If a car has an x-acceleration of ax (t) = ?bt + c, and its initial x-velocity at time t = 0 is vx (0) = v0, which function below best describes vx (t)?
A. ?b
B. ?b + v0
C. 1/2 bt 2 + ct + v0
D. ? 1/2 bt 2 + ct + v0
E. ?2bt 2 + v0
F. ? 1/2 bt 2 + v0
D. ? 1/2 bt 2 + ct + v0
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Electron diffraction shows
a. that electrons behave like waves b. the photoelectric effect c. characteristic x ray spectra d. that electrons in atoms have only certain allowed energies
Air is pumped into a bicycle tire at constant temperature. The pressure increases because:
A. more molecules strike the tire wall per second B. the molecules are larger C. the molecules are farther apart D. each molecule is moving faster E. each molecule has more kinetic energy
Proper time interval is the
A. time kept by the observatory in Greenwich, England B. time measured by any observer with a calibrated clock C. elapsed time between two events measured in a frame of reference in which the two events occur at the same time D. elapsed time between two events measured in a frame of reference in which the two events occur at the same point in space
A buoy, used to mark a harbor channel, consists of a weighted rod 2.00 m in length. 1.50 m of the rod is immersed in water and 0.500 m extends above the surface
If sunlight is incident on the water with an angle of incidence of 40.0°, what is the length of the shadow of the buoy on the level bottom of the harbor?