The gravitational force between two metal spheres in outer space is 1800 N. How large would the force be if the two spheres were twice as far apart?
A. 7200 N
B. 3600 N
C. 900 N
D. 450 N
Ans: D. 450 N
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Energy Conservation With Conservative Forces: A stone is released from rest at a height h at the left side of a loop-the-loop, as shown in the figure. There is no appreciable friction from the track or from air resistance. If the radius of the loop is R, what is the minimum height h for which the stone will not fall off the track at the top of the loop?
A. 3.5 R
B. 2.5 R
C. 2.0 R
D. 
R
E. 3.0 R
Ohm's Law: The figure shows electrons passing through a resistor. The arrow shows the direction in which the electrons are moving. Which of the following statements are correct? (There could be more than one correct choice.)
A. The electrons are moving slower at point b than at point a. B. The electric potential is higher at point b than at point a. C. The electric potential is lower at point b than at point a. D. The electrons are losing electric potential energy as they move through the resistor from a to b. E. The speed of the electrons at point b is the same as it is at point a.
The thickness of the disk of the Milky Way is about ________ the diameter of the disk.
A) 1/10th of B) 1/1000th of C) 1/1,000,000th of D) the same as
The intensity at a distance of 6.0 m from a source is 6 × 10-10 W/m2
(a) What is the power level emitted by the source? (b) What is the intensity level in dB?