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Neurons in our bodies carry weak currents that produce detectable magnetic fields. A technique called magnetoencephalography, or MEG, is used to study electrical activity in the brain using this concept. This technique is capable of detecting magnetic fields as weak as 1.0 10-15 T. Model the neuron as a long wire carrying a current and find the current it must carry to produce a field of this magnitude at a distance of 4.6 cm from the neuron.
A research submarine has a 20-cm-diameter window that is 8.0cm thick. What is the submarine's maximum safe depth in salt water
a two-dimensional electrostatic field varies with the coordinates x and y but is independent of z. show that the
The receiver has a 22 yard lead from the quarter back by the time he throws the ball. How fast must he run in order to catch the ball when it lands
A student sees a newspaper ad for an apartment that has 1430 square feet (ft2) of floor space. How many square meters of area are there
During the collision with the ground, he comes to rest in a time of .101 s. The average force exerted on him by the ground is +18000 N, where the upward direction is taken to be the positive direction. Elucidate from what height did the student f..
positive freedom is the ability to do what one should do. negative freedom is the ability to do what one should not
A uniform magnetic field is normal to the plane of a circular loop 10 cm in diameter made of copper wire (diameter 2.5 mm). At what rate must the magnetic field change with the time if an induced current of 10 A is to appear in the loop? The resistiv..
Starting from rest, a basketball rolls from the top of a hill to the bottom, reaching a translational speed of 5.85 m/s. Ignore frictional losses. What is the height of the hill
assume the roller coaster (h1 = 34 m, h2 = 10 m, h3 = 20) passes point A with a speed of 2.00 m/s. If the average force of friction is equal to one sixth of its weight, with what speed will it reach point B? The distance traveled is 45m.
Find the angular velocity of a centrifuge in which a particle 10 cm from the axis of rotation experiences a radial acceleration of 10^3 times g
Mountaineers often use a rope to lower themselves down the face of a cliff (this is called rappelling). They do this with their body nearly horizontal, What tension does his rope need to support
two metal balls are hung from strings. the first ball 0.09 kg is pulled to the side and released so that it strikes the
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