What is the difference between a reflecting and a refracting telescope?
A. Both use a mirror to focus light, but a reflecting telescope uses mirrors elsewhere to bend light.
B. A reflecting telescope uses a lens to focus light; a refracting telescope uses a mirror.
C. A reflecting telescope uses a mirror to focus light; a refracting telescope uses a lens.
D. There is no difference. "Refracting" is an outmoded way of saying "reflecting."
Answer: C
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The surface water temperature on a large, deep lake is 3°C. A sensitive temperature probe is lowered several m into the lake. What temperature will the probe record?
A) a temperature warmer than 3°C B) a temperature less than 3°C C) a temperature equal to 3°C
A ping-pong ball collides with a bowling ball. Which experiences the greatest force?
A. the ping-pong ball B. the bowling ball C. they experience the same force D. the force on each E. the force on each depends on depends on its velocity its mass
Black holes emit radiation in the form of ________ waves known as Hawking radiation.
A. gravitational B. nuclear C. seismic D. electromagnetic
An object is moving with constant velocity. Which of the following statements is true?
A) A constant force is being applied in the direction of motion. B) A constant force is being applied in the direction opposite of motion. C) There are no forces acting on the object. D) The net force on the object is zero. E) There is no frictional force acting on the object.