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Police radars determine speed by measuring the Doppler shift of radio waves reflected by a moving vehicle. The do so by determining the beat frequency between the reflected wave and the 10.5 GHz emitted wave. Some units can be calibrated by using a tuning fork; holding a vibrating fork in front of the unit causes the display to register a speed corresponding to the vibration frequency.A tuning fork is labbled "55 mph". What is the frequency of the tuning fork?
A uniform cylindrical turntable of radius 1.80 m and mass 25.2 kg rotates counterclockwise in a horizontal plane with an initial angular speed of 4pi rad/s. Find the final angular speed of the clay and turntable
How much charge passes through the hair dryer. Find the magnitude of the magnetic field at the center of the square.
If you stand on a bathroom scale, the spring inside the scale compresses 0.80mm , and it tells you your weight is 680N. what does the scale read at its peak
in the rectangle in the drawing a charge is to be placed at the empty corner to make the net force on the charge at
A projectile is fired in such a way that its horizontal range is equal to 12 times its maximum height. What is the angle of projection
A bullet of mass mB = 0.0149 kg is moving with a speed of 102 m/s when it collides with a rod of mass mR = 7.85 kg and length L= 1.08 m, How much kinetic energy is lost in the collision
A bat flies toward a wall, emitting a constant sound of frequency 2.00 rm kHz. This bat hears its own sound plus the sound reflected by the wall.
Four point charges, q, are fixed to the four corners of a square that is 10.3 cm on a side. What is the magnitude of each fixed charge in coulombs
A container at 25°C holds 0.50 moles of helium at a pressure of 2.5 atm. What is the volume of the container
question1a diver 60 m deep in 10 celcius fresh water exhales a 0.5-cm-diameter bubble.what is bubbles diameter just as
a uniform 2.8 magnetic field points to the right a 2.19 m long wire carrying 21.8 a is placed at an angle of 23
A 20.3?kg chandelier is suspended from the ceiling by four vertical steel wires. Each wire has an unloaded length of 1.15m, how far do the wires stretch
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