On average, how fast do the plates move on Earth?
A) about 1 mile per hour
B) a few kilometers per year
C) a few centimeters per year
D) a few millimeters per century
C
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What do Viking, Pathfinder, and the two Mars Rovers have in common?
A) They all found proof of life on Mars. B) They all could move over the surface of Mars to examine the rocks. C) They all were designed to investigate Mars' potential for life. D) They all are still transmitting data from Mars to Earth. E) They all proved Mars was too inhospitable for life to have every existed there.
Newton's law of gravitational force is expressed as follows:
a. An object with no force on it moves in a straight line with constant velocity. b. An object with a force on it is accelerated in the direction of the force an amount inversely proportional to its mass and directly proportional to the size of the force. c. For every action there is an equal and opposite reaction. d. The force between two objects is directly proportional to the product of their masses and inversely proportional to the distance between them squared.
Observer A is 3.0 m from a tiny light bulb and observer B is 12.0 m from the same bulb. Assume that the light spreads out uniformly and undergoes no significant reflections or absorption
If observer B sees a light of intensity I, the light intensity that A sees is A) I. B) 9I. C) 16I. D) 36I. E) 144I.
A valve is closed and the fluid within a pipe is stationary. When the valve is opened, fluid flows through the pipe. What happens to the pressure in the pipe when the valve is opened?
A) The direction of the pressure change depends on the direction of the fluid flow. B) The direction of the pressure change depends on the density of the fluid. C) The pressure decreases. D) The pressure increases. E) The pressure remains the same.