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In one of the original Doppler experiments a tuba was played on a moving flat train car at a frequency of 75 hz and a second identical tuba played the same tone while at rest in the railway station. What beat frequency was heard if the train car approached the station at a soeed of 10m/s.
A uniform stick of length L = 1.8 m, width W = 10.0 cm, and mass M = 4.8 kg oscillates as a physical pendulum, Calculate the minimum value of the period of the pendulum
A portable electric heater uses 22 A of current. The manufacturer recommends that an extension cord attached to the heater, What is the smallest radius of copper wire that can be used in the extension cord
A 525-? resistor, an uncharged 1.50-µF capacitor, and a battery with an emf of 6.31 V are connected in series, What is the current after one time constant
Two crickets, Chirpy and Milada, jump from the top of a vertical cliff. Chirpy just drops and reaches the ground in 4.00s, How far from the base of the cliff will Milada hit the ground
An Indy car with a speed of 120km/h goes around a level, circular track with a radius of 1km. What is centripetal acceleration of the car.
A 1.3 m length of wire carrying 5.9 A of current toward the south is oriented horizontally. Estimate the magnitude of the magnetic force on the wire due to the Earth's magnetic field of 5.5 ? 10-5 T at this point
A Mercedes-Benz 300SL (m = 1700 kg) is parked on a road that rises 20° above the horizontal. What is the magnitude of the normal force
Express your answers using two significant figures. Enter the x and y coordinates of the charge separated by a comma.
a ball (mass=m) moving in the positive x direction with speed v collides with a block (mass=M) initially at rest, compute the mass of the block
To focus a camera on objects at different distances, the converging lens is moved toward or away from the film, Over what distance must the lens be movable
A turbine that uses steam drives an electric generator. The inlet stream flows through a 10 cm diameter pipe to the turbine at 2.5 kg/s at 600°C and 1000 kPa. The exit steam discharges through at 25 cm diameter pipe at 400°C
A 10-kg box is at rest on a horizontal frictionless surface, at the end of an unstretched horizontal spring with constant k=4000 N/m, What is the speed of the box when it passes back through the equilibrium point
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