A solid cylinder of radius R = 1.0 m and mass 10 kg rotates about its axis. When its angular velocity is 10 rad/s, its angular momentum (in kg?m2/s) is
A. 50.
B. 20.
C. 40.
D. 25.
E. 70.
Answer: A
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Although we know less about dark matter in elliptical galaxies than in spiral galaxies, what does current evidence suggest?
A) Elliptical galaxies probably contain about the same proportion of their mass in the form of dark matter as do spiral galaxies. B) Elliptical galaxies probably contain far less dark matter than spiral galaxies. C) Elliptical galaxies probably contain far more dark matter than spiral galaxies. D) Unlike the broad distribution of dark matter in spiral galaxies, elliptical galaxies probably contain dark matter only near their centers.
What is the percent uncertainty in the measurement 2.58 ± 0.15 cm?
A) 2.9% B) 5.8% C) 8.7% D) 12% E) 15%
Which of the following lists the planets of our solar system in the correct order from closest to farthest from the Sun?
A) Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune B) Mercury, Earth, Venus, Mars, Jupiter, Saturn, Neptune, Uranus C) Mercury, Venus, Mars, Earth, Saturn, Jupiter, Neptune, Uranus D) Earth, Mars, Mercury, Venus, Jupiter, Saturn, Uranus, Neptune
A segment of wire carries a current of 25 A along the x axis from x = ?2.0 m to x = 0 and then along the y axis from y = 0 to y = 3.0 m. In this region of space, the magnetic field is equal to 40 mT in the positive z direction. What is the magnitude of the force on this segment of wire?
A. 2.0 N B. 5.0 N C. 1.0 N D. 3.6 N E. 3.0 N