Measuring Speed by Radar. A baseball coach uses a radar device to measure the speed of an approaching pitched baseball. This device sends out electromagnetic waves with frequency f 0 and then measures the shift in frequency Δ f of the waves reflected from the moving baseball. If the fractional frequency shift produced by a baseball is Δ f / f 0 = 2.86 × 10 −7 , what is the baseball’s speed in km/h? ( Hint: Are the waves Doppler-shifted a second time when reflected off the ball?)
Measuring Speed by Radar. A baseball coach uses a radar device to measure the speed of an approaching pitched baseball. This device sends out electromagnetic waves with frequency f 0 and then measures the shift in frequency Δ f of the waves reflected from the moving baseball. If the fractional frequency shift produced by a baseball is Δ f / f 0 = 2.86 × 10 −7 , what is the baseball’s speed in km/h? ( Hint: Are the waves Doppler-shifted a second time when reflected off the ball?)
Measuring Speed by Radar. A baseball coach uses a radar device to measure the speed of an approaching pitched baseball. This device sends out electromagnetic waves with frequency f0 and then measures the shift in frequency Δf of the waves reflected from the moving baseball. If the fractional frequency shift produced by a baseball is Δf/f0 = 2.86 × 10−7, what is the baseball’s speed in km/h? (Hint: Are the waves Doppler-shifted a second time when reflected off the ball?)
Interaction between an electric field and a magnetic field.
The speed of light in water is 2.30 X 108 m/s. Suppose an electron is moving through water at 2.50 X 108 m/s. Does this particle speed violate the principle of relativity?
Which of the following is NOT related to the contradiction between Maxwell’s theory of electromagnetism and Newton’s laws of mechanics?
A. Maxwell’s theory implies that the speed of light is constant in all inertial frames of reference.
B. Einsteinian relativity proves that ether, which is thought to be the medium of light, does not exist.
C. Newtonian laws show that magnitude of quantities like speed vary according to inertial frames.
D. Galilean transformations predict that light speed in an inertial reference frame would be c’ = c + v.
Compute the kinetic energy of a proton (mass 1.67 * 10-27 kg) using both the nonrelativistic and relativistic expressions, and compute the ratio of the two results (relativistic divided by nonrelativistic) for speeds of (a) 8.00 * 107 m/s and (b) 2.85 * 108 m/s.
Chapter 37 Solutions
University Physics, Volume 2 - Technology Update Custom Edition for Texas A&M - College Station, 2/e
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