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An artificial satellite is placed into a natural synchronousorbit above the equator and is attached to the earth below awire. A second satellite is attached to the first by a wireof the same length and is placed in orbit directly above the firstat the same angular velocity. Assuming that the wires have zeromass, calculate the tension in the wires per unit mass ofsatellite. Could this tension be used to lift objects into orbitwith no additional expenditure of energy?
A parallel-plate vacuum capacitor with plate area A and separation x has charges +Q and -Q on its plates. The capacitor is disconnected from the source of charge, What is the change in the stored energy
my refrigerator has cop of 5.00. its power input is 615W . A sample of mass of water is 500 g and temp of 20C is placed into the freezer. determine the COP of the fridge
Assume that you need to get a heavy couch into the bed of a pickup truck. You know the bed of the truck is at the height of 1.00 and you require a ramp that makes an angle of 40 with the ground if you are to be able to push the couch.
A ball of mass m makes a head-on-elastic collision with a second ball (at rest) and rebounds with a speed equal to one-fourth its original speed. What is the mass of the second ball.
The magnetic field produced by an MRI solenoid 2.7m long and 1.7m in diameter is 1.9T. Find the magnitude of the magnetic flux through the core of this solenoid
A 7.80-g bullet moving at 650 m/s penetrates a tree trunk to a depth of 5.4 cm. Use work and energy considerations to find the average frictional force that stops the bullet
A railroad car of mass 2.5 104 kg moving at 3.50 m/s collides and couples with two coupled railroad cars, How much kinetic energy is lost in the collision
Sound is passing perpendicularly through an open window whose dimensions are 1.1 m x 0.75 m. How much sound energy comes through the window
A stone is dropped from the roof of a building; 1.90s after that, a second stone is thrown straight down with an initial speed of 25.0m/s , How long did it take the first stone to reach the ground
a wire carrying a current is placed in a uniform magnetic field. When a current of 3.7A flows in the wire there is a force of 0,075N on each 18cm of wire in the field
During the transition of the metal from the boiler to the cup, some heat may have been lost to the air. If no heat was lost, how would your values for the final temperature change?
A ceiling fan is turned on and a net torque of 1.6 N·m applied to the blades. What is the angular acceleration of the blades
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