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an electrical current of 8.70 mA exists in a solid cylindrical wire whose diameter is 1.20 mm. calculate the magnitude of the current density in the wire. Assume that electrons are the charge carriers and the conduction electron density is 2.35 x 10^23/ m^3. then calculate the electron drift speed in the wire.
How much higher or lower is this intensity compared to the 100 keV beam penetration 20 cm of soft tissue - how much higher would the incident intensity, in photons/mm2, need to be for the 20 KeV beam than with the 100 KeV beam?
A series RLC circuit contains the following components: R = 3.00 102 ?, L = 3.50 102 mH, C = 5.00 µF, and a generator with ?Vmax = 2.20 102 V operating at 80 Hz. Calculate the individual maximum voltages across the resistor, inductor
A light wave in air is incident on a water surface, (a) At what angle of incidence are the reflected and refracted waves at right angles to each other? What is the reflectivlty of the water for normal incidence? (c) At what angle of incidence is this..
A container holds 0.05 m^3 of ethanol at a temperature of 15 degrees celcius. The temperature is then raised to 75 degrees celcius. By how much did the volume change
Running on a treadmill is slightly easier than running outside because there is no drag force to work against. What is this force as a fraction of the runner's weight
If the accelerating plates are 1.00cm apart, and have a potential difference of 2.55×104V , what is the magnitude of the uniform electric field between them
The chairs are spaced 19 m apart, and each chair can seat three people. The lift is operating at a steady speed of 8 km/h. Neglecting friction and air drag and assuming that the average mass of each loaded chair is 296 kg, determine the power requ..
A 45 kg woman stands up on a 60 kg platform of length 5m that sits ona frictionless surface. Calculate how far the canoe (platform) slides during the walk
the earth takes slightly less than one day to complete one rotation about the axis passing through its poles. what is the angular speed of the earth about its axis
A bicycle with wheels 48 cm in radius travels down the street with an initial speed of 7.00 m/s. What is the initial angular velocity of the wheels
A 7.70cm length of straight wire runs horizontally along a north-south line. Find the magnitude of the magnetic force on the wire
A dog running in an open field has components of velocity Vx = 3.3 m/s and Vy = -2.3 m/s at time t1 = 11.4 s. What is the direction of the dog's velocity
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