What length must tye copper wire cut
A copper wire with a resistance of 4.00Ω at 20.0o C has a length of 5.00 m. If it is to have the same resistance and cross sectional area at 40.0o C to what length must it be cut?
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A person with perfect pitch sits on a bus bench listening to the 455 Hz horn of an approaching car. If the person detects a frequency of 475 Hz, how fast is the car moving?
Determine the pressures at state 2 and 3. Determine the change in specific internal energy, u, for each of the two processes.
You want a solution of ethylene glycol, C2H4(OH)2, that has a glycol mole fraction of 0.125. How many grams of the glycol should you combine with 950 grams of H2O? What is the molality of the solution?
Only two horizontal forces act on a 3.0 kg body that can move over a frictionless floor. One force is 9.0 N, acting due east, and the other is 7.2 N, acting 56° north of west. What is the magnitude of the body's acceleration?
An automatic machine inserts mixed vegetables into a plastic bag. Past experience revealed that some packages were underweight and some were overweight, but most of them had satisfactory weight.
The structure of manganese fluoride can be described as a simplecubic array of manganese ions with fluoride ions at the center ofeach edge of the cubic unit cell.
The window is 2.0 m high by 1.2 m wide. One window surface is at 25 degrees C and the other at 10 degrees C. Calculate the free convection heat-transfer rate through the air gap.
A negative ion is moving east near the equator where the Earth's magetic field is horizontal to the north. The direction of the magnetic force on the ion is.
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