A physical pendulum is composed of a disc whose center of gravity is attached to a thin rod. The disc has a moment of inertia of 1?2 MR2. The mass of the disc is 500 gm and has a radius of 4.00 cm. The length of the rod is 50.0 cm. The period of the physical pendulum is
A. 1.24 sec.
B. 1.42 sec.
C. 1.74 sec.
D. 1.90 sec.
E. 2.25 sec.
B. 1.42 sec.
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A rigid body is rotating counterclockwise about a fixed axis. Each of the following pairs of quantities represents an initial angular position and a final angular position of the rigid body. If the object starts from rest at the initial angular position, moves counterclockwise with constant angular acceleration, and arrives at the final angular position with the same angular speed in all three
cases, for which choice is the angular acceleration the highest? 1.3 rad, 6 rad 2.-1 rad, 1 rad 3.1 rad, 5 rad
A thin lens of focal length -12.5 cm has a 5.0 cm tall object placed 10 cm in front of it. Where is the image located?
A. 2.5 cm behind the lens B. 5.6 cm behind the lens C. 5.6 cm in front of the lens D. 50 cm behind the lens E. 50 cm in front of the lens
RMS and Peak Quantities: A 100-W light bulb is powered by 120 V ac 60.0-Hz household connection. Determine the rms current and the current amplitude.
What will be an ideal response?
A supertrain (rest-length = 100 m) travels at a speed of 0.950 c as it passes through a tunnel (rest-length 50.0 m). As seen by a trackside observer, is the train ever completely within the tunnel? If so, by how much?