Observer A sees a ruler moving by in a relativistic train and measures its length to be LA. Observer B moves together with the train and measures the length of the ruler to be LB. These two results will be such that
A) LA > LB.
B) LA = LB.
C) LA < LB.
D) LA could be greater or smaller than LB depending on the direction of the motion.
C
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Which statement most accurately describes the relationship between the largest and smallest planets?
A) The largest planet is 6000 times as wide (in diameter) and 30 times as massive as the smallest. B) The largest planet is 6000 times as wide (in diameter) and 6000 times as massive as the smallest. C) The largest planet is 30 times as wide (in diameter) and 30 times as massive as the smallest. D) The largest planet is 30 times as wide (in diameter) and 6000 times as massive as the smallest.
Hot coffee is poured into a cylindrical container until it is nearly full. The container is immediately sealed by stretching a rubber balloon across the container mouth and tightly sealing the edges. Twenty minutes later, you observe that the still intact rubber seal
A. has bulged outward only at the edges of the container mouth. B. is still flat across the entire mouth of the container. C. has sagged inward toward the coffee. D. has bulged outward in the center of the mouth of the container.
Two springs, each with spring constant 33.0 N/m, are connected in parallel, and the combination is hung vertically from one end. A 18.0-N weight is then suspended from the other end of the combined spring. How far does the combined spring stretch as it comes to equilibrium?
a. 0.545 m b. 0.136 m c. 1.09 m d. 0.273 m e. 2.18 m
An astronaut who weighs 800 N on the surface of the Earth lifts off from planet Zuton in a space ship. The free-fall acceleration on Zuton is 3.0 m/s2 (down). At the moment of liftoff the acceleration of the space ship is 0.50 m/s2 (up). What is the magnitude of the force of the space ship on the astronaut?
A. 41 N B. 0.29 kN C. 0.24 kN D. 0.20 kN E. 0.37 kN