The symbol indicating the number of protons in a nucleus is __________
Fill in the blank(s) with correct word
Z
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A ball bearing rolls along a smooth horizontal tabletop, and crashes head-on into a second ball bearing of half its mass. If both ball bearings roll in the x-direction only (either positive or negative) and the initially stationary ball bearing is observed to have a velocity of +2.4 m/s after the collision, what was the initial speed of the first ball bearing?
A. More information is required B. 7.2 m/s C. 3.6 m/s D. 1.8 m/s
Star A and star B have the same temperature, but star A is 5 times bigger than star B. Which statement below is correct?
A) Star A is redder and dimmer than star B. B) Star A is bluer and dimmer than star B. C) Star A is redder and brighter than star B. D) Star A is bluer and brighter than star B. E) Star A and star B have the same color, but star A is brighter.
Three equal positive charges are placed on the x-axis, one at the origin, one at x = 2 m, and the third at x = 4 m. Of the following points, which has the greatest magnitude electric field?
a. x = 1 m b. x = 3 m c. x = 5 m d. The electric field has the same magnitude at all three positions.
A camera has a converging lens with a focal length of 56 mm. If the f-number is 2.8, what is the diameter of the lens (in mm)?
a. 10 b. 31 c. 0.50 d. 20 e. 50