) It is 1/2 as large.
An ideal gas is confined to a container with adjustable volume. The pressure and mole number are constant. By what factor will volume change if absolute temperature doubles?
a. 4.0 c. 1/2 b. 2.0 d. 1/4
How can we determine an asteroid's reflectivity?
A) by determining its mass B) by comparing its infrared thermal emission to its visible-light reflection C) by seeing how dark or light it looks in telescopic images D) by determining how far from the Sun it is E) by determining its size