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A 0.95-m aluminium bar is held with its length parallel to the east-west direction and dropped from a bridge. Now before the bar hits the river below, its speed is 25 m/s, and the emf induced across its length is 7.5 x 10-4 V. Assuming the horizontal component of the Earth's magnetic field at the location of the bar points directly north, (a) Decide the magnitude of the horizontal component of the Earth's magnetic field, and (b) state the number of which end of the bar is positive: 1 = east, 2 = west.
A closely wound circular coil with a diameter of 3.60 cm has 560 turnsand carries a current of 0.560 A. What is the magnitude of the magnetic fieldat the center of the coil?
Gas is contained in an 6.5 L vessel at a temperature of 20°C and a pressure of 7.4 atm. Determine the number of moles of gas in the vessel
A small object is 10 cm to the left of a converging lens (f = +5 cm), and a second diverging lens (f = -3.3 cm) is 5.8 cm to the right of the first. Find the position and magnification of the final image by calculation
At an altitude of 260 m above the Earth's surface, the field is only 105 N/C. Calculate the charge density of the air (assumed constant).
find the speed of the test charge when it reaches the center of the square.
A irregular piece of metal has a dry mass of 5.7 kg. Once it is submerged it has an apparent mass of 2.4 kg. What is the density of the piece of metal
Please show steps: Hydraulic engineers in the United States often use, as a units of volume of water, What volume of water, in acre-feet, fell on the town
mary is in a train traveling at 30ms. fred is standing next to the train tracks.the train passes fred at 30ms. 2m after
A wheel has a maximum rate of rotation of 150 revolutions per minute. Starting from rest, Calculate the magnitude of its angular acceleration
a charge of -6.50 nc is spread uniformly over the surface of one face of a nonconducting disk of radius 1.25cm.a find
A wire of length l = 12.0 cm is moving with constant velocity in the xy-plane; the wire is parallel to the y-axis and moving along the x-axis. what must the velocity of the wire be
A parallel-plate capacitor is made from two plates 12.5 cm on each side and 4.20 mm apart. Half of the space between these plates contains only air, but the other half is filled with Plexiglas of dielectric constant 3.40.
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