The force of gravity is an inverse square law. This means that, if you double the distance between two large masses, the gravitational force between them
A) also doubles.
B) strengthens by a factor of 4.
C) weakens by a factor of 4.
D) weakens by a factor of 2.
E) is unaffected.
C
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An ideal fluid in a pipe of diameter 14. cm is moving at 6.0 m/s
(a) If the incompressible fluid density is 1.05 grams/cc, what is the flow rate in kg/s? (b) What is the speed of flow if the pipe narrows to 4.0 cm radius?
A 3.0-kg mass and a 5.0-kg mass hang vertically at the opposite ends of a very light rope that goes over an ideal pulley. If the masses are gently released, what is the resulting acceleration of the masses?
A) 0.00 m/s2 B) 3.7 m/s2 C) 2.5 m/s2 D) 4.9 m/s2 E) 6.1 m/s2
A car is moving along a straight highway and accelerates at a constant rate while going from point A to point B. If the acceleration is positive, increasing the speed of the car, where does the position where the instantaneous speed equals the average speed occur for the interval from A to B?
a. midway between A and B c. closer to B than to A b. closer to A than to B d. Any of the answers could be correct depending on the original speed.
A 10-kg block has twice the density of water. Compared to 10 kg of water, its volume is
1) as much, 2) half as much, 3) twice as much, and when suspended in water its mass will seem to be 4) 0 kg. 5) 3.33 kg. 6) 5 kg. 7) 10 kg. 8) none of these.