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a 220 kg cylinder falls 2.5m in a joule water heater . as the cylinder falls it stirs the water. assume that 90% of the energy lost by the cylinder all goes increasing the temperature of the 300g water bath. how much does the water temp change?
Light from a sodium lamp with a wavelength in a vacuum of 590 nm enters diamond in which the speed of light is 1.24 108 m/s. What is the wavelength of this light in diamond
A string is rolling several rolls about a solid sphere, and then the sphere leaved to fall from the end of the string. What is the acceleration of the center of the sphere
If an electron moves from one point at a potential of ?500.0 V to another point at a potential of +500.0 V, how much work is done by the electric field
A 2.78-kg steel ball strikes a massive wall at 10.0 m/s at an angle of ? = 60.0° with the plane of the wall, what is the average force exerted by the wall on the ball
Sketch a free body diagram for the hot air balloon. When the burner is turned on what force is required to cause an upward acceleration of 5m/s squared?
a positron emission tomography scanner examines the gamma rays emitted when positrons and electrons annihilate each other. What is the wavelenth of the photons
Your car's fan belt turns a pulley at 3.15rev/s . When you step on the gas for 1.60s , the rate increases steadily to 5.95rev/s . What's the pulley's angular acceleration
question1a 150 30.0-cm-diameter turntable rotates on frictionless bearings at 61.0. a 17.0 block sits at the center of
A mass of 500kg, with a velocity of 25m/s, hits a stationary mass of 200kg. The masses stick together after the collision. What is the velocity of the masses after the collision
A child with a mass of 55 kg is riding on a merry-go-round. If the child has a speed of 3 m/s, what is the child's angular momentum
Two metal spheres, each of radius 1.0 cm, have a center-to-center separation of 2.0 m. Sphere 1 has charge +2.90 10-8 C. Calculate the potential at the point halfway between the centers
3 charges (q1=2q, q2 = 3q, q3=-q ) where q = 1c , are arranged to form an equilateral triangle that is 10 cm on a side. What is the electric feild in the middle
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