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A conducting bar slides without friction on two parallel horizontal rails that are 25.0 cm apart and connected by a wire at one end. The resistance of the bar and the rails is constant and equal to 0.100 Ω. A uniform magnetic field is perpendicular to the plane of the rails. A 0.0450-N force parallel to the rails is required to keep the bar moving at a constant speed of 0.750 m/s. What is the magnitude of the magnetic field?
A rescue helicopter lifts a 79-kg person straight up by means of a cable. Use the work-energy theorem and find the final speed of the person
In effect, the first circular dark fringe in the diffraction pattern defines the size of the central bright spot on the moon. find the diameter (not the radius) of the central bright spot on the moon.
What is the voltage across the capacitor just after the switch is closed? What are the currents in both resistors a long time after the switch is closed?
A 50.0-kg child on a 2.0 m long swing is released from rest when the swing supports make an angle of 30 degrees with the vertical. find the potential and kinetic energies of the child
q1. a 5.2 x102-newton girl takes 10. seconds to run up two flights of stairs to a landing a total of 5.0 meters
what mass of water at 27.0 degc must be allowed to come to thermal equilibrium with a 1.59-kg cube of aluminum
Photons of wavelength 334 nm are incident on a metal plate in a photocell and electrons are ejected. What is the maximum wavelength of photons that will eject electrons from this metal
Consider a particle of radius s that orbits a solar mass star at 1 au on a circular orbit.Calculate the mass of gas that the particle collides with during one orbit about the star
What is the frequency heard by a person driving 62.41 km/h toward a blowing factory whistle (f = 425.84 Hz) is the air temperature is 20.03 oC
a cylindrical container of initial volume v0 contains n atoms of a classical ideal gas at room temperature t300 k. one
A certain substance has a dielectric constant of 2.8 and a dielectric strength of 18.0 MV/m. If it is used as the dielectric material in a parallel-plate capacitor, what minimum area should the plates of the capacitor have to obtain a capacitance of ..
10.2 A wire is made out of a steel alloy with Y = 2.00×1011Paand breaking stress 1.00×109 Pa . The wire is 5m long and is secured at one end to the ceiling and hangs vertically
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