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A block of mass m is attached to a cord that is wrapped around the rim of a flywheel of radius R and hangs vertically, as shown. If, when the block is released and the cord unwinds, the acceleration of the block is equal to g/4, what is the rotational inertia of the fly wheel?
answer is 3mR^2
A single-turn current loop, carrying a current of 4.82 A, is in the shape of a right triangle with sides 72.8, 121, and 141 cm. The loop is in a uniform magnetic field of magnitude 57.9 mT whose direction is parallel to the current in the 141 cm side..
An electron travels with speed 1.0*10^7 m/s between two parallel charged plates. The plates are separated by 1.0 cm, What is the direction of the magnetic field
A fireman d = 59.0 m away from a burning building directs a stream of water from a ground- level fire hose at an angle of ?i = 29.0° above the horizontal, at what speed will the water strike the building
An elevator is able to raise 9,800 N to a height of 37 m in 12 s, What is the elevator's power output and How much work does the elevator do
A straight rod consists of a 1.2-cm-long piece of aluminum attached to a 2.0-cm-long piece of steel. By how much will the length of this rod change
what is the bullets time in the air. The heat capacity of ice is 2.09 and that of steam is 2.01.
If an isolated conducting sphere 10 cm in radius has a net charge of +7.9 µC, what is the potential on the surface of the sphere
A flat sheet is in the shape of a rectangle with sides of lengths 0.400m and 0.600m. Find the magnitude of the electric flux through the sheet
A room with dimensions 10 x 10 x 20 meters is filled with air at 20 degrees C, 101 kPa and relative humidity 0.8. What is the mass of water vapor in the room, in units of kg
A loudspeaker of mass 22 {rm kg} is suspended a distance of h = 2 {rm m} below the ceiling by two cables that make equal angles with the ceiling. Each cable has the length of l = 3.90 {rm m}.
A cart 4.9 m in length moving with a velocity of 4.9 m/sec is approaching a platform which is 9.8 m above the plane of the cart's motion. how many meters before the front of the cart arrives
The pressure in each of your car tires is 1.90 105 Pa. The mass of your car is 1500 kg. what is the contact area of each tire with the road
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