The direction of the force exerted on a moving charge in a magnetic field is
A) in the direction of the motion.
B) opposite its motion.
C) at right angles to the direction of the motion.
Answer: C
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Suppose that Hubble's constant were 11 km/s/million light-years instead of 22 km/s/million light-years. How would this graph look different?
A) The data would follow a much steeper, almost vertical line. B) The data would follow a more shallow line, closer to horizontal than the current line. C) The data would follow a flat, horizontal line. D) The graph would have to show luminosity on the vertical axis, rather than velocity.
What observations suggest the mass of the Galaxy goes much farther out than its visible disc?
A) the rotation curve of the outermost portions of the disc B) 21-cm maps of the spiral arms C) infrared observations of distant brown dwarfs D) the orbits of the open clusters in the disc E) X-ray images of other galaxies' discs from Chandra
Two objects, one less massive than the other, collide elastically and bounce back after the collision. If the two originally had velocities that were equal in size but opposite in direction, then which one will be moving slower after the collision?
a. The less massive one. b. The more massive one. c. The speeds will be the same after the collision. d. There is no way to be sure without the actual masses.
A spherical flask, 4 m diameter with a 5 mm thick wall, is used to heat grape juice. During the heating process the outside surface of the flask is 100ºC and the inside surface is 80ºC. Estimate the thermal resistance of the flask, the heat transfer through the flask, if it is assumed that only the bottom half is heated, and the temperature distribution through the flask wall.
What will be an ideal response?