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A source of electromagnetic waves radiates power uniformly in all directions at a single frequency. At a distance of 7.00 km from the source, a detector measures the intensity of the wave to be 27.0 µW/m2. What is the peak value of the magnetic field at the detector due to the wave?
What is the average power radiated by the source?
Now the detector is replaced with a perfectly absorbing sheet normal to the incident flux, with surface area 2.00 m2. What is the force on the sheet due to the wave?
You and a close friend stand facing each other. You are as close as you can get without actually touching. If a wire is attached to each of you, estimate the capacitance of this "human capacitor
A ball is held on an incline at the height of 72 cm. it is then released so that the ball rolls down the incline. At the bottom of the incline there is a loop where the ball rolls around in. If the loop is 62 cm high at its highest point what is the ..
A cart for hauling ore out of a gold mine has a mass of 447 kg, including its load. Calculate the work done on the cart during the process by friction
Billy Dee notes that her favorite record rotates at 34 rev/min. At what speed does the point on the record touching the stylus (needle) move when the stylus (needle) is 5.9 cm from the center?
Two capacitors are connected in parallel across the terminals of a battery. One has a capacitance of 2.0 µF, What is the voltage of the battery
A current flow in a circle loop is clockwise. What is the magnetic field at the center of the loop point
A proton is initially at rest at a point where the potential is 507V. Sometime later the proton is at a point where the potential is 187V. If no force other than the electrostatic force acts on the proton, what is its final kinetic energy.
a solid aluminum ingot weighs 89n in the air. the ignot is suspended from a rope and totally immersed inn water. what is the tension in the rope
A major-league catcher gloves a 92 {rm mi}/{rm h} pitch and brings it to rest in 0.15 {rm m}.If the force exerted by the catcher is 803 {rm N}, what is the mass of ball.
Your friend's car is broken and you volunteer to push it to the nearest repair shop which is 2.0 km away. what is the normal force between the two bumpers
Visible light passes through a diffraction grating that has 900 slits per centimeter, What is the difference between these wavelengths
Two small spheres, each with mass m = 3.1 g and charge q, are suspended from a point by threads of length L = 0.23 m
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