A pendulum consists of a mass m suspended from a string of length L. When the pendulum is swinging, how much greater is the mass's potential energy when the string is displaced from the vertical by the angle ? than when the mass is at the lowest position?
a. mgLsin?
b. mgLcos?
c. mgL(1 – sin?) d. mgL(1 – cos?)
d
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By what amount does the intensity level increase when you triple the intensity of a source of sound?
A) 9.5 dB B) 4.8 dB C) 6.0 dB D) 3.0 dB E) 12 dB
A concrete wall of a cold storage room measures 3.0 m high, 5.0 m wide, and 20 cm thick. The inside wall is to be covered by a layer of wood in order to reduce the rate of thermal energy flow through the wall by 90 percent
The inner surface of the wooden wall is maintained at -10°C and the outer surface of the concrete wall is at 20°C. The thermal conductivities of concrete and wood are 0.80 W/m ? K (concrete) and 0.040 W/m ? K (wood). What is the temperature difference across the layer of wood? A) 24 C° B) 25 C° C) 26 C° D) 27 C° E) 28 C°
The quantity "pressure" expressed in terms of the fundamental quantities (mass, length, time) is equivalent to
a. MLT?1. b. ML?1T?2. c. M2L?1T?3. d. a dimensionless quantity.
The photoreceptors responsible for "twilight" vision are called
a. rods. b. cylinders. c. cones. d. cans.