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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A "GUT" (grand unified theory) refers to theories that
A) unify gravity with the strong and weak forces. B) unify the electromagnetic and weak forces. C) unify all four forces together. D) unify the strong force with the electromagnetic and weak forces.
The current in an electron beam in a cathode-ray tube is measured to be 50 µA. How many electrons hit the screen in 7.0 s? (e = 1.6 × 10^?19 C)
a. 4.4 × 10^11 electrons b. 3.5 × 10^13 electrons c. 2.2 × 10^15 electrons d. 3.1 × 10^18 electrons e. 2.7 × 10^17 electrons
The Moon always keeps the same side facing Earth and therefore Earth always keeps the same side facing the Moon
a. True b. False Indicate whether the statement is true or false
Angular Quantities: At a certain instant, a compact disc is rotating at 210 rpm. What is its angular speed in rad/s?
A. 11 rad/s B. 22 rad/s C. 45 rad/s D. 69 rad/s E. 660 rad/s