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Q. A length of copper wire carries a current of 10 A, uniformly distributed through its cross section. The wire diameter is 2.5 mm, and its resistance per unit length is 2.5 /km.
Calculate the energy density of the magnetic field at the surface of the wire.
Q. A child slides across a floor in a pair of rubber-soled shoes. Thefriction force acting on each foot is 20.0 N. The footprint area ofeach shoe sole is 14.0cm2, and the thickness of eachsole is 5.00mm. Find the horizontal distance by which the upper andlower surfaces of each sole are offset. The shear modulus of therubber is 3.00 MN/
In order for Sasha (in A-5) to feel weightless at the top of the ride, a) at what linear speed must the Ferris wheel tum? b) At this speed, how much would she appear to weigh at the bottom of the Ferris wheel.
What is wavelength in meters of an electron
Dennis, driving his 600 kg car, makes a 90 degree turn. His speed before the turn is 15.0 m/s and after the turn are 20 m/s. What is the magnitude of the change in car's momentum.
A horizontal ray of light falls on a vertical plane mirror free to turn about the horizontal axis. If the mirror turns through 20o, by what angle does the reflected ray turn.
The coefficient of kinetic friction between block and ramp
A Toyota Prius driving north at 61.0 {rm mph} and VW Passat driving south at 41.0 {rm mph} are on the same road heading along each other (but in different lanes). (We take the positive direction to be north.)
What is least value for which stick remain in equilibrium
Find out an average acceleration of the motorcycle
Illustrate energy bar graphs to solve the problem . What is amplitude of the oscillations.
1.76- block at rest on a ramp of height. While the block is released, it slides without friction to the bottom of the ramp, and then continues across a surface that is frictionless except for a rough patch of width 12.0 that has a coefficient of kine..
charge of -2.95 µC is fixed at the center of a compass. Two additional charges are fixed on the circle of the compass, which has a radius of 0.097 m. The charges on the circle are -3.85 µC at the position due north and +5.20 µC at the position due ea..
A block of wood of mass 2 kg is suspended by long, light strings and is at rest. A bullet of mass 40 g, strikes and remains in the block, causing it to swing. The utmost height of the block above its rest position is 51 cm.
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