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A 1.0m long, 1.0 mm diameter copper wire carries a current of 50.0 A to the east. Suppose we create a magnetic field that produces an upward force on the wire exactly equal in magnitude to the wire's weight, causing the wire to "levitate". What are the field's direction and magnitude?
A vertical scale on a spring balance reads from 0 to 245 rm{N}. The scale has the length of 11.0 rm{cm} from the 0 to 245 rm{N} reading. A fish hanging from bottom of the spring oscillates vertically at a frequency of 3.00 rm{Hz}.Ignoring the mass..
1. an 80 kg man climbs a 50 m-high hill in 20 minutes. what is the average power in watts he expends climbing the hill?
a speeding car traveling at 120kmhr passes a cop that is traveling at the same speed in the opposite direction. upoon
Smoke particles in the air typically have masses of the order of 10 to 16 kg. The Brownian motion (rapid, irregular movement) of these particles, resulting from collisions with air molecules, can be observed with microscope.
rita accelerates a 0.40 kg ball from rest to 9.0 ms during the 0.15 s in which her foot is in contact with the ball.
If you had two bars of iron – one magnetized and one un-magnetized – and no other material at hand, how could you determine which bar was the magnet. Explain.
A generator is manufactured to produce a maximum EMF of 200v while rotating with an angular speed of 1000rpm. What is the voltage induced within the coil inside the transformer due to the coil in the generator
A generator connected to an circuit has an rms voltage of 120V and an rms current of 34mA. what is the inductive reactance of the circuit
A golfer tees off from the top of a rise, giving the golf ball an initial velocity of 43 m/s at an angle of 30o above the horizontal. How high is the rise above the fairway
If 5.6 moles of an ideal gas expandes isothermally at 105 degrees C to 6.1 times its initial volume, then find the heat flow into the system
When 5.30* 10^5 J of heat is added to a gas enclosed cylinder fitted with a light frictionless piston maintained at atmospheric pressure, estimate the work done by the gas
A 1.90 × 102-kg sculpture hangs from a horizontal rod that serves as a pivot about which the sculpture can oscillate. How far is the pivot from the sculpture\'s center of mass
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