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Two small spheres spaced 20.0 centimeters apart have equal charge. How many excess electrons must be present on each sphere if the magnitude of the force of repulsion between them is 4.57 x 10^-21 newtons?
A U-shaped tube is partly filled with water and partly filled with a liquid that does not mix with water. what is the density of the liquid
The owner of a van installs a rear-window lens that has a focal length of -0.299 m. When the owner looks out through the lens at a person standing directly behind the van, How tall is the person
One mole of an ideal gas does 2500 J of work on its surroundings as it expands isothermally to a final pressure of 1.00 atm and volume of 28.0 L. Determine the temperature of the gas
A free floating piston cylinder device that contains 1 kg of a 25% quality saturated mixture of water at 150C, Determine the initial and final pressure, the total energy of electrical work added to the water
A sample of a material has 40000 radioactive particles in it today. Your grandfather measured 80000 radioactive particles in it 60 years ago. how many radioactive particles will the sample have
Starting from rest, a 92-kg firefighter slides down a fire pole. The average frictional force everted on him by the pole has a magnitude of 840 N, How far did he slide down the pole
A small, 100g cart is moving at 1.70m/s on an air track when it collides with a larger, 3.00kg cart at rest. what is the speed of the large cart after the collision
In order to view the craters of the Moon, you construct a refracting telescope from a lens with focal length 92.3 cm as its objective and a 14.3-cm focal length lens as its eyepiece
A copper rod 87cm long is used to poke a fire. The hot end of the rod is maintained at 103%u2218C, What is the temperature of the rod 26cm from the cool end
A piece of dynamite is used to break apart a huge 30000 kg boulder (approximately 5 m3 sphere) that rolled into a nice suburban middle-class couple's living room about a decade ago in Spring Valley. What are the momenta of these three chunks
The drawing shows two boxes resting on frictionless ramps. One box is relatively light and sits on a steep ramp. find the speed of the lighter box
A block of mass m is attached to a fixed wall by means of a spring whose force constant is k. The block slides on an inclined plane of angle θ. The kinetic friction coefficient between the block and the inclined surface is μ.
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