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Q1. The rate of energy use in a typical house is about 2 kW. If the kinetic energy of a car (mass 1456 kg) is equal to the total energy used by the house in 1 min, what is the car's speed?
Q2. A flywheel in a motor is spinning at 560 when a power failure suddenly occurs. The flywheel has mass 40.0 and diameter 75.0. The power is off for 34.0, and during this time the flywheel slows down uniformly due to friction in its axle bearings. During the time power is off, the flywheel makes 240 complete revolutions.
The electric field between two equal but opposite point charges, at a point four-ninth the distance from the negative charge to the positive charge, is 4.39*10
A VW Beetle goes from 0 to 65.7 mi/h with an acceleration of +2.34 m/s^2. Find the acceleration of the dragster
From a cliff that is 9.4 m above a lake, a young woman (mass 44 kg) jumps from rest, straight down into the water. At the instant she strikes the water, what is her de Broglie wavelength.
If lithium ion Li+2 is treated as a classical system of one electron of charge ?e going around a nucleus of charge 3e on a circle of radius 1.77× 10?11 m
Consider a 9.5-mm-diameter wire made from copper (mass density 8.9 g/cc, resistivity 1.7E-8 ohm-m). What is the electric field (in V/m) in the wire
The crest of the second hill is circular, with a radius of r = 35m. Avoid friction and air resistance. What must be the height h of the first hill so that skier just loses contact with the snow at the crest of the second hill.
A certain string just breaks while it is under 25 N of tension. A boy uses this string to whirl a 0.75-kg stone in a horizontal circle of radius 2.00 m. The boy continuously increases the speed of the stone. At around what speed would the string b..
A slingshot fires a pebble from the top of a building at a speed of 14.0 m/s. The building is 28.0 m tall. Ignoring air resistance, find the speed with which the pebble strikes the ground
The beam current in a color TV tube is 1.9 rnA. The beam cross section is circular with radius 0.5 mm. What is the current density
A 73.0 kg construction worker stands at the far end of the beam.What is the magnitude of the torque about the point where the beam is bolted into place .
A small, 2.10 g plastic ball is suspended by a 20.0 cm long string in a uniform electric field E = 5.60×103 i N/C, If the ball is in equilibrium when the string makes a 15.0o angle with the vertical
If an electric wire is allowed to produce a magnetic field no larger than that of the Earth .45E-4 T at a distance of 27 cm
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