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A wire made from copper with a cross-section of diameter 0.890 millimeter carries a current of 13.0 Amp. Determine the "areal current density"; in other words, determine how many electrons per square meter per second flow through this wire?
The density of copper is 8.92g/cm3, and its atomic mass is 64.0. Assuming each copper atom contributes one mobile electron to the metal, find the number density of free charges in the wire, in electrons/m3?
Due to thermal motion, the electrons at room temperature are randomly traveling to and fro at1.12 × 105 m/s, even without any current. Find what fraction is the current drift speed, compared to the random thermal motion?
A 11.2 kg object oscillates at the end of a vertical spring that has a spring constant of 1.90 104 N/m. Calculate the frequency of the dampened oscillation
The focal length of a converging lens is 5.0cm. An object is placed 3.0cm from the lens. What is the image distance?
Tension is maintained in a string. The observed wave speed is 25 m/s when the suspended mass is 3.0 kg. (a) What is the mass per unit length of the string? (b) What is the wave speed when the suspended mass is 1.7 kg?
Two masses m1= 5.00 kg and m2 = 3.00 kg are connected by a string, What is the frictional coefficient of the surface
A satellite is in a circular orbit around the Earth at an altitude of 1.68 106 m. Find the acceleration of the satellite
In Mexico, a courageous diver runs horizontally off the edge of a sea side cliff 48.8 m above the sea (about six stories high). Calculate her speed and direction angle of her velocity as she hits the water(or rocks)
If a plaintiff voluntarily enters into or participates into a risk activity that results in injury, illustrate what is the most likely defence that he or she may use to a defendant's claim that the plaintiff supposed the risk?
When his mom asked him why he is smoking he told her, "Don't worry mom, it is not that bad after all." Which term is being described in Trent's situation.
The Hall voltage across a conductor in a 55 magnetic field is 1.9 . When used with the same current in a different magnetic field, the voltage across the conductor is 3.
An induced emf of 12V is produced when a 350 loop coil, ofradius 4.2cm , is placed perpendictular to a megnetic fieldand turn 90deg in 0.08s. Calculate the intensity of the magnetic field
A lead rod (a = 29x10-6 K-1) has a circular cross-section of 0.500 cm radius. At what temperature both pieces have zero margins
A 160-lb gymnast is executing a series of full-circle swings on the horizontal bar. determine his angular velocity and the force exerted on his hands
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