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An air-filled toroidal solenoid has a mean radius of 15.0 and a cross-sectional area of 5.02 (see the figure). The current flowing through it is 12.0 , and it is desired that the energy stored within the solenoid be at least 0.390 What is the least number of turns that the winding must have? Express your answer numerically, as a whole number, to three significant figures.
A 196.3 kg satellite is in a circular orbit of 26,273 miles (42,300,000 m) in radius. The force keeping the satellite in orbit is 40.1 N
A lunar lander is making its descent to Moon Base I. The lander descends slowly under the retro-thrust of its descent engine. What is the speed of the lander
A 5.80 m length of 2.0 mm diameter wire carries a 750 mA current when 22.0 mV is applied between its ends. determine the electric field inside the wire
A muscle builder holds the ends of a massless rope. At the center of the rope, a 7.9 kg ball is hung as shown. What is the tension in the rope
You are pushing a 150-kg wooden crate in a straight line a distance of 4.5 m across a wooden floor at constant speed. What is the work done by friction on the crate
Find time constant if the ball's amplitude has decreased to 2.20 cm after 51.0 oscillations? Explain your answer.
A drunk driver in a 1600 kg car plows into a 1500 kg parked car with its brake set. Police measurements show that the two cars skid together a distance of 19 m before stopping. If the effective coefficient of friction is 0.78, how fast was the dru..
Photons with wavelength 670 nm are capable of producing photoelectrons from a particular substance. Determine the substance's work function and cutoff wavelength
A scuba diver takes a tank of air on a deep dive. The tank's volume is 10 L and it is completely filled with air at an absolute pressure of 222atm at the start of the dive
Assume we have an infinitely long wire carrying a current of 2.50 A. It is bent into an L-shape extending into positive infinities along x- and y- axes. Find out the magnitude of the magnetic field at a point P with coordinates (0.30 m, 0.30 m)
A radio telescope, whose two antennas are separated by 55 , is designed to get 3.0- radio waves produced by astronomical objects.
Find the strength of the magnetic field that causes a torque of 2.09 × 10-5 N·m to act on the loop when a current of 0.00361 A flows in it
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