A possible design of a "warp drive" might involve
A) generating a shortcut between two distant parts of the universe through a black hole
B) placing a movable massive object like a black hole in front of a spacecraft and using its gravity to shorten the spatial distances in front of the rocket
C) using the annihilation of matter and antimatter to accelerate a spacecraft close to the speed of light
D) generating a shortcut between two distant parts of the universe through hyperspace
B
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Carl has a 5-inch refracting telescope, and Jim has a 3-inch reflecting telescope. Whose telescope has a higher light-gathering power?
A. Carl's, because lenses gather more light. B. Carl's, because the larger the diameter, the more light to be collected. C. Jim's, because the smaller the diameter, the more light to be collected. D. Jim's, because mirrors gather more light.
Two projectiles are fired from ground level at equal speeds but different angles. One is fired at an angle of 30° and the other at 60°. Neglecting air resistance, the projectile to hit the ground first will be the one fired at
A) 30°. B) 60°. C) both hit at the same time
Consider two mercury barometers, one with twice the cross-section area of the other. Mercury in the wider tube will rise
A) to the same height as in the narrow tube. B) twice as high as mercury in the narrow tube. C) four times as high as mercury in the narrow tube. D) more than four times as high as in the narrow tube. E) none of the above
In the first law of thermodynamics, ?U = Q + W, W is positive when
a. the work is being done on the environment by the system. b. the work is being done on the system by the environment. c. the work is being done on the environment by the system, and the temperature of the system goes up. d. the work is being done on the system by the environment, and the temperature of the system goes up.