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A small but measurable current of 1.6 10-10A exists in a copper wire whose diameter is 3.1 mm. suppose the current is uniform.
1) Compute the current density.
2) Compute the electron drift speed.
How is current density related to cross-sectional area and (uniformly distributed) current? How is current density related to the drift speed of the conduction electrons?
In the alpha decay of 211 Bi to 207 Tl two groups of alpha particles with known energies 6.623 and 6.279 MeV, are observed. What is the energy difference between these two states
A certain toaster has a heating element made of Nichrome resistance wire. What is the final temperature of the heating element
a sinusoidal transverse wave moves along a stretched string in the +j direction with amplitude 5 cm, wavelength 2 m, and wave speed 200 m/s. Write a possible wave function for the wave with an explanation
the near point of a given individual's eyes is 55cm. what focal length corrective lens should be prescribed
Rolled a sphere, hollow, and non-hollow cylinder down an inclined slope. What experimental problems would arise if they rolled too fast down the slope
a magnetic dipole is under the influence of two magnetic fields. the angle between the field directions is 60ordm and
A 1.80 kg block slides on a rough, horizontal surface. The block hits a spring with a speed of 1.80 m/s and compresses it a distance of 11.0 cm before coming to rest. If the coefficient of kinetic friction between the block and the surface is µk = 0...
An air-traffic controller observes two aircraft on his radar screen. The first is at altitude 750 m, What is the distance between the two aircraft
A 4.94-g bullet is shot through a 0.99-kg wood block suspended on a string 2.00 m long. The center of mass of the blockrises a distance of 0.50 cm. Find the speed of the bullet as itemerges from the block if its initial speed is 393 m/s.
A stone of weight W has specific gravity 1.68. When the stone is suspended from a scale and submerged in water, what is the scale reading in terms of its weight in air
a mass on a string of unknown length oscillates as a pendulum with a period of 2.2s . parts a to d are independent
A bug starts at the origin of the xy coordinate system with an initial velocity of (2.2 + -0.4) m/s, What is the y position of the bug at t=2 seconds
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