Pressure in a Liquid: The Aswan High Dam on the Nile River in Egypt is 111 m high. What is the gauge pressure in the water at the foot of the dam? The density of water is 1000 kg/m3.
A. 1.09 × 106 Pa
B. 1.16 × 106 Pa
C. 1.09 × 103 Pa
D. 1.11 × 105 Pa
E. 1.11 × 102 Pa
Answer: A
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Mass on a Spring: A 2.0 kg box is traveling at 5.0 m/s on a smooth horizontal surface when it collides with and sticks to a stationary 6.0 kg box. The larger box is attached to an ideal spring of force constant (spring constant) 150 N/m, as shown in the figure. Find (a) the amplitude of the resulting oscillations of this system, (b) the frequency of the oscillations and (c) the period of the oscillations.
What will be an ideal response?
Hydrogen, like electricity, is
A) an energy source. B) not an energy source. C) a source of both thermal and electric power.
A cement truck can pour 160 cubic yards of cement per hour. Express this in ft3/min
a. 480 ft3/min b. 2.67 ft3/min c. 24.0 ft3/min d. 8.00 ft3/min e. 72.0 ft3/min
A barking dog delivers about 1.0 mW of power, which is assumed to be uniformly distributed in all directions. What is the intensity level in decibels at a distance 5.00 m from the dog? The threshold of human hearing is 1.0 × 10-12 W/m2
A) 61 dB B) 63 dB C) 65 dB D) 68 dB