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An electron with electric charge of 1.6 10-19 C falls through a potential difference of 73 kV in the vacuum of an X-ray tube. What is the kinetic energy of the electron, assuming it started from rest and that there is no loss of energy to friction? (Note: 1 volt = 1 joule/coulomb.)
When a ceiling fan rotating with an angular speed of2.70 {\rm rad/s} is turned off, a frictional torque of0.140 {\rm N \cdot m} slows it to a stop in 25.5 {\rm s}. What is the moment of inertia of the fan
It takes the Earth 24 hours to make a complete rotation around its axis. What is the angular velocity of the Earth in rad/s
Find the height of a building such that falling from the roof gives you a landing speed of 10m/s
An object of mass m is on a frictionless table rotating with a given tangential speed vo with a radius of string ri. Find the final speed of the object after the rope was pulled down the distance d
A thin lens has a focal length of 10.00 cm for red light. If the index of refraction for the lens material tends to decrease with increasing wavelength
Wire 1 carries a 2.0 A current while wire 2 carries a 4.0 A in the same direction. If the wires are 15 cm apart, assume each wire is 1000 km long. Find the magnetic field magnitude and direction experience by at wire 2 due to wire 1
What will be the lowest possible temperature to which very dry air at T = 104F can be cooled by evaporation? Consider p = 1000hPa and latent heat of vaporization constant and equal to 2.4 x 10^6 J/kg.
A satellite in Earth orbit has a mass of 102 kg and is at an altitude of 2.10 106 m. (Assume that U = 0 as r ? ?.), What is the potential energy of the satellite-Earth system
Calculate the resistance of a piece of nichrome wire 2.00 m long. the cross-sectional area of the 20 gauge wire is 0.5176 mm2
An empty parallel plate capacitor is connected between the terminals of a 15.6-V battery and charges up. The capacitor is then disconnected from the battery, and the spacing between the capacitor plates is doubled.
Suppose 60kW is to be transmitted over two 0.150? lines, Estimate how much power is saved if the voltage is stepped up from 200V to 2000V
a 5-microf capacitor is charged to 30 v and is then connected across a 10-microh inductor. the maximum value of the
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