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Suppose that a police car on the highway is moving to the right at 30 m/s, while a speeder is coming up from almost directly behind at a speed of 31 m/s, both speeds being with respect to the ground. The police officer aims a radar gun at the speeder. Assume that the electromagnetic wave emitted by the radar gun has a frequency of 6.00 109 Hz. (a) Find the magnitude of the difference between the frequency of the emitted wave and the wave that returns to the police car after reflecting from the speeder's car. Hz (b) Which wave has the greater frequency? The wave that returns to the police car has the greater frequency. The emitted wave has the greater frequency. Why?
q1.an underwater diver sees the sun 50 degrees above horizontal. how high is the sun above the horizon to a fisherman
Martha travels 25 miles north on her bike. Then, she travels 25 miles due east. What is Martha's displacement
A submarine on the ocean surface receives a sonar echo indicating an underwater object. What is the object's depth
A uniform electric field of about 100 V/m pointing straight down, exists just above Earth's surface. what uniform surface charge density would be required
A railroad car of mass 2.4 104 kg moving at 4.00 m/s collides and couples with two coupled railroad cars, How much kinetic energy is lost in the collision
A solid cylinder of mass 148.7 kg and diameter 0.72m has mounted to rotate around its axis, the cylinder has an initial angular velocity of wi, and the mass is 26m below the cylinder
A solution has a hydronium-ion concentration of 1.0 x 10^-3 mol per liter. What is the hydroxide-ion concentration of this solution
how long is the eagle in the air?
Two people with a combined mass of 115 kg hop into an old car with worn-out shock absorbers. This causes the springs to compress by 8.24 cm. Find the total load supported by the springs
As a baseball is being thrown, it goes from 0.0 to 40.0 m/s in 0.17 s. What is the acceleration of the baseball
A half-wave antenna works on the principle that the optimum length of the antenna is half the wavelength of the radiation being received. What is the optimum length of a car antenna when it receives a signal frequency of 94.7 MHz?
The two charges in the figure above are separated by a distance d = 5.00 cm, and Q = +5.70 nC. Find the electric potential at B
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