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A length of wire has a radius of 3.00 × 10 -3 m and a resistance of 0.200 ?. When the potential difference across the wire is 10.0 V, the electron drift speed is found to be 2.98 × 10 -4 m/s. On the basis of these data, calculate the density of free electrons in the wire.
The component of the external magnetic field along the central axis of a 18-turn coil of radius 28.0 cm decreases from 1.90 T to 0.550 T in 2.10 s. What is the direction of the current
Infrared light of wavelength 2.5micrometers illuminates a 0.20-mm-diameter hole. What is the angle of the first dark fringe in radians
A 1000kg car traveling at a speed of 40m/s skids to a halt on wet concrete where the friction force is 6000N
A dolphin leaps out of the water at the angle of 46° above the horizontal. The horizontal component of the dolphin's velocity is 9.40 m/s. Find out the magnitude of the vertical component of velocity.
A stone is dropped at t = 0. A second stone, with 6 times the mass of the first, is dropped from the equivalent point at t = 59 ms. (a) How far below the release point is the center of mass of the two stones.
A uniform 1.3 kg rod that is 0.8 m long is suspended at rest from ceiling by two springs, one at each end of the rod. Both springs hang straight down from the ceiling.
A 4.4 cm tall object is placed 27 cm in front of a convex spherical mirror. Find the distance, di, of the image (cm), the focal length of the mirror (cm), and the radius of curvature of the mirror (cm)
A 64 woman stands on a very light, rigid board that rests on the bathroom scale at each end. 1.5 m left of her and 2.0m total. what is the reading on each of the scales.
Calculate the shortest wavelength that will be emitted from an X-ray tube in which the electron beam has been accelerated through a potential difference of 30 kV
A large capacitance of 2.00 mF is needed for a certain application. Calculate the volume of Teflon alone in the capacitor
A monatomic ideal gas expands on a linear process such that P=3V + P1 ( initial pressure.) P1 and V1 are the initial pressure and initial volume
One piece of 50 g ice at 0C is added to m grams of water at 25C. The system is insulated from outside and the exchange of heat is limited to ice and water only. find the total change in entropy
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