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Calculate the maximum current density in a lead wire of diameter 4 mm at a temperature of 4.2K if the wire is to remain superconducting. The relevant values for lead are Tc= 7.19k and Bc =6.39 x104 A/m . (note that the magnetic field in the wire is given by B = µ0I/2?r where r is the radius from the center of the wire.
One of the attempts to contain the spill involved pumping drilling mud into the well to balance the pressure of escaping oil against a column of fluid (drilling mud) having a density significantly higher than that of seawater and oil.
You have a 1.93-m-long stretched string with a mass of 19.5 g. When you oscillate the string at 440 Hz, Calculate the tension in the string
An object is dropped from the top of a tower at a height of 44.1 m. How much time does the object take to reach the ground
Suppose a spacecraft of mass 28000kg is accelerated to 0.25c, How much kinetic energy would it have
A particle of charge q = e moves in a circle of radius = 0.42 m with speed v = 2.150×107 m/s. find the maximum torque exerted on the loop by a uniform magnetic field of magnitude B = 0.60 T
Light of wavelength 670nm falls on two slits and produces an interference pattern in which the third-order bright red fringe is 49mm, What is the separation of the two slits
A mass is trapped on the x-axis. Its potential energy is given by U=-2x^3 -3x^2 +12x. Where x is i meters and U is in joules. A) Determine an expression for the force that acts on the mass as a function of position.
A small, 10.0 g insect stand at one end of a thin uniform metal rod which is initially at rest on a frictionless horizontal table. What is the resulting angular speed of the rod
It's nighttime, and you've dropped your goggles into a 2.8m deep swimming pool. If you hold a laser pointer 0.90m above the edge of the pool, How far are the goggles from the edge of the pool
A window in a house is rectangular, with height 40 cm and width 30 cm. The pressure inside the house is normal atmospheric pressure, What is the force on the window
question1a 75 kg human sprinter is able to accelerate from rest to 12 ms in 3.3 s. all through the same interval a 33
q1. a 23 g ball is fired horizontally with initial speed toward a 110 g ball that is hanging motionless from a 1.1m
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