Gravity follows an inverse square law. This means that if the distance between two masses is decreased by a factor of 4, the gravitational force between those two masses
A) increases by a factor of 16.
B) increases by a factor of 4.
C) increases by a factor of 2.
D) decreases by a factor of 4.
E) decreases by a factor of 16.
A) increases by a factor of 16.
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The point P lies along the perpendicular bisector of the line connecting two long straight wires S and T perpendicular to the page. A set of directions A through H is shown next to the diagram. When the two equal currents in the wires are directed into the page, the direction of the magnetic field at P is closest to the direction of
A. A B. B. C. C. D. D. E. E.
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What generally causes clouds to form?
A) falling relative humidity B) sinking of saturated air C) lifting of air D) addition of water vapor