A stopping potential of 3.2 V is needed for radiation whose wavelength is 200 nm. What is the work function (in eV) of the material?
a. 4.0
b. 3.0
c. 5.0
d. 6.0
e. 2.0
B
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The Milky Way Galaxy is
a. a spiral galaxy. b. part of a cluster of galaxies that contains a few dozen galaxies. c. about 80,000 light years in diameter. d. all of the above.
A 40.0-kg crate is being lowered by means of a rope. Its downward acceleration is 2.00 m/s2. What is the force exerted by the rope on the crate?
A) 40.0 N B) 80.0 N C) 232 N D) 312 N E) 472 N
Two small cylindrical plastic containers with flat bottoms are placed on a turntable that has a smooth flat surface. Canister A is empty; canister B contains lead shot. Each canister is the same distance r from the center. The coefficient of static friction between the canisters and the turntable is ?s. When the speed of the turntable is gradually increased,
A. only the lighter container slides outward off the turntable; the heavier one stays on. B. only the heavier container slides outward off the turntable; the lighter one stays on. C. both containers slide off the turntable at the same turntable speed. D. the lighter container slides inward. E. the heavier container slides inward.
A speedometer indicates ______________ if the automobile is traveling forward
a. instantaneous acceleration b. instantaneous speed c. instantaneous velocity d. average speed e. average acceleration