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An aluminum wire carrying a current of 4.0A has a cross-sectional area of9.010-6m2. Find the drift speed of the electrons in the wire. The density of aluminum is 2.7 g/cm3. (Assume three electrons are supplied by each atom.)
On an ice rink, two skaters of equal mass grab hands and spinin a mutual circl e once every 2.5s. how hard are they pulling on one another
A tennis player receives a shot with the ball (0.060 0 kg) traveling horizontally at 52.5 m/s and returns the shot with the ball traveling horizontally at 38.5 m/s in the opposite direction
Two capacitors, C1 = 6.00 µF and C2 = 14.0 µF, are connected in parallel and the resulting combination is connected to a 9.00 V battery. What is the equivalent capacitance of the combination
A 650kg elevator starts from rest and moves upwards for 3sec with aconstant acceleration until it reaches a cruising speed of1.75m/s. What is the average power of elevator motor duringthis period
A golf ball strikes a hard, smooth floor at an angle of 30 ° and, as the drawing shows, rebounds at the same angle. The mass of the ball is 0.047 kg, its speed is 45 m/s just before and after striking the floor. What is the magnitude of the impuls..
What is the lift (in newtons) by reason of Bernoulli's principle on a wing of area 77 m^2 if the air passes over the top and bottom surfaces at speeds of 270 m/s and 140 m/s, correspondingly.
two concentric metallic shells conductors have radii r and 2r respectively. a charge q is placed on the inner shell and
A river narrows at a rapids from a width of 15m to a width of only 6.0m. The depth of the river before the rapids is 2.7m ; the depth in the rapids is 0.70m. Find the speed of water flowing in the rapids
two large parallel conducting plates are 12 cm apart and have charges of equal magnitude and opposite sign on their
Two 7.0mm×7.0mm electrodes with a0.10-mm-thick sheet of Mylar between them are attached to a 9.0V battery. find the charge before and after the Mylar is withdrawn
You have a 96.1-cm-long copper rod with a rectangular cross section of dimensions 5.47 cm by 7.39 cm. Find the heat current* through the rod
790-loop circular armature coil with a diameter of 10.5 cm rotates at 75.0 rev/s in a uniform magnetic field of strength 0.75 T
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