If a Ping-Pong ball and a golf ball both move in the same direction with the same amount of kinetic energy, the speed of the Ping-Pong ball must be
A) less than the golf ball.
B) more than the golf ball.
C) both the same
D) need more information
Answer: B
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The magnetic forces exerted on each other by two parallel wires with unequal currents flowing in opposite directions is
A. repulsive and unequal in magnitude. B. attractive and unequal in magnitude. C. repulsive and equal in magnitude. D. attractive and equal in magnitude.
The kinetic energy of an electron in a Bohr orbit of the hydrogen atom is 8.57 × 10-20 J. What is the radius of the orbit?
A) 1.35 × 10-9 m B) 2.01 × 10-9 m C) 2.64 × 10-9 m D) 4.12 × 10-9 m E) 5.29 × 10-11 m
A simple pendulum of length 2.00 m is used to measure the acceleration of gravity at the surface of a distant planet. If the period of such a pendulum is 7.00 s, what is the acceleration of gravity?
A) 7.89 m/s2 B) 6.78 m/s2 C) 1.61 m/s2 D) 0.513 m/s2 E) 17.8 m/s2
For n = 5, how many allowed values are possible for the orbital quantum number and the orbital magnetic quantum number?
a. 5, 11 c. 5, 9 b. 6, 12 d. 4, 9