The buoyant force of an object is equal to the ______________ of the ______________ it displaces
a. mass; fluid
b. weight; fluid
c. mass; solid
d. weight; solid
b
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The amount of gravitational potential energy released as an object falls depends on
A) its mass, the distance it falls, and the acceleration of gravity. B) its mass and its speed at the time it begins falling. C) its mass and its speed when it hits the ground. D) only its mass and the acceleration of gravity. E) only the acceleration of gravity.
Assuming a pupil diameter of 3. mm, what is the angular resolution of the human eye at the middle of the visible spectrum (550. nm)?
A) 0.8 degree B) 0.8 arc-minute C) 0.2 degree D) 0.2 arc-minute E) 2. milliradian
Suppose that the build-up of fatty tissue on the wall of an artery decreased the radius by 10%. By what percent would the arterial pressure difference produced by the heart have to be increased to maintain a constant blood flow?
A) 48% B) 52% C) 50% D) 46% E) 54%
Blue light will not eject electrons from a certain metal; however, which one of the following may possibly eject electrons from that metal?
a. infrared b. ultraviolet c. red d. green