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Imagine for a moment that the moon is held in its orbit about the earth by electrical forces rather than by gravitation. What is the necessary electrical charge -Q that would be on the earth and +Q that would be on the moon to hold the moon in a circular orbit of 27.3 days? The Earth moon distance is 384,000 km and the mass of the moon is 7.35 x 1022 kg.
A slide projector has a converging lens whose focal length is103.00 mm. How far from the lens should the screen be located if a slide is placed 105 mm from the lens? If the slide measures 21.0 mm× 37.0 mm, what are the dimensions (in mm) of its image..
A 10.8 g piece of Styrofoam carries a net charge of -0.700 µC and floats above the center of a large horizontal sheet of plastic that has auniform charge density on its surface. What is the charge per unit area on the plastic sheet?
A man and a boy carry a canoe 5.80 m long and weighing 371 N. The canoe is held overhead in a horizontal position. How far from the opposite end should the man stand
A ballistic pendulum is a device used to measure the speed of abullet. A bullet of mass m is fired at a block of wood (mass M)hanging from a string. The bullet embeds itself in the block, and causes the combined block plus bullet system to swing u..
A hovercraft of mass 69.0 kg can move on a horizontal surface, the x-y plane. A single unbalanced force acts on the hovercraft, How much work is done on the hovercraft by the force during this time
On a part-time job, you are asked to bring a cylindrical iron rod of length 93.0 centimeter and diameter 3.00 centimeter from a storage room to a machinist. Compute what is the weight of the rod
An iron bar of mass, 0.81 kg, slides down a frictionless incline 0.39 m high. At the bottom of the incline it collides and sticks to a magnet of mass, 0.87 kg. What is the speed of the combined masses after collision.
The basic function of an automobile's carburetor is to atomize the gasoline and mix it with air to promote rapid combustion
Electrons in a photoelectric experiment emerge from an aluminum surface with a maximum kinetic energy of 2.1eV
If the motor is then switched off, and frictional forces equivalent to a constant horizontal force of 200N act on it, find in what distance will it come to rest
Suppose a spacecraft of mass 28000kg is accelerated to 0.25c, How much kinetic energy would it have
A soldier has a huge contraption that notches a large 4 kg arrow (it looks more like a lance) in a massive bow and uses a winch system to draw the arrow back to set the bow. What is the speed of the arrow
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