Two blocks with masses 2.0 kg and 3.0 kg are placed on a horizontal frictionless surface. A light spring is placed in a horizontal position between the blocks. The blocks are pushed together, compressing the spring, and then released from rest. After contact with the spring ends, the 3.0-kg mass has a speed of 2.0 m/s. How much potential energy was stored in the spring when the blocks were
released?
a. 15 J
b. 3.0 J
c. 6.0 J
d. 12 J
e. 9.0 J
A
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Within the boundaries of the constellations Coma and Virgo are found
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An astronaut is traveling at a high rate of speed from the Earth to a distant star system. Observers here on Earth note the relativistic effect that the astronaut's clocks run slow. What relativistic effect, if any, does the astronaut observe?
a. Her pulse rate slows. b. The distance from the Earth to the star system has decreased. c. Her clocks run faster. d. There is no relativistic effect to be observed by the astronaut since she is the one doing the moving.
Equilibrium: A 10.0-kg picture is held in place by two wires, the first one hanging at 50.0° to the left of the vertical and the second one at 45.0° to the right of the vertical. What is the tension in the first wire?
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