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Two students hold a long wire and rotate it across the earth's magnetic field so that the wire traces a circular path of radius 1.2 m. The motional emf produced in the rope is then measured on a voltmeter. If the angular frequency of rotation is w = 12 rad.s-1, calculate the maximum possible motional emf in the wire. (Use B = 0.3 G = 0.3Ax10-4 T for the Earth's magnetic field.)
Two 1.5cm -diameter disks face each other, 1.1mm apart. They are charged to ±20nC. What is the electric field strength between the disks
A block of mass 4.7 kg slides 20 m from rest down an inclined plane making an angle of 24 o with the horizontal. If the block takes 10 s to slide down the plane, what is the retarding force due to friction?
Cart A, with a mass of 2 kg, travels on a horizontal air-track at 3 m/s and hits cart B, which has a mass of 4 kg and is initially at rest. what is the speed of the center of mass of the two-cart system
three charges each of magnitude 7 nc are at separate corners of a square of edge length 7 cm. the two charges at
What is the minimum potential difference that should be applied to an X-ray tube to knock a K-shell electron completely out of an atom in a nickel (Z = 28) target? Utilize the Bohr model as needed.
microtubules are protein filaments that are only 25 nm in diameter. this is smaller than the diffraction limit for
Three identical stars of mass M = 3.1x1030 kgform an equilateral triangle that rotates around the triangle'scenter as the stars move in a common circle about that center. Thetriangle has edge length L = 8.3x1010 m. What is the speed of the stars?
Use Newton's laws to determine the value of electron's velocity after it moves 0.40cm from rest. Express your answer using two significant figures
The minimum distance required to stop a car moving at 34 mi/h is 42 ft. What is the minimum stopping distance for the same car moving at 64.0 mi/h, assuming the same rate of acceleration.
A 400W computer (computer plus monitor) is turned on 8.0 hours per day. find how much does it cost to run the computer annually
A pitcher throws a 0.145-kg baseball to a batter at 36 m/s. The batter hits the ball straight back at the pitcher at 49 m/s. The amount of time that the bat and ball are in contact is 9.0E-3s. What is the force (in N, assumed to be constant) among th..
A ferromagnetic metal at very low temperatures has a specific heat capacity given by c(T)= zT+yT^3+zT^(3/2). find the entropy increase due to this process
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