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A local AM radio station broadcasts at an energy of 4.04×10-31 kJ/photon.
Calculate the frequency at which it is broadcasting.
Frequency = KHz
(1 KHz = 103 sec -1)
A 17 g bullet is accelerated in a rifle barrel 73.4 cm long to a speed of 493 m/s. Use the work-energy theorem tofind the average force exerted on the bullet while it is being accelerated. Answer in units of N.
IP Suppose a planet is discovered that has the same amount of mass in a given volume as the earth, but has radius 1/6 R Earth. Calculate the acceleration due to gravity on this planed
The picture below shows a model of a human leg with a heavy weight on the ankle. It represents a person lying on his back doing leg-lifts to exercise the quadriceps. What is the magnitude of the gravitational torque
a spring is pressed against a wall so that it is compressed by 0.25 m (ie it is 0.25 m shorter than its equilibrium length). what is the speed at which the spring leaves the wall
A power station uses 100 kV to deliver power to a building. The building has a total resistance of 12.5kV. How much power is delivered to the building
Your task in physics lab is to make a microscope from two lenses. One lens has a focal length of 2 cm, the other a focal length of 1 cm. What will be the magnification of your microscope
A small turtle moves at a speed of 359 furlongs per fortnight. Find the speed of the turtle in centimeters per second. Note that 1 furlong = 220 yards and 1 fortnight = 14 days
imagine that construction crews have set up a pair of blinking lights 60m apart to make a construction zone along a
A miniblack hole formed as a superadvanced civilization decides to punish you (unfairly) by squeezing you until you become so small that you disappear inside your own event horizon. (Assume that your mass is 50).
A wheel rotates about a fixed axis with an initial angular velocity of 25 rad/s. During a 4.0-s interval the angular velocity decreases to 10 rad/s. How many radians does the wheel turn
A meter stick is initially at rest in a horizontal position. It is free to rotate about the 50 centimeter point. Obtain the magnitude of the total torque on meter stick
A circular disk has surface charge density 8.0nC/cm^2. What will the surface charge density be if the radius of the disk is doubled? Express your answer to two significant figures and include the appropriate units.
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