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Consider a 32m-long cable with cross sectional area of 2 x 10-6 m2 that carries a current density of 12500 a/m2 when 220v are applied, calculate current, resistance, conductivity and resistivity.
An elevator's cable snaps and its emergency brakes start gripping at the secondary line in order to slow its descent. How fast is the elevator going after falling 3 stories
The radius of the hydrogen atom is 0.053 nm. What is the frequency of the circular motion of the electron in the hydrogen atom
Write the nuclear equation for decay - Calculate the binding energy per nucleon and How many nuclei are initial present in a 25.0 mg sample?
A bright object and a viewing screen are separated by a distance of 80 cm. At what locations among the object and the screen must a lens of focal length 14 cm be placed in order to produce a crisp image on the screen?
A 5kg object is initally at rest. The object is acted on by a 9N force toward the east for 3 seconds. How far has the object moved during this 7 second interval
String is wrapped several times around the rim of a small hoop with radius 0.0800 meters and mass 0.137 kg. If the free end of the string is held in place and the hoop is released from rest compute the tension in the string while the hoop descends as..
An object is 32cm in front of a converging lens with a focal length of 6.9cm, Use ray tracing to determine the location of the image
Consider a resistor series RC circuit with a 6.7 µF, capacitor, a 4.5 × 10^6? resistor and 38 V emf. Find the maximum charge on the capacitor
A power transmission line 50km long has a total resistance of 0.60 ohms. What percentage of the original energy is lost when the transformer is used
A professor's office door is 0.94 wide, 2.2 high, 4.0 thick; has the mass of 23, and pivots on frictionless hinges. A "door closer" is attached to door and top of the door frame. When the door is open and at rest, the door closer exerts a torque of 5..
1. a spring with negligible mass stretches 34.0 cm when a 144 g gram mass is suspended from it. now i suspend a mass
the bent rod is supported at a b and c by smooth journal bearings. determine the magnitude of f2 which will cause the
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