You toss a ball to a friend. When the ball reaches its maximum altitude, its acceleration
A) changes sign.
B) is zero.
C) is constant.
D) is g/2.
E) is 2*g.
C
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What evidence suggests that the protogalactic cloud that formed the Milky Way resulted from several collisions among smaller clouds?
A) The stars in the halo of the Milky Way are organized into several dense clusters arranged throughout the halo. B) The Milky Way resembles an elliptical galaxy more than other spirals do. C) Halo stars differ in age and heavy-element content, but these variations do not seem to depend on the stars' distance from the galactic center. D) The bulge of the Milky Way is surrounded by many globular clusters, just as elliptical galaxies are. E) The Milky Way is the central galaxy of a cluster of galaxies.
A 15-?F capacitor and a 30-?F capacitor are connected in series, and charged to a potential difference of 50 V. What is the resulting charge on the 30-?F capacitor?
A. 0.70 mC B. 0.80 mC C. 0.50 mC D. 0.60 mC E. 0.40 mC
In a Compton scattering experiment, what scattering angle produces the greatest change in wavelength?
A) 0° B) 45° C) 90° D) 180° E) none of the given answers
Lenz's Law: As shown in the figure, a battery supplies a steady current to the solenoid on the left. The two solenoids are moving toward each other with speeds v. The direction of the induced current through the resistor R is
A. from a to b. B. from b to a. C. No current is induced.