A person looks horizontally at the edge of a swimming pool. If its length is 5 m, and the pool is filled to the surface, to what depth (in m) could the observer see? (n for water is 1.33)
a. 3.2
b. 4.4
c. 2.1
d. 1.0
e. 0.3
B
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An object attached to a spring is pulled across a horizontal frictionless surface. If the force constant (spring constant) of the spring is 45 N/m and the spring is stretched by 0.88 m when the object is accelerating at
what is the mass of the object? A) 28 kg B) 24 kg C) 31 kg D) 36 kg
An object that is positively charged will
a. repel a rubber rod stroked with fur. b. repel a glass rod stroked with silk. c. be polarized. d. none of these
In latitudes where the subsurface layer of soil always remains frozen, the frozen layer is called
a. an aquifer. b. the frost table. c. a glacier. d. permafrost.
A resistor, inductor, and capacitor are connected in series, each with an effective (rms) voltage of 65 V, 140 V, and 90 V, respectively. What is the magnitude of the phase angle between the current and applied voltage phasors in this circuit?
a. 38° c. 22° b. 28° d. 43°