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People have proposed driving motors with the earth's magnetic field. This is possible in principle, but the small field means that unrealistically large currents are needed to produce noticeable torques. Suppose a 17-cm -diameter loop of wire is oriented for maximum torque in the earth's field.What current would it need to carry in order to experience a very modest 1.0x10-3N?m torque?
Jonathan and Jane are sitting in a sleigh that is at rest on frictionless ice. Jonathan's weight is 800 N, Jane's weight is 600 N, and that of the sleigh is 1000 N. Calculate the sleigh's horizontal velocity
A cyclotron with a magnetic field B=0.9 T and a maximum orbital radius of 50 centimeter is used to accelerate deuterons (2Hnuclei). Find the frequency of the AC accelerating voltage
In some places, insect "zappers" with their blue lights, are afamiliar sight on a summer's night. These devices use a highvoltage to electrocute insects. One such device uses an ac voltageof 4320V, which is obtained froma standard 120.0V outlet by..
A 47.3-cm diameter disk rotates with a constant angular acceleration of 2.70 rad/s2. It starts from rest at t = 0, Find the angular speed of the wheel
A cube 21cm on each side contains 3.5g of helium at 20 \; ^\circ \rm C. 1400J of heat energy are transferred to this gas.
In an engine, a piston oscillates with simple harmonic motion so that its position varies according to the expression, x = 3.00 cos 5t + ? 5, Find the period and amplitude of the motion
ship a is located 4.8 km north and 2.5 km east of ship b. ship a has a velocity of 22kmh toward the south and ship b
Discover the focal length of a lens that produces an inverted image three times the size of a small object placed on the optical axis, 44.0 cm from the lens
A car of mass 1800 travelling at 60.7 enters a banked turn covered with ice. The road is banked at an angle, and there is no friction between the road and the car's tires. Use = 9.80 throughout the problem.
At an instant when a soccer ball is in contact with the foot of the player kicking it, the horizontal or x component of the ball's acceleration is 940 m/s2 What is the magnitude of the net force acting on the soccer ball at this instant
A world-class sprinter accelerates to his maximum speed in 4.2s . He then maintains this speed for the remainder of a 100-{\rm m} race, What is the runner's average acceleration during the first 4.2s
a uniform rod of mass 2m is completely free to move and is initially at rest. a particle of mass m hits one of its ends
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