If a planet has a radius 20% greater than that of the Earth but has the same mass as the Earth, what is the acceleration due to gravity at its surface?
a. 14 m/s2
c. 8.1 m/s2
b. 12 m/s2
d. 6.8 m/s2
D
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When a cube is inscribed in a sphere of radius r, the length L of a side of the cube is 
. If a positive point charge Q is placed at the center of the spherical surface, the ratio of the electric flux ?sphere at the spherical surface to the flux ?cube at the surface of the cube is
A.
.B.
.C.
D.
.E.
.The heat of vaporization of ethyl alcohol Lv is about 200 cal/g. That means that 1 gram of this refrigerant upon vaporization would release
A) less then 200 calories. B) 200 calories. C) more than 200 calories.
Determine the total frozen fraction after 60 minutes of cooling if the tubes are in a staggered arrangement instead of the in-line arrangement.
What will be an ideal response?
The difference between a LED and a laser is that a LED has spontaneous photon emission, and a laser has _________photon emission.
Fill in the blank(s) with the appropriate word(s).