Three identical 6.0-kg cubes are placed on a horizontal frictionless surface in contact with one another. The cubes are lined up from left to right and a force is applied to the left side of the left cube causing all three cubes to accelerate to the right at 3.0 m/s2 . What is the magnitude of the force exerted on the right cube by the middle cube in this case?
a. 12 N
c. 24 N
b. 18 N
d. none of the above
B
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Which statement about planetary rings is not true?
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On a cosmic calendar, in which the history of the universe is compressed into 1 year, when did the dinosaurs become extinct?
A) in late December B) in late November C) in late October D) in late September E) in late August
Including relativistic effects, doubling the speed of a object:
a. has no effect on its momentum. c. less than doubles its momentum. b. more than doubles its momentum. d. doubles its momentum.
When radium-224 emits an alpha particle, the remaining daughter nucleus is which of the following?
a. actinium-215 c. bismuth-215 b. lead-213 d. radon-220