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An electric motor contains a 250-turn circular coil 5.8cm in diameter. If it is to develop a maximum torque of 1.6Nm at a current of 4.0 A, what should be the magnetic field strength?
A small ball rolls horizontally off the edge of a tabletop that is 1.20 m high. It strikes the floor at a point 1.76 m horizontally away from the edge of the table. What is its speed at the instant it leaves the table
Perpetual motion machines have fascinated people especially inventors for hundreds of years before the laws of thermodynamics became known. Ideally, once energy is added to start a perpetual motion in machine, the machine would continue to operate..
A fireman d = 60.0 m away from a burning building directs a stream of water from a ground-level fire hose at an angle of ?i = 22.0° above the horizontal, at what height will the stream of water strike the building
q1. a 260 wooden raft floats on a lake. when an 80 man stands on the raft it sinks 5.0 deeper into the water. when he
A 15 ohm resistor has a voltage difference of 1 V across its leads. What is the power being dissipated in this resistor
Some bacteria are propelled by motors that spin hair-like flagella. How long does it take the motor to make one revolution
A coyote can locate a sound source with good accuracy by comparing the arrival times of a sound wave at its two ears. What is the distance between the bird and the coyote's left ear
a superball with mass equal to 50 grams is dropped from a height of 1.5m . It collides with a table, then bounces up to a height of 1m. Find the y component of the momentum of the ball immediately before the collision
The detective who investigated the scene of the crime found a second bullet, from the shot that missed Mr. Wesson, that had embedded itself into a chair.
A hot ( ) lump of metal has a mass of 250g and a specific heat of 0.25 . John drops the metal into a 500g calorimeter containing 75g of water at . The calorimeter is constructed of a material that has a specific heat of 0.10 . When equilibrium is ..
A 4.00-g bullet is moving horizontally with a velocity of +355 m/s, where + sign indicates that it is moving to the right. The bullet is approching two blocks resting on a horzizonta frictionless surface.
A parachutist descending at the speed of 25 m/s loses a shoe at an altitude of 50 m. (Assume the positive direction is upward.)
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