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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.
During a fun run a girl runs for 12 s moving 2.7 m/s. She then accelerates at 0.5 m/s^2 over the next 25 m. she then runs at her new speed for 10s. What distance did she cover during the entire period?
a 4.0 kg block slides along a frictionless surface with a constant speed of 5.0 m/s as shown. What is the speed of the Block at t = 11 seconds
An archeological specimen containing 10.2gram of carbon has an activity of 0.8 Bq. Estimate How old is the specimen
A 2.00-g charged particle is released from rest in a region that has a uniform electric field = (160 N/C) . After traveling a distance of 0.520 m in this region, the particle has a kinetic energy 0.080 J. Determine the charge of the particle.
assume you have a perfectly isolated closed system under reversible and isothermal conditions where pv 0.8
if the radius of a blood vessel is reduced by cholesterol deposits to 90 of its original value flow will decrease. by
A solenoid of length 5.6 cm and diameter 0.88 cm is wound with 167 turns per cm. The current is decreasing at a rate of 37.4 A/s. What is the induced emf in the entire solenoid
A 1320-kg car is moving due east with an initial speed of 25.3m/s. After 11.5 s the car has slowed down to 15.2 m/s. Find the magnitude of the net force that produces the deceleration.
What is the minimum coefficient of friction between tires and road that will allow cars to negotiate the turn without sliding off the road.
While in Europe, a tourist hears on the radio that the temperature that day will reach a high of 18 C. What is this temperature on the Fahrenheit scale?
An electron is released near a (a) point charge, (b) an charged line of infinite length, or (c) an infinite charged plane. In which of these cases does the electron undergo constant acceleration?
a device has a 100 g wooden shuttle that is pulled horizontally along a square frictionless wooden rail by an elastic
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