A uniform 2.00-kg circular disk of radius 20.0 cm is rotating clockwise about an axis through its center with an angular speed 30.0 revolutions per second
A second uniform 1.50-kg circular disk of radius 15.0 cm that is not rotating is dropped onto the first disk so that the axis of rotation of the first disk passes through the center of the second disk. What is the final angular speed of the two disks when they are rotating together?
A)
16.9 revolutions per second
B)
19.2 revolutions per second
C)
21.1 revolutions per second
D)
17.1 revolutions per second
E)
12.7 revolutions per second
C
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A transformer for a laptop computer converts a 120-V input to a 24-V output. Compared with the number of turns on the primary coil, the secondary has
A) 1/5 as many turns. B) 5 times as many turns. C) the same number of turns. D) none of the above
As sediments accumulate, compaction and cementation produce sedimentary rock. This process is called
A) consolidation. B) solidification. C) lithification. D) solifluction.
A 160 lb person has a mass of 160/32 = 5 slugs. A 160-lb person steps into an elevator and stands on a bathroom scale. Determine the scale reading for the given scenarios. The elevator accelerates downwards and is now moving at a constant speed
a. 150 lb b. 160 lb c. 170 lb d. none of the above