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How many photons are emitted each second by an FM radio station whose transmitted power is 200kW and whose frequency is 90.9MHz?
A piece of aluminum has a mass of23 g. If this aluminum were formed into a very thin sheet ofthickness 0.49 mm, find the area of the sheet
question1a two kilogram block is dropped from a height of 0.45m above an incompressible spring. the spring has an
a resistor operated at 100v generates joule heat at a rate of 20w. when placed across a 220v source it will draw a
This observer is 1.03 km away from the antenna. A second observer hovers in a blimp at an altitude of 561 m and measures the radiation intensity from the antenna when she is 1.37 km from the antenna. What intensity, in milliwatts per square meter,..
A 2600kg space vehicle, initially at rest, falls vertically from a height of 3100km above the Earth's surface. Determine how much work is done by the force of gravity in bringing the vehicle to the Earth's surface
A thin film of oil (n = 1.27) is located on smooth, wet pavement. When viewed perpendicular to the pavement, How thick is the oil film
A point charge Q = 5.20e-6 C is at the center of a conducting spherical shell of radius R = 25 centimeter. Find what is the field just outside the shell
A vacuum cleaner belt is looped over a shaft of radius 0.44cm and a wheel of radius 1.50cm. What is the speed of a point on the belt
A golfer imparts a speed of 28.7m/s to a ball, and it travels the maximum possible distance beforelanding on the green. How much time does the ball spend in the air
q1. a person is pulled to the right on a sled total mass of 54.3 kg across the surface of a frozen pond with a force of
A thin stick of mass 400 grams is 2 meters long, and is free to pivot about a point at one end. find the velocity and accelertion of the tip
In Rutherford's famous scattering experiment, α particles (helium nuclei) were fired at 2.0 x 10^7 m/s over a large distance toward a gold nucleus with charge +79e
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