An alpha particle (charge = +2e) is sent at high speed toward a gold nucleus (charge +79e). What is the electrical force acting on the alpha particle when it is at a distance of 2 × 10^?14 m away from the gold nucleus? (e = 1.6 × 10^?19 C)
91 N
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Air becomes saturated when its temperature
A) falls to a point where water vapor molecules evaporate. B) rises to a point where water vapor molecules condense. C) rises to a point where water vapor molecules evaporate. D) falls to a point where water vapor molecules condense.
An object 2.0 cm tall is placed 24. cm in front of a convex mirror whose focal length is 30. cm
(a) Where is the image formed? (b) How tall is it?
Which laboratory observation would most support the kinetic theory's assumption that molecules in a gas are widely separated?
a. A gas exerts the same pressure on each part of a container's wall. b. A gas is highly compressible. c. A gas with a lower formula mass diffuses more rapidly than one with a higher formula mass. d. A gas expands when the pressure on it is released.
A car accelerates from rest to 30 km/h. Later, on a highway it accelerates from 30 km/h to 60 km/h. Which takes more energy, going from 0 to 30, or from 30 to 60?
(a) 0 to 30 km/h. (b) 30 to 60 km/h. (c) Both are the same.