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A certain conductor has 7.60 1028 free electrons per cubic meter, a cross-sectional area of 4.00 ? 10-6 m2, and carries a current of 2.30 A. Find the drift speed of the electrons in the conductor.
m/s
Two protons (each with rest mass M=1.67×10?27kg) are initially moving with equal speeds in opposite directions. What is the kinetic energy of each proton
a right- moving EM wave overlaps with a left-moving wave so in a certain region of space the total electric field in the y-direction, Determine the Poynting Vector
A helium-filled balloon contains n = 1.1 moles of helium atoms at room temperature and a pressure P = 2 ? Patm (twice atmospheric pressure). How many moles are in the balloon
Two physicists (on oppisite sides of a cage) are pulling on ropes tied to a lion. What are the force T2 and angle theta 2 of the rope pulled by the physicist 2
An electron with kinetic energy 3.90 keV circles in a plane perpendicular to a uniform magnetic field. The orbit radius is 12.0 cm. find the frequency of circling
The volume of a gas is halved during an adiabatic compression that increases the pressure by a factor of 2.5
An electron with kinestic energy 1.8 keV circles in a plane perpendicular to a uniform magnetic field. The orbit radius is 27.0 cm, Find the period of the motion
If the spring is pulled until it stretches 2.40cm and the pack remains at rest, what is the force of friction exerted on the backpack by the table
A loudspeaker is generating sound in a room. At a certain point, the sound waves coming directly from the speaker, What is the total intensity level
A certain hydrolic system is designed to exert a force 108 times as large as the one put onto it. What must be the ratio of their diamerters
At what temperature is the speed of sound in helium (ideal gas, = 1.67, atomic mass = 4.003 u) the same as its speed in oxygen gas at 4.78 oC
120-v rms signal at 60.0hz is applied across a 30.0mH inductor and a 100 resistor. what is the rms value of the voltage across the inductor
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