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Two 57.5 kW radio stations broadcast at different frequencies. Station A broadcasts at a frequency of 892 kHz and station B broadcasts at a frequency of 1410 kHz. Which stations emits more photons per second? Explain. Which station emits photons of higher energy?
A cord is wrapped around the rim of a solid uniform wheel 0.300 in radius and of mass 7.80 . A steady horizontal pull of 40.0 to the right is exerted on cord, pulling it off tangentially from the wheel. The wheel is mounted on frictionless bearing..
an astronaut on the moon fires a projectile from a launcher on a level surface so as to get the maximum range. if the
Suppose one gallon of gasoline produces 1.1 x 108 J of energy, and this energy is sufficient to operate a car for twenty miles. If a 504 mg drop of gasoline could be converted completely into thermal energy, how many miles could the car go with that ..
The electromagnetic wave that delivers a cellular phone call to a car has a magnetic field with an rms value of 2.3 × 10-10 T. How much energy does this wave carry through the window during a 46-s phone call
an aluminum wire having a cross-sectional area equal to 5.30 10-6 m2 carries a current of 7.00 a. the density of
A cylinder of mass 8.0 kg rolls without slipping on a horizontal surface. At a certain instant its center of mass has a speed of 11.0 m/s. Determine the translational kinetic energy of its center of mass
a segment of wire carries a current of 25 a along the x axis from x -2.0 m to x 0 and then along the z axis from z0 to
A 60-N toolbox is dragged horizontally at constant speed by a rope making an angle of 35° with the floor. Determine the magnitude of the normal force
An engine develops 490 N m of torque at 3750 rev/min. Find the power developed by the engine
A single mass m1 = 4.2 kg hangs from a spring in a motionless elevator. The spring is extended x = 13.0 cm from its unstretched length. What is the distance the upper spring is extended from its unstretched length
a cube of wood floating in water supports a 200g mass at the centre of its top face. when the mass is removed, the cube rises by 2cm. determine the volume of the cube
Two Stars of equal mass revolve in a circular orbit about a center of mass midway between them. Find the mass of each star
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