When you stand at rest on a pair of bathroom scales, the readings on the scales will always
A) each be half your weight.
B) each equal your weight.
C) add to equal your weight.
D) add up to more than your weight.
Answer: C
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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
The glass in a window is 35 inches wide and 20 inches tall, and standard atmospheric pressure is 14.7 pounds per square inch. What net force would result on the glass if the air pressure outside the house were 1% lower than the air pressure inside?
A. 10300 pounds outward B. 103 pounds inward C. There would be no net force D. 103 pounds outward E. 10300 pounds inward
According to quantum theory, the electron in a particular quantum state of the hydrogen atom has
A) a definite position. B) a definite energy. C) a definite velocity. D) All of the above. E) None of the above.
Most of the liquid hydrocarbons on Titan are concentrated in
A) lakes B) surface oceans C) subsurface oceans D) ponds