In a certain material there is a current of 16 A flowing through a surface to the left, and there is an equal amount of positive and negative charge passing through the surface producing the current. How much negative charge passes through the surface?
a. 16 C/s toward the left
c. 8 C/s toward the right
b. 16 C/s toward the right
d. 8 C/s toward the left
C
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Jogging Jake runs at 4 m/s along a train flatcar that moves at 10 m/s in the opposite direction. Jake's speed relative to the ground is
A) 6 m/s. B) 10 m/s. C) 14 m/s. D) none of the above
Star A and star B both have an apparent magnitude of 4.0, but star A has an absolute magnitude of 1.0 and star B has an absolute magnitude of 7.0. Which statement below is correct?
A) Star A appears brighter than star B, but actually star B and star A are the same brightness. B) Star B appears brighter than star A, but actually star B and star A are the same brightness. C) Star A and star B appear to have the same brightness, but actually star B is brighter than star A. D) Star A and star B appear to have the same brightness, but actually star A is brighter than star B. E) It is impossible to determine how bright these stars are or appear to be relative to one another, given the information above.
How does the theory of planetary migration in disks possibly account for the highly eccentric orbits discovered for some extrasolar planets?
A) A migrating planet would create waves in the planet forming disk, which would in turn lead to the formation of planets on highly elliptical orbits. B) When migrating planets pass close enough for a gravitational encounter, one may be flung from the system while the other is shifted to a highly elliptical orbit. C) When migrating planets collide, they would move onto more eccentric orbits. D) When a planet migrates onto the surface of the star, the additional stellar mass would disrupt the orbits of the remaining planets.
Rita accelerates a 0.50-kg ball from rest to 8.0 m/s during the 0.14 s in which her foot is in contact with the ball. What average force does she apply to the ball during the kick?
a. 110 N b. 22 N c. 29 N d. 56 N e. 2.2 N