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Identical point charges of +1.3 oC are fixed to diagonally opposite corners of a square. A third charge is then fixed at the center of the square, such that it causes the potentials at the empty corners to change signs without changing magnitudes. Find the sign and magnitude of the third charge.
A string is wrapped around a pulley with a radius of 2.0cm. The pulley is initally at rest. What is the moment of inertia of the pulley
Two metal rods, one silver and the other gold, are attached to each other. The free end of the silver rod is connected to a steam chamber, with a temperature of 100°C, and the free end of the gold rod to an ice water bath, with a temperature of 0°..
A curve in a road forms part of a horizontal circle. As a car goes around it at constant speed 14.0 m/s, What is the total horizontal force on the driver
A firefighter mounts the nozzle of his fire hose a distance 36.9 m away from the edge of a burning building so that it sprays from ground level at a 45° angle above the horizontal. By what factor was the nozzle diameter changed
An object of a mass 2.5kg accelerates from 2m/s to 10m/s in 10s. What was the net force acting on the object
A person is standing in an elevator that is stationary. What is the weight of the person when the velocity is 3 m/s upward and the acceleration is 2 m/s^2 downward
A 55 kg student traveling in a car with a constant velocity has a kinetic energy of 1.1 104 J. What is the speedometer reading of the car in km/h
q1. a 14 g bullet travelling at 247 ms is fired into a 0.459 kg wooden block anchored to a 100 nm spring. how far is a
In the Bohr model of hydrogen, the electron moves in a circular orbit around the nucleus. Determine the angular speed of the electron
A one loop circuit is connected thus: A 3.0 V source, with the + side connected to a 10 ohm resistor, how much power does the bulb dissipate
A 5.0-kg mass starts from rest and accelerates to a velocity of 8.0 m/s in a time of 10.0 seconds. Calculate the force that is acting on the mass
An object is made of glass and has the shape of a cube 0.11 m on a side, according to an observer at rest relative to it. What is the moving observer's speed (in units of c) relative to the cube
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