A 4.0-kg mass, initially at rest on a horizontal frictionless surface, is struck by a 2.0-kg mass moving along the x axis with a speed of 8.0 m/s. After the collision, the 2.0-kg mass has a speed of 4.0 m/s at an angle of 37° from the positive x axis. What is the speed of the 4.0-kg mass after the collision?
a. 2.0 m/s
b. 2.7 m/s
c. 4.9 m/s
d. 2.4 m/s
e. 3.6 m/s
b
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The Leaning Tower of Pisa is 55 m tall and about 7.0 m in diameter. The top is 4.5 m off center. How much farther can it lean before it becomes unstable?
A) 0.5 m B) 1.5 m C) 2.5 m D) 3.5 m E) 4.5 m
When a force acts on an object from an angle other than either 0° or 180° to the direction of motion:
a. the force is not in the direction of motion, so no work gets done. b. the force is perpendicular to the direction of motion, so no work gets done. c. the parallel and perpendicular component of the force both do work. d. the parallel vector component of the force does work but the perpendicular one does not. e. the perpendicular vector component of the force does work but the parallel one does not.
Compared to radio waves, the velocity of visible light waves in a vacuum is
A) less. B) more. C) the same.
If you have 7 total 100-W light bulbs in a parallel circuit in your basement and you leave them on for 1.5 days, how much energy (in kilowatt hours) would be used?
a. 25.2 kWh b. 1050 kWh c. 3520 kWh d. 25200kWh