A car traveling at 3.0 m/s has a constant acceleration of 4.0 m/s2 . After 2.0 seconds, the velocity is
A. 5.0 m/s.
B. 7.0 m/s.
C. 9.0 m/s.
D. 11 m/s.
E. 13 m/s.
D. 11 m/s.
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The Doppler shift applies only to the line spectrum. It does not apply to the continuous (blackbody) spectrum.
Answer the following statement true (T) or false (F)
Consider a monkey wrench released at rest at the far edge of the solar system. Suppose that it drops to Earth by virtue of only Earth gravity. It will strike Earth's surface with a speed of about
A) 10 m/s. B) 8 km/s. C) 11.2 km/s. D) the speed of light.
A boy kicks a football with a certain initial velocity at an angle 20° above the horizontal. In 2.0 seconds, the ball reaches at its highest point in its trajectory. What is the initial velocity of the ball?
A) 9.8 m/s B) 20 m/s C) 57 m/s D) 4.9 m/s E) 29 m/s
Doubling the mass per unit length of a guitar string will result in changing the wave speed in the string by what factor?
a. 1.41 c. 0.71 b. 1.00 (i.e., no change) d. 2.00