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A motor with a brush-and-commutator arrangement has a circular coil with radius 2.5cm and 150 turns of wire. The magnetic field has magnitude 0.060T and the coil rotates at 440 (rev/min.). The arrangement is akin to a tennis racket rotating on an axis along its handle in a magnetic field perpendicular to that axis. What is the maximum emf induced in the coil? Some scientists propose to provide power for a satellite by dropping a long conducting tether. A lightweight 100m long conducting wire is unspooled from the satellite and hangs perpendicular to the earth's surface. Assume the earth's magnetic field is essentially horizontal and has a value of 8 ×10-5T at the altitude of the satellite; ignore any changes in B with altitude. The satellite is travelling about 420 km/minute. What is the voltage generated by the tether? List one physical consequence of this arrangement after many orbits of the satellite Nuclear Fusion. If two deuterium nuclei get close enough together, the attraction of the strong nuclear force will fuse them to make an isotope of helium, releasing vast amounts of energy. This is the principle behind the fusion reactor. The deuterium gas is much too hot to be contained by material walls, so they are confined in a "magnetic bottle". Useful constant: 0 = 8.85 × 10-12F/m. (a) How fast would two nuclei have to move so that in a head-on collision they would get close enough to fuse? Treat the nuclei as point charges +e and mass 3.34 × 10-27kg, and assume that a separation of 1.0 × 10-15m is needed for fusion. (b) What strength magnetic field is needed to make deuterium nuclei with this speed travel in a circle of radius 8.14m (the radius of the experiment ITER to start operation in the 2020s)? Compare this value with the magnetic field strengths mentioned in the previous questions.
an explorer is caught in a whiteout in which the snowfall is so thick that the ground cannot be distinguished from the
A vertical spring of spring constant 140N/m supports a mass of 80g. The mass oscillates in a tube of liquid. Estimate the damping constant b
In a physics laboratory experiment, a coil with 190 turns. Each turn of the coil encloses an area of 7.0 cm2. Obtain the magnetic flux through one turn of the coil before it is rotated
electrons produced by a certain device are observed to travel in a circular path with a radius of 2.50 cm when placed
The flywheel of a motor has a mass of 300 kg and a moment of inertia of 580 kg*m^2 The motor develops a constant torque of 2000 N*m and the flywheel starts from rest. How much work is done by the motor during the first 4.00 revolutions
how much work is done by an applied force that moves two charges of 8.4 microc that are initially very far apart to a
A positive charge, Q = 45 is placed on the x-axis at x = -1.9 cm. A positive charge which is twice as large is brought from infinity to a point x = +1.9 cm on the x-axis. what would be the speed of the 2*(45) charge at infinity
a 12 kg block is moving horizontally across a frictionless surface with a constant velocity of 25 ms. it then hits a
An air conditioner connected to a 120 V rms ac line is equivalent to a 12.7 ? resistance and a 1.53 ? inductive reactance in series. estimate the impedance of the air conditioner
two identical metal spheres a and b are connected by a metal rod. both are initially neutral. 1.6times1012 electrons
you draw 270 ml of 10 degrees celcius water from the tap and pop it into a 900-w microwave oven to heat for tea. how
A student throws a baseball at a large gong 76 m away and hears the sound of the gong 1.95758 s later. What was the average speed of the base- ball on its way to the gong
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