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.
Jason Fruits/Indiana University Research Communications
Silver/
silver oxide
Zinc
zinc/oxide
Car P moves to the west with constant speed v0 along a straight road. Car Q starts from rest at instant 1, and moves to the west with increasing speed. At instant 5, car Q has speed w0 relative to the road (w0 < v0). Instants 1-5 are separated by equal time intervals. At instant 3, cars P and Q are adjacent to one another (i.e., they have the same position). In the reference frame o f the road, at instant 3 i s the speed o f car Q greater than, less than, or equal to the speed of car P? Explain.
Car P moves to the west with constant speed v0 along a straight road. Car Q starts from rest at instant 1, and moves to the west with increasing speed. At instant 5, car Q has speed w0 relative to the road (w0 < v0). Instants 1-5 are separated by equal time intervals.
Chapter 37 Solutions
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