A disk-shaped space station 125 m in diameter spins at a uniform rate about an axis through its center and perpendicular to the plane of the disk
If the acceleration of a point on the rim of the disk is to be equal to g, how long does it take for the station to make one revolution? Use g = 9.8 m/s2.
16 s
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A 22-A current flows into a parallel combination of 4.0-?, 6.0-?, and 12-? resistors. What current flows through the 12-? resistor?
A) 18 A B) 11 A C) 7.3 A D) 3.7 A
The colors of objects we see by reflected light are due to
a. interference c. specular reflection b. selective absorption d. diffuse reflection
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A 0.10-kg ball, traveling horizontally at 25 m/s, strikes a wall and rebounds at 19 m/s. What is the magnitude of the change in the momentum of the ball during the rebound?
A) 72 kg ? m/s B) 4.4 kg ? m/s C) 1.8 kg ? m/s D) 5.4 kg ? m/s E) 1.2 kg ? m/s