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A factory worker pushes a crate of mass 30.7 a distance of 4.10 along a level floor at constant velocity by pushing horizontally on it. The coefficient of kinetic friction between the crate and floor is 0.26. What magnitude of force must the worker apply? How much work is done on the crate by this force? How much work is done on the crate by friction?
A piano tuner sounds two strings simultaneously. One has been previously tuned to vibrate at 292.0 Hz. The tuner hears 2.0 beats per second. By what percentage did the tuner increase the tension on that string
Suppose that a plane is flying due west with an airspeed of 222 km/h. What is the magnitude of the wind velocity
An iron wire has a cross-sectional area of 1.14 10-5 m2. Carry out steps (a) through (e) to compute the drift speed of the conduction electrons in the wire, If the wire carries a current of 9.0 A, calculate the drift speed of conduction electrons
A 78-kg base runner begins his slide into second base when he is moving at a speed of 4.2 m/s. The coefficient of friction between his clothes and Earth is 0.70. He slides so that his speed is zero just as he reaches base.
An electron ( charge = -1.6 e^-19 C ) is moving at 3.0 e + 5 m/s in the positive X direction. A magnetic field of 0.8 T is in the positive Z direction. Find the magnetic force on the electron
An electron moves in a region where the magnetic field is uniform, has a magnitude of 60 mT, What is the pitch of the resulting helical path
When monochromatic light shines perpendicularly on a soap film (n = 1.33) with air on each side, What is the vacuum wavelength of the light in nm
A 1.0 kg block of ice is resting at the top of a spherical ball of ice that has a radius of 1.0 meters. At what angle does the block of ice leave the surface of the sphere
Assume that a 6 volt energy source is in a circuit that has a resistance of 10ohms. Determine the current and power
A particle of mass M decays into two identical particles each of mass m, where m = 0.4M. Prior to the decay, the particle of mass M has a total energy of 4 Mc2 in the laboratory reference frame. The velocities of decay product are along the directi..
A 0.954 kg toy car is powered by four AA batteries (6.00 V total) connected directly to a small DC motor. What is the average current supplied to the car's motor
eagan is inspired by performers in the run up of the 2012 london olympics and paralympic games and is determined to
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