Moment of Inertia: A potter's wheel has the shape of a solid uniform disk of mass 7.0 kg and radius 0.65 m. It spins about an axis perpendicular to the disk at its center. A small 2.1 kg lump of very dense clay is dropped onto the wheel at a distance 0.41 m from the axis. What is the moment of inertia of the system about the axis of spin?
A. 1.8 kg ? m2
B. 1.5 kg ? m2
C. 0.40 kg ? m2
D. 2.5 kg ? m2
Answer: A
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The cosmic background radiation has a low temperature today because
A. it has gotten so far from the Sun. B. it was created with a low temperature. C. the Universe has expanded, and expansion causes cooling. D. all the stars that were heating it have burned out. E. it is rich in heavy elements that absorb radiation very strongly.
How fast must a meter stick move, relative to the frame of the observer making the measurement, so its length will be measured to be 0.60 m?
A) 0.40c B) 0.90c C) 0.70c D) 0.80c E) 0.60c
The speed of sound in air is a function of which one of the following?
a. wavelength c. temperature b. frequency d. amplitude
Two particles move into a magnetic field. They enter moving at the same speed and direction. The magnitude of the charge on each is known to be the same. One particle curls to the right and the other to the left upon entering the field, the leftward moving particle moves in a larger circle than the rightward moving particle. From this we can say that
A. the leftward moving particle has more mass and is positively charged. B. the leftward moving particle has more mass and its charge is opposite the other particle. C. the rightward moving particle has less mass and is positively charged. D. the rightward moving particle has positive charge but we cannot say anything about its mass.