The fraction of incident light that a body reflects is called its ______________
Fill in the blank(s) with correct word
albedo
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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 heat 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 should be the thickness of the layer of wood? A) 100 mm B) 90 mm C) 60 mm D) 70 mm E) 80 mm
The phase angle of an LRC series circuit with a capacitive reactance of 40 ?, a resistor of 100 ? and a certain inductor at 1000 Hz is 40.0°. What is the value of the inductance in this circuit?
A) 11.8 mH B) 124 mH C) 212 mH D) 61.9 mH E) 19.7 mH
An electromagnetic wave with a peak magnetic field component of 3.20 × 10^?7 T carries what average power per unit area? (?0 = 4? × 10^?7 T?m/A, ?0 = 8.85 × 10^?12 C2/N?m2 and c = 3.00 × 10^8 m/s)
a. 38.4 W/m2 b. 24.4 W/m2 c. 12.2 W/m2 d. 3.82 W/m2 e. 7.64 W/m2
Triple the mass of the bob on a simple pendulum will cause a change in the frequency of the pendulum swing by what factor?
a. 1/3 b. 1 c. 32 d. 3 e. 1/32