Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t. The quantity Fd is
a. the kinetic energy of the crate
b. the potential energy of the crate
c. the linear momentum of the crate
d. the work you do on the crate
e. the power you supply to the crate
D
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Suppose you want to set up a simple pendulum with a period of 2.50 s. How long should it be
(a) on Earth, at a location where g = 9.80 m/s2? (b) on a planet where g is 5.00 times what it is on Earth? What will be an ideal response?
An observer is moving in space toward a distant star at 200 km/s while the star is moving toward the observer at 400 km/s; the relative velocity being 600 km/s of approach. What relative change in frequency of the light from the star as seen by the observer? (The speed of light in space is 3.00 × 10^5 km/s)
a. 0.067% increase c. 0.20% increase b. 0.20% decrease d. 0.033% decrease
If the speed of an electron increases, its de Broglie wavelength
a. increases. b. decreases. c. stays the same. d. may increase or decrease.
A rifle is aimed horizontally toward the center of a target 120 m away. If the bullet strikes 11.2 cm below the center, what was the velocity of the bullet? (Ignore air friction.)
a. 23 m/s b. 1 120 m/s c. 32 m/s d. 790 m/s e. 400 m/s