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A wire has a current density of 7.81 × 106 A/m2. If the cross-sectional area of the wire is 1.23 mm2, what current does the wire carry? With this current, how much time is required for 3.91 × 1020 electrons to pass any point on the wire?
Neutron stars consist only of neutrons and have unbelievably high densities. Find the density of such a star
Suppose that a plane is flying due west with an airspeed of 222 km/h. What is the magnitude of the wind velocity
A coin is thrown vertically down into a well with an initial velocity of 2.5 m/s. What is the velocity of the coin
using your knowledge of statics discuss briefly why the magnitude and direction of the knee reaction force varies with
Water moves into a pipe of cross sectional area 0.5m2 at a rate of10m/s. at a pressure of 10,000kPa. Determine the mass rate of flow of the water. The duct necks down to a cross-sectional area of 0.2m2. Determine the velocity in this cross-section.
A ball is thrown so that its initial vertical and horizontal components of velocity are 30 m/s and 25 m/s, Estimate the maximum height the ball reaches
A burglar alarm in a house emits sound at a fixed frequency of 3.1 kHz. On a windy day a person cycles past the house while the alarm is sounding. What frequency does the cyclist hear
A heat engine operating between 40oC and 380oC has an efficiency 60% of that of a Carnot engine operating between the same temperatures. at what rate does it exhaust heat
A ball falls straight down onto a wedge that is sitting on frictionless ice. The ball has a mass of 3.27 kg, and the wedge has a mass of 5.31 kg. what is the velocity of the ball after the collision
What is the capacitance of a pair of circular plates with a radius of 9.0cm separated by 3.2mm of mica?
A centrifuge in a medical laboratory rotates at an angular speed of 3400 rev/min. Find the constant angular acceleration of the centrifuge
Two blocks are connected over a massless, frictionless pulley, What is the value of the tension in the string
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