What would happen if you broke the glass at the top of the column in this barometer?
a. Nothing, except that the mercury would be exposed to the outside air.
b. The mercury would drop so that the level inside the tube would be equal to that outside the tube.
c. The height of the column would decrease, but it would still be higher than the level in the surrounding dish.
d. The mercury level inside the tube would be much lower than the surrounding mercury liquid because of surface tension.
e. The mercury level inside the tube would be much higher than the surrounding mercury liquid because of surface tension.
b
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Polaris is a second magnitude star, and Phi Pegasi is about 16 times fainter than Polaris. What is the approximate magnitude of Phi Pegasi?
a. 18 b. ?14 c. 3 d. ?3 e. 5
Coulomb's Law: Two point charges, Q1 and Q2, are separated by a distance R. If the magnitudes of both charges are doubled and their separation is also doubled, what happens to the electrical force that each charge exerts on the other one?
A. It increases by a factor of 2.
B. It increases by a factor of 
.
C. It is reduced by a factor of 
.
D. It increases by a factor of 4.
E. It remains the same.
Two balls of different material, but the same radius, ball A and ball B, float on the surface of a pool filled with fresh water of 1000
density. If ball A has 45% of its volume above the water, and ball B has 55% of its volume above the water, what is the ratio of the mass of ball A to that of B?
A. 0.905 B. 1.07 C. None of these D. 1.22 E. 0.82 F. 0.935
The field of view of an image is limited to the half of the visible part of the image
Indicate whether the statement is true or false