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A straight 2.00-m, 150-g wire carries a current in a region where the earth's magnetic field is horizontal with a magnitude of 0.55 gauss. a) What is the minimum value of the current in this wire so that its weight is completely supported by the magnetic force due to earth's field, assuming that so other forces except gravity act on it? Does it seem likely that such a wire could support this size of current ? b) Show how the wire would have to be oriented relative to the earth 's magnetic field to be supported in this way?
The position of a particle moving along the x axis is given by x = (32 + 40t - 8.0t2) m, where t is in s. What is the average velocity during the time interval t = 1.0 s to 3.0 s?
A potential difference of 81 mV exists between the inner and outer surfaces of a cell membrane. The inner surface is negative relative to the outer surface. How much work is required to eject a positive sodium ion (Na+) from the interior of the ce..
A rectangular block of wood (M = 219 kg) floats on a calm fresh water lake with do = 22.7 cm below the water. Find the mass of the dog
A train travelling at 50.0 km/h approaches another train moving toward the first at 90.0 km/h, if they are 35 km apart on a straight track how long does it take before they meet
A billiard ball of mass m = 0.25 kg strikes the cushion of a billiard table at θ1 = 52 ° and a speed v1 = 27 m/s. What is the magnitude of its change in momentum
A 4.4-m-diameter merry-go-round is initially turning with a 4.5s period. It slows down and stops in 16s. what is the speed of a child on the rim
Compressed air can be pumped underground into huge caverns as a form of energy storage. how many homes could this internal energy serve for one day
A Na+ ion moves from inside a cell, where the electric potential is -68 mV, to outside the cell, Does its energy increase or decrease
The blades in a blender rotate at a rate of 6440 rpm. What is the angular acceleration as the blades slow down
Amtrak's 20th-Century Limited is en route from Chicago to New York at 120km/h, How far was the train from the cow when the engineer first applied the brakes
A charge q = +929 ?C is uniformly distributed on a thin nonconducting ring of mass m = 0.60 g and radius r = 2.60 cm. What is the final angular velocity of the ring
An LC circuit consists of a capacitor, C = 3.52 µF, and an inductor, L = 4.22 mH. The capacitor is fully charged using a battery and then connected to the inductor. Determine the resistance of the resistor
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