A catcher arranges to catch a baseball dropped from a height 50 m above his glove. However, his friends substitute a soft 250 g red grapefruit, so that it will smash apart when he catches it. His glove stops the grapefruit in 0.010 s. What force does the glove exert on the grapefruit?
A. 0.078 3 N
B. 783 N
C. 2 450 N
D. 24 500 N
E. 78 300 N
Answer: B
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Two identical loudspeakers that are 5.00 m apart and face toward each other are driven in phase by the same oscillator at a frequency of 875 Hz
The speed of sound in the room is 344 m/s. If you start out standing midway between the speakers, find the shortest distance you can walk toward either speaker in order to hear a minimum of sound. A) 0.0983 m B) 0.197 m C) 0.295 m D) 0.393 m E) 0.590 m
A beam of light of wavelength 600 nm passes through a slit that is 3.1 × 10-5 m wide, and then goes on to a screen that is 2.2 m from the slit. On the screen, how far is the second dark fringe from the center of the diffraction pattern?
A) 3.9 cm B) 4.2 cm C) 6.3 cm D) 2.1 cm E) 8.5 cm
Earth's rotation axis ____________________ slowly so that in a few thousand years Polaris will no longer be the North Star
Fill in the blank(s) with correct word
As a skier gains speed skiing down a slope, ______ energy is being converted to _________ energy
Fill in the blank(s) with correct word