Two charged bodies separated by a distance d exert an electrical force on each other. The charge on one of the bodies is doubled. The electrical forces on each body now
a. double
b. decrease by 1/2
c. stay the same
d. differ—the force on the other body doubles, but the force on the body whose charge was changed stays the same as before
e. increase by a factor of four
A
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While a rock thrown upward at 50 degrees to the horizontal rises, neglecting air drag, its vertical component of velocity
A) increases. B) remains unchanged. C) decreases.
The center of our galaxy shows signs of past eruptions
Indicate whether the statement is true or false
In the situation shown in figure T2.5c, the width of the bell curve at half its peak value is 0.021U. If we multiply NA, NB, and U by a factor of 100, then the peak’s width (as you can check) is about 0.0021U. Suppose that we increase each solid’s N and the system’s total energy by another factor of 1018 to create solids containing 1/6 of a mole of atoms (still pretty small objects by everyday standards). Assuming that the trend continues, what will be the approximate width of the combined system’s probability bell curve as a fraction of U?
A. 2 × 10-20 B. 2 × 10-22 C. 2 × 10-10 D. 2 × 10-12 E. 2 × 10-40 F. 2 × 10-42 T. Some other factor (specify).
Which phase of the Moon sets at noon?
A. waxing crescent B. full Moon C. third quarter D. new Moon E. None, the Moon always sets at sunrise.