An astronaut in a space capsule is experiencing "weightlessness." Does the astronaut have to exert any effort to throw a bowling ball, since the bowling ball is also weightless?
What will be an ideal response?
Yes. The ball will undergo an acceleration, and the force required to give it this acceleration is equal to the mass of the ball times the acceleration.
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Which of the following statements best describes the two principal advantages of telescopes over eyes?
A) Telescopes can collect far more light with far better angular resolution. B) Telescopes can collect far more light with far greater magnification. C) Telescopes have much more magnification and better angular resolution. D) Telescopes collect more light and are unaffected by twinkling. E) Telescopes can see farther without image distortion and can record more accurate colors.
Seventy five percent of Earth's surface is covered by _______________
Fill in the blank(s) with correct word
Which wavelengths are shortest?
A) light ray B) X-ray C) gamma ray
A ball tossed vertically upward reaches its highest point and then falls back to its starting point. During this up-and-down motion the acceleration of the ball is always
A) in the direction of motion. B) opposite its velocity. C) directed upward. D) directed downward.