Impulse: A batter hits a 0.140-kg baseball that was approaching him at 30 m/s and, as a result, the ball leaves the bat at 40 m/s in the reverse of its original direction. The ball remains in contact with the bat for 2.0 ms. What is the magnitude of the average force exerted by the bat on the ball?
Fill in the blank(s) with the appropriate word(s).
4900 N
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a. is a Herbig-Haro object. b. is a reflection nebula of dust. c. is an emission nebula of thin gas. d. contains only young low mass stars. e. is believed to be about 5 billion years old.
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What will be an ideal response?
The variation in the pressure of helium gas, measured from its equilibrium value, is given by ?P = 2.9 × 10^?5 cos (6.20x ? 3 000t) where x and t have units m and s, and ?P is measured in N/m2 . Determine the wavelength (in m) of the wave
a. 1 500 b. 0.32 c. 477 d. 1.01 e. 0.50
A physics professor pushes against a stationary wall, "working" up a sweat. Is he doing any actual physical work on the wall?
A) No--it's a law of nature that physics profs never do any actual work. B) No, because the force by his hands against the wall is balanced by the force by the wall pushing back. C) Yes, because he is exerting a force against the wall during a period of time. D) No, because the wall is not moving. E) Yes, because his arm muscles are moving other muscles through a distance.