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On a cold day, Ming rubs her hands together to warm them up. She presses her hands together with a force of 4.1 N. Each time she rubs them back and forth they move a distance of 16 cm with a coefficient of kinetic friction of 0.44. Assuming no heat flow to the surroundings, after she has rubbed her hands back and forth eight times, by how much has the internal energy of her hands increased?
A wheel has a maximum rate of rotation of 150 revolutions per minute. Starting from rest, Calculate the magnitude of its angular acceleration
A 4.0 kg mass is hung from a string which is wrapped around a cylindrical pulley (a cylindrical shell), what is the mass of the pulley
A parallel-plate air-filled capacitor having area 41.0 cm2 and plate spacing 2.70 mm is charged to a potential difference of 360. V. calculate the energy density between the plates
Two cars have a head on collision. Both were traveling at 42m/s toward each other. Car A has a mass of 722 KG. Car B has a mass of 848KG. After impact, car A is moving backward at 2 m/s. What is car B's velocity after impact.
The speed of sound in air is 345 m/s. A tuning fork vibrates above the open end of a sound resonance tube. what is the frequency (in Hertz) of the tuning fork
A glass is half-full of water, with a layer of oil (n = 1.50) floating on top. Determine the critical angle for the oil-water interface
a manufacturer of fasteners uses a four die nut former to produce blanks and the piercer punch began to break down
With what tension should a rope with length 3.00m and mass 0.135kg be stretched for transverse waves of frequency 43.0Hz to have a wavelength of 0.720m. What torque does friction exert even as this wheel is slowing down.
Assuming that all the heat generated by the resistor is absorbed by the solid substance, and that it takes 4 minutes to raise the temperature from 20to 80 degrees C, compute the specific heat for the substance.
in 1960, mrs maxwell rogers of tampa florida, reportedly raised one end of a car that had fallen onto her son when a jack failed. If her panic lift effectively raised 4000 N (about a quarter of the car's weight) by 5 cm, how much work did her forc..
An object is 12.0 cm in front of a convex mirror. When the convex mirror is replaced with a flat mirror, What is the focal length of the convex mirror
An object with a mass of 5.5 kg is allowed to slide from rest down an inclined plane. What is the speed of the object at the bottom of the plane
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