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A cylindrical copper rod has resistance of 0.3 ohm. It is reformed to 3.8 timesm its original length with no change of volume. What is its new resistance in ohms?
Four railroad cars, each of mass3.00 x 104 kg, are coupled together and coastingalong horizontal tracks at speed vi toward the south. Find the initial speed of the cars
During a violent storm, a car is struck by a failing high-voltage wire that puts an excess charge of -850 mircoC on the metal car. how much is on the outer surface of the car
A typical lightning flash delivers about 30C of negative charge from cloud to ground. How many electrons are involved
At this point you are getting very tired and would like to get back as quickly as possible, but all of the available trails seem to lead you deeper into the woods. You would like to take a shortcut directly through the woods (ignoring the trails)...
a 100N force acts for 0.05s on a .10kg ball with an initial velocity of -20m/s, What is the final momentum of the ball
A magnifying glass of focal length 150. mm is used to examine an old manuscript. What is the maximum magnification given by the lens
For the situation, the magnetic field changes with time according to the expression B = (2.00t3 - 4.00t2 + 0.800)T, and r2 = 2R = 5.00 cm. (a) Calculate the magnitude and direction of the force exerted on an electron located at point P2 when t = 2.00..
q1. a 10.4-kg cylinder rolls without slipping on a rough surface. at an instant while its center of gravity has a speed
when a 45.0-v emf device is placed across two resistors in series a current of 15.0 a is flowing in each of the
Metal sphere 1 has a positive charge of 8.00nC . Metal sphere 2, which is twice the diameter of sphere 1, What are the final charges on each sphere
A rock is dropped from a sea cliff, and the sound of it striking the ocean is heard 2.8 later. If the speed of sound is 340 , how high is the cliff
A bowling ball with a diameter of 21.9cm is rolling down a level alley surface at 12.1m/s without slipping. how far up the incline will it travel before it stops
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