1.8 ?F and 3.6 ?F capacitors are connected in series and then charged by a 24. volt battery. The battery and capacitors are disconnected and the capacitors reconnected in parallel (plus to plus, minus to minus)
(a) What charge initially flowed from the battery to the series combination?
(b) What total charge is on the final positive plates?
(c) What final voltage is across the parallel combination?
(a) 29. ?C
(b) 58. ?C
(c) 11. volts
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Sally places an object 6.0 cm from a thin, convex lens along its axis. The lens has a focal length of 12 cm. What are the respective values of the image distance and magnification?
a. 12 cm and -2.0 c. 3.0 cm and -0.50 b. –12 cm and 2.0 d. -6.0 cm and -1.0
One ray that is useful in locating the image formed by a convex mirror is the ray that is incident on the mirror in a path directed toward the focal point. This ray is reflected
A. through the center of curvature. B. directly back along its incident path. C. on a path tangent to the mirror. D. on a path parallel to the mirror axis.
By studying distant galaxies in the 1920s, Hubble made the following important discovery that led us to conclude that the universe is expanding
A) All galaxies contain billions of stars, and all galaxies have spiral shapes. B) All galaxies outside the Local Group are moving away from us, and the farther away they are, the faster they're going. C) All galaxies were born at the same time, and all will die at the same time. D) All galaxies outside the Local Group are orbiting the Local Group. E) All galaxies outside the Local Group are moving away from us, and all are moving away at nearly the same speed.
A transverse periodic wave is represented by the equation z(y, t) = 1.50 cm sin(1,250 rad/s t + 10.0
What is the direction of the vibration of the wave?
A. the x direction B. the y direction C. the z direction