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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Comparing the speed of sound in liquids, gases, and solids, the speed of sound is usually lowest in ____ and highest in ____
a. solids, liquids b. gases, liquids c. liquids, solids d. gases, solids
The following conversion equivalents are given:
1.0 mile = 5280 ft 1.0 ft = 12 in 1 m = 39.37 in 1.0 hour = 60 min 1.0 min = 60 s If a deer runs at 4.7 mi/h, its speed, in meters per second, is closest to A) 2.1 m/s. B) 1.7 m/s. C) 1.9 m/s. D) 2.3 m/s. E) 2.5 m/s.
If you feel a centrifugal force pulling you to the outside of a rotating circular wall:
a. you are correct about what is happening. b. the circular wall actually is pushing on you. c. you are experiencing a linear force. d. the centripetal force inward balances the centrifugal force outward, and you feel no net force. e. you are only experiencing half of what is happening; you are being pulled to the outside of the circle and the outside of the circle is also pushing on you.
Electromagnetic radiation has the properties of
A) waves only B) particles only C) neither waves or particles D) both waves and particles