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A 10 kilogram lead ball is dropped from a height of 30 m and it hits the floor at a speed of 20 m/s. Suppose the ball is released from rest. Find how much mechanical energy is lost to air resistance?
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A hammer is hung from a small hole in its handle, swung slowly to an angle of theta max = 0.1 radians and then released. Find the net torque on the hammer
A physics student is standing on an initially motionless,frictionless turntable with rotational inertia 0.31kg·m2. He's holding a wheel of rotational inertia0.22 kg·m2 spining at 135 rpm about a vertical axis,
In the hydrogen atom the radius of orbit B is 16 times greater than the radius of orbit A. What is the total energy of the electron in orbit B
A proton (q = 1.60×10?19C , m = 1.67×10?27kg)moves in a uniform magnetic fieldB? =( 0.490T )i^. What is the magnitude of the magnetic force acting on the proton
A uniform, cylindrical pulley of mass M=12.7 kg and radius R=0.636 m rotates freely about a fixed horizontal axis. obtain the magnitude of the angular acceleration of the pulley
a 7900 kg car accelerates from rest at the top of a drivewaythat is sloped at an angle of 16.7 degrees with the horizontal. what is the length of the driveway
a billiard ball collides in an elastic head-on collision with a second identical ball. what is the kinetic energy of
An electric motor rotating a workshop grinding wheel at a rate of 9.80x10^1 rev/min is switched off. how long does it take for the grinding wheel to stop
A 0.75 H inductor is in series with a fluorescent lamp, and the series combination is across the 120 V rms, 60 Hz power line. Calculate the resistance of the lamp
A block is connected between two springs on a frictionless, horizontally level track. calculate what is the mass of the block
A storage tank has a diameter of 80 ft, a height of 25 feet, andcontains oil to a height of 15 ft. The suction pumps, whichcan handle 15, 000 bbl/d are started, but the safety valves areclogged and a vacuum is drawn in the tank.
An x-ray beam of a certain wavelength is incident on a crystal, at 31.3° to a certain family of reflecting planes of spacing 41.4 pm. what is the wavelength of the x rays in nanometers
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