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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.
A jet of water squirts out horizontally from a hole near the bottom of the tank, What is the height, h, of the water level in the tank
A beam used in construction is made of steel, which has a coefficient of linear expansion of 1.3 × 10-5 K-1. find the change in the length of the beam due to cooling
Traditional slingshots of old were made from camel hair and are, on average, about 80 cm in length. How long would it take to reach this speed
two converging lenses are separated by 23.40 cm. the focal length of each lens is 12.20 cm. an object is placed 36.40
the stanford linear accelerator accelerated a beam consisting of 1.2 1014 electrons per second through a potential
three point objects with net charge of q1 78 microc q2 47 microc and q3 -80 microc respectively are placed along a
A Styrofoam box has a surface area of 0.74 m2 and a wall thickness of 2.0 cm. The temperature of the inner surface is 5.0°C, and the outside temperature is 27°C. If it takes 8.5 h for 5.0 kg of ice to melt in the container, determine the thermal cond..
The specific heat of water is 4186 J/(kg-degree Celsius) and the specific heat of copper is 387 J/(kg-degree Celsius). What is the mass of water
A 1.1 µF capacitor has an electric field of 1.2x105 V/m between two metal plates 1 mm apart. What is the energy stored on the capacitor
A coil has resistance R=14Ohms and inductance L=3milliHenries and is powered by a generator with variable frequency and maximum voltage V = 10Volts.
(a) In what direction are the electrons deflected? toward the negative plate toward the positive plate (b) By how much are the electrons deflected after passing through these plates?
An inductor with an inductance of 3.00H and a resistance of 7.10? is connected to the terminals of a battery with an emf of 6.10V, Find the final steady-state current
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