Which of the following is a unit of power?
a. Btu
b. kilowatt
c. kilowatt-hour
d. joule
e. horsepower per hour
b
CHAPTERS 4 AND 5: HEAT
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Double-Slit Interference: An optical engineer needs to ensure that the bright fringes from a double-slit are 15.7 mm apart on a detector that is 1.70 m from the slits. If the slits are illuminated with coherent light of wavelength 633 nm, how far apart should the slits be?
A. 68.5 ?m B. 74.0 ?m C. 79.5 ?m D. 63.0 ?m
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.
A stone is thrown from the top of a building with an initial velocity of 20 m/s downward. The top of the building is 60 m above the ground. How much time elapses between the instant of release and the instant of impact with the ground?
a. 2.0 s b. 6.1 s c. 3.5 s d. 1.6 s e. 1.0 s
The normal force is always equal to the force of gravity
Indicate whether the statement is true or false