Consider a motorcycle of mass 150. kg, one wheel of which has a mass of 10. kg and a radius of 30. cm
What is the ratio of the rotational kinetic energy of the wheels to the total translational kinetic energy of the bike? Assume the wheels are uniform disks.
0.13 : 1
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Why doesn't the Moon have an atmosphere?
A. The blasts that formed the craters blew it away. B. The Moon's atmosphere was drawn away from it by Earth's stronger gravitational force. C. It had very few volcanoes and the gravity is too weak to hold a substantial atmosphere. D. The solar wind evaporated the Moon's atmosphere.
In the gap between quasars and normal spirals lie
A) Fisher-Tully galaxies. B) Irr II galaxies. C) lobe radio galaxies. D) Seyfert galaxies. E) S0 galaxies.
An electron moves horizontally across the Earth’s equator at a speed of 2.50 × 106 m/s and in a direction 35.08 N of E. At this point, the Earth’s magnetic field has a direction due north, is parallel to the surface, and has a value of 3.00 × 1025 T. What is the force acting on the electron due to its interaction with the Earth’s magnetic field?
1.6.88 × 10-18 N due west 2.6.88 × 10-18 N toward the Earth’s surface 3.9.83 × 10-18 N toward the Earth’s surface 4.9.83 × 10-18 N away from the Earth’s surface 5.4.00 × 10-18 N away from the Earth’s surface
In an elastic collision between two bodies of equal mass, with body 2 initially at rest, body 1 moves off at angle q relative to the direction of its initial velocity and body 2 at angle f. The sine of the sum of q and f, sin(q + f), is equal to
a. 0. b. 0.500. c. 0.707. d. 0.866. e. 1.00.