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A copper bar is moved to the right while its axis is maintained in a direction perpendicular to a magnetic field, as shown in the figure below. If the top of the bar becomes positive relative to the bottom, what is the direction of the magnetic field?
A 700 N window washer is standing on a uniform scaffold supported by a vertical rope at each end. The scaffold weighs 200 N and is 3 m long. what is the force in each rope when washer stands 1 m from one end.
Emily has a field with uniformly cut grass of height 2 cm which grows at a constant rate. How long would it sustain each animal alone
A laser that produces a spot of light that is 1.20 mm in diameter is shone perpendicularly on the center of a thin, what is the power of the laser
q. a 2.1-kg block is released from rest and allowed to slide down a frictionless surface and into a spring. the far end
A small charged bead has a mass of 2.0g . It is held in a uniform electric field E? = (200,000 N/C, up). What is the charge on the bead
A very long non conducting cylinder of diameter 10.0 cm carries charge distributed uniformly over its surface. Each meter of length carries +5.50 C of charge. A proton is released from rest just outside the surface.
A ball is thrown horizontally from the top of a 20-m high hill. It strikes the ground at an angle of 45 degrees. With what speed was it thrown
A motor develops 0.75 kW of power at 2000 revs per 10 min. What torque is applied to the motor shaft
Compute the magnitude of the torque on the tree due to the tension in the rope, with the base of the tree acting as the reference point
Calculate the time constant that is equal to the time taken by a capacitor to fully charge or discharge.
Two wooden crates rest on top of one another. The smaller top crate has a mass of m1=20kg and the larger bottom crate has a mass of m2=88kg. what is the acceleration of the lower crate
Nitrogen and oxygen in their liquid states have densities only 0.80 and 0.90 that of water. Atmospheric pressure is due primarily to weight of nitrogen and oxygen gas in the air. If atmosphere liquefied would its depth be greater or less than 10.30 m..
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