The speed of propagation of a transverse wave on a 2.0-m long string fixed at both ends is 200 m/s. Which one of the following is not a resonant frequency of this string?
A) 25 Hz
B) 50 Hz
C) 100 Hz
D) 200 Hz
A
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All the following types of objects are found almost exclusively in the disk (rather than the halo) of the Milky Way except
A) young stars. B) globular clusters. C) X-ray binaries. D) high-mass, red supergiant stars.
Consider two equal mass cylinders rolling with the same translational velocity
The first cylinder (radius = R) is hollow and has a moment of inertia about its rotational axis of M R2, while the second cylinder (radius = r) is solid and has a moment of inertia about its axis of 0.5 M r2. What is the ratio of the hollow cylinder's angular momentum to that of the solid cylinder? A) r2 to 2R2 B) 2R2 to r2 C) r to 2R D) 2R to r E) R to 2r
Refer to diagram of billiard balls F, K, M, and T. Each arrow represents the velocity of the ball. If billiard ball M is traveling straight upward at 2.5 m/sec, then
A. billiard ball F is the slowest of the four. B. billiard ball K has the same velocity as M. C. nothing about their speeds can be said, because they are all moving in different directions. D. billiard ball M must be faster than T.
A solenoid is stretched uniformly to a greater length. If the pre-stretch magnetic field was B, and the length increased 50%, what is the new value for the internal magnetic field in terms of B assuming the current does not change?
1. B/2 2. B 3. 3B/2 4. 2B/3