The potential energy of a pendulum is least
a. when its potential energy is greatest.
b. at the top of its swing.
c. at the bottom of its swing.
d. when its total energy is greatest.
c
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A coil of 150 turns of wire is in the form of a circle of diameter 7.5 cm, and sits in the center of a dipole magnet that produces a uniform magnetic field of strength 1.5 T. The torque on the coil has a maximum value of 0.25 Nm. What is the current in the coils?
A. 9.4 A B. 200 mA C. 4.7 mA D. 63 mA E. 94 mA
Impulse: A golf ball of mass 0.050 kg is at rest on the tee. Just after being struck, it has a velocity of 102 m/s. If the club and ball were in contact for 0.81 ms, what is the average force exerted on the ball by the club?
A. 6.3 kN B. 7.1 kN C. 5.5 kN D. 4.9 kN
It can be shown that the approximate age of the universe is 1/H, where H is the Hubble constant. Taking H = 20 km/s/Mly, estimate the age of the universe, in years
A) 1500 years B) 15 thousand years C) 15 million years D) 15 billion years E) 15 trillion years
On a prescription for eyeglass lenses, what does the quantity expressed in diopters refer to?
a. The thickness of eyeglass lenses. b. The limitations of the person's eyes. c. The width of the eyeglass lens. d. The strength of eyeglass lenses. e. The curvature of eyeglass lenses.