In the figure below, the rolling axle, 1.43 m long, is pushed along horizontal rails at a constant speed .
A resistor ohm is connected to the rails at points a and b, directly opposite each other. (The wheels make good electrical contact with the rails, and so the axle, rails, and R form a closed-loop circuit. The only significant resistance in the circuit is R.) There is a uniform magnetic field vertically downward. Calculate the induced current I in the resistor and what horizontal force F is required to keep the axle rolling at constant speed?
a 350 kg sailboat has anacceleration of 0.62 m/s^2 at an angle of 64 degrees north ofeast.find the magnitude and direction of the net force that acts onthe sailboat.
A conducting sphere of radius 0.01m has a charge of deposited on it. The magnitude of the electric field in N/C justoutside the surface of the sphere is: