Two identical objects are placed in a room with a temperature of 20°C. Object A has a temperature of 50°C, while object B has a temperature of 90°C. What is the ratio of the net power emitted by object B to the power emitted by object A?
A) 21 B) 1.7 C) 81 D) 2.8 E) 17
D
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What do we mean by the event horizon of a black hole?
A) It is the boundary within which events in the black hole cannot influence events in the outside universe. B) It is the center of the black hole. C) It is the "bottomless pit" of the black hole. D) It is the place where time begins to slow down as you approach a black hole.
A typical ring particle is about the size of a snowball
Indicate whether the statement is true or false
The weight that will cause a wire of diameter d to stretch a given distance, for a fixed length of wire, is
A) independent of d. B) proportional to d. C) proportional to d2. D) independent of what the length of the wire is.
A charge of 8.0 pC is distributed uniformly on a spherical surface (radius = 2.0 cm), and a second charge of ?3.0 pC is distributed uniformly on a concentric spherical surface (radius = 4.0 cm). Determine the magnitude of the electric field 5.0 cm from the center of the two surfaces
a. 14 N/C b. 11 N/C c. 22 N/C d. 18 N/C e. 40 N/C