A buoy, used to mark a harbor channel, consists of a weighted rod 2.00 m in length. 1.50 m of the rod is immersed in water and 0.500 m extends above the surface
If sunlight is incident on the water with an angle of incidence of 40.0°, what is the length of the shadow of the buoy on the level bottom of the harbor?
0.828 m
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It is desired to study the radiation heat loss (or gain) from the surface of an automobile engine. Assume that the engine is a gray opaque convex surface radiating with a heat exchanger for cooling engine coolant (called a radiator) on one side. Assume that the radiator is also a gray opaque flat surface. The engine also radiates with the road surface underneath (a black body), the hood and fender wells (assume these are one reradiating surface) and the firewall (a black body). Construct a circuit to describe these processes and identify all of the radiosities, black body emitters ( Ebi), and resistances in terms of the emissivities, areas, and shape factors.
According to the universal law of gravitation, if the masses of both attracting objects double, then the gravitational force between them will
A) not change at all. B) increase by a factor of 2. C) decrease by a factor of 2. D) increase by a factor of 4. E) decrease by a factor of 4.
Three point charges are located on the x-axis. The first charge, 
is at x = -1.00 m; the second charge,
is at the origin; and the third charge, 
is located at x = 2.00 m. Which charge is subjected to the force of greatest magnitude?
A. 
B. 
C. 
D. 
E. 
White light hitting white paper is an example of
A) absorption. B) transmission. C) reflection or scattering. D) emission.