A coil with a self-inductance of 6 H has a constant current of 2 A flowing through it for 2 seconds. What is the emf induced in this coil?
A)
6 V
B)
12 V
C)
0 V
D)
4 V
E)
8 V
C
Physics & Space Science
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The watt, W, is equivalent to which of the following?
A. A·V
B. C·J
C. C/J
D. A/V
E. 
Physics & Space Science
As a star exhausts hydrogen in its core, it
a. becomes hotter and more luminous b. becomes hotter and less luminous c. becomes cooler and less luminous d. becomes larger in radius and hotter
Physics & Space Science
Buoyancy: A 50-cm3 block of wood is floating on water, and a 50-cm3 chunk of iron is totally submerged in the water. Which one has the greater buoyant force on it?
A. the wood B. the iron C. Both have the same buoyant force. D. It cannot be determined without knowing their densities.
Physics & Space Science
Which geometrical shape has the least surface area for a given volume?
A) cube B) pyramid C) cylinder D) sphere E) none of the above
Physics & Space Science