As a basketball player starts to jump for a rebound, he begins to move upward faster and faster until he leaves the floor. During this time that he is in contact with the floor, the force of the floor on his shoes is:
a. bigger than his weight.
b. equal in magnitude and opposite in direction to his weight.
c. less than his weight.
d. zero.
a
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It can be shown that the change in entropy in heating or cooling a sample is given by the relation src="https://sciemce.com/media/4/4efdbe7f0e8622ad72.png" class="w-image" />C?
A. +2.93 J/K
B. +2.50 J/K
C. 0 J/K
D. -2.93 J/K
= mc ln 
where m is the mass of the sample, c is the specific heat of the sample, and 
and
are the final and initial temperatures respectively. What is the change in entropy when 20.0 grams of aluminum with a specific heat of 0.9 J/gm K is heated from 10.0
C 60.0
Camera Exposure: A zoom lens for a camera is adjusted to change its focal length from 38 mm to 304 mm. If the same amount of light is to be admitted to the lens in both cases, what is the final f-number if the original f-number was f/2.0?
Fill in the blank(s) with the appropriate word(s).
Two boxes of the same mass sit on a rough floor. These boxes are made of the same kind of cardboard and are identical except that one is twice as large as the other. If it takes 200 N to start moving the smaller box, how much force does it take to start moving the larger one?
A. Still 200 N B. 400 N C. 800 N D. It depends (specify)
The drag on a blunt object is due primarily to:
(A) The relatively high pressure on the front of the object (B) The wake region (C) The shear stress acting on the front and rear of the object (D) The separated region