What is the resistance of a wire made of a material with a resistivity of 3.2 × 10^-8 W × m if its length is 2.5 m and its diameter is 0.50 mm?
a. 0.16 W
b. 0.10 W
c. 1.28 W
d. 0.41 W
e. 0.81 W
D
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Every second, the Sun converts about 600 million tons of hydrogen into 596 million tons of helium. The remaining 4 million tons of mass is
A) ejected into space in a solar wind. B) ejected into space by solar flares. C) converted to an amount of energy equal to 4 million tons times the speed of light squared. D) reabsorbed as molecular hydrogen.
The linear momentum of a truck will be greater than that of a bus if
a. the truck's mass is larger than the bus's but its speed is the same. b. the truck's speed is larger than the bus's but its mass is the same. c. the truck's mass and speed are both larger than the bus's. d. any of the above.
Doubling the temperature of a black body will double the total energy it radiates
Indicate whether the statement is true or false
Doubling only the spring constant of a vibrating mass-and-spring system produces what effect on the system's mechanical energy?
A) increases the energy by a factor of square root of two B) increases the energy by a factor of two C) increases the energy by a factor of three D) increases he energy by a factor of four E) produces no change