A ball is thrown straight up into the air. Its position at 7 instants of time are shown in the figure; the maximum height is reached at position 4. At which of the labeled points is the speed of the ball smallest?
4
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Force on a Moving Charge: A proton has an initial velocity to the south but is observed to curve upward as the result of a magnetic field. This magnetic field must have a component
A. to the west. B. to the east. C. upward. D. downward. E. to the north.
Two different samples have the same mass and temperature. Equal quantities of energy are absorbed as heat by each. Their final temperatures may be different because the samples have different:
A. thermal conductivities B. coefficients of expansion C. densities D. volumes E. heat capacities
An object is placed 9.5 cm in front of a convex lens with a focal length of magnitude 24 cm
(a) Where is the image formed and how far is it from the lens? (b) What is the magnification produced by the lens? What will be an ideal response?
Electric voltage is defined as
a)charge transfer per unit time. b)work per unit charge. c)resistance per unit charge. d)work per unit time. ?