The force of gravity varies with the
A) product of the two masses.
B) inverse of the distance separating the two bodies.
C) inverse square of the distance separating the two bodies.
D) Both A and B are correct.
E) Both A and C are correct.
E
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What do astronomers mean when they say the universe is expanding?
A) Everything in the universe is gradually growing in size. B) Average distances are increasing between most galaxies. C) Average distances are increasing between most stars. D) The universe is expanding from a single point.
A galvanometer has an internal resistance of 100 ? and deflects full-scale at a current of 2.00 mA
What size resistor should be added to it to convert it to a millivoltmeter capable of reading up to 400 mV, and how should this resistor be connected to the galvanometer? A) 50.0 ? in series with the galvanometer B) 50.0 ? in parallel with the galvanometer C) 75.0 ? in parallel with the galvanometer D) 100 ? in series with the galvanometer E) 100 ? in parallel with the galvanometer
Iridium was the element that first alerted us to the unusual dust left behind by the K-T boundary event
Indicate whether the statement is true or false
Vector V1 is (5i + 7j - 3k) and V2 = (7i + 2 j + 14k). The scalar product of these two vectors is:
(A) 7.0 (B) -5.8 (C) 2.5 (D) 3.4