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A telescope consists of an objective (f=50cm) and a positive focal length eyepiece (f=?). When the telescope is properly focused on the moon, the separation between the objective and eyepiece is found to be 55 cm. What is the magnification of the telescope?
AN electron moves with a speed of 8.0 x 10^6 m/s along the +x axis. It enters a region where there is a magnetic field of 2.5 T, directed at an angle of 60 degrees to the + x axis and lying in the xy plane. Calculate the magnetic force of the ..
If an electric wire is allowed to produce a magnetic field no larger than that of the Earth (0.50 x 10-4 T) at a distance of 15 centimeter from the wire, obtain the maximum current the wire can carry
A child of a bag at a speed of 0.70m/s. The speed of the river over the edge is 1.50 m/s. Determine the speed of the child
A spherical shell of radius 3.34 centimeter and a cylinder of radius 8.47 centimeter are rolling without slipping along the same floor. find the ratio of the spherical shell angular speed to the cylinder angular speed be
The Earth pulls down on you with a gravitational force that we call your weight. Do you pull up on the Earth with the same amount of force? Explain a few examples in which the force of friction exerted on an object is in the direction of motion of th..
Fleas have remarkable jumping ability. A 0.55mgflea, jumping straight up, would reach a height of 40cm if there were no air resistance. What is the flea's kinetic energy as it leaves the ground
A copper rod hangs vertically from a fixed support. The rod is 1.55 m long and 1.55 mm in diameter. how far does the rod stretch
A 3440-kg spacecraft is in a circular orbit a distance1850 km above the surface of Mars.How much work must the spacecraft engines perform to move the spacecraft to a circular orbit that is 4360 km above the surface?
A long solenoid that has 1,190 turns uniformly distributed over a length of 0.420 m produces a magnetic field of magnitude 1.00 multiply.gif 10-4 T at its center
A person consumes a meal containing 17 kcal. What is the power this meal produces if it is to be "burned off" due to exercise in 6 hours
A single conservative force acts on a 5.00 kg particle within a system due to its interaction with the rest of the system. Calculate the work done by this force on the particle
A car is moving on a flat horizontal circular track of radius 120 m. The speed of the car is constant, 15m/s. The mass of the car is 1200 kg. What force is keeping the car in the circle
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