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Magnetoencephalography (MEG) is a non-invasive method for studying electrical activity in the brain. It is based on the principle that an electric current creates a magnetic field, whether the current is in a wire, or in the neuron of a brain. Thus, your very thoughts at this moment are generating measurable magnetic fields outside your head! With today's technology, an MEG can detect fields as small as 1.2×10?15 T. The electric current needed to produce the magnetic field strength at a distance of 4 cm is 2.4x10^-10 A.
Assume this current to flow in the same direction in two neurons, which are parallel over 1.0 cm and separated by 0.70mm . What is the force between the two neurons?
Is it an attractive or repulsive force between these two neurons?
a rocket with inital mass 1000 kg adjusts its thrust byvarying the rate at which mass is ejected. the ejection speedrelative to the rocket is 30 km/s. find at what rateis mass being ejected at that instant
The power capacity for all nuclear power plants in the United States is 1.01E5 MW. In one hour, what is the total change in the mass of the nuclear fuel
a 0.1kg ball moving at 10 m/s collides with a 1 kg block that is initially at rest. Find the ratio of the kinetic energies of the two objects after collision
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A rock with mass 2.0 kg is projected from the ground with an initial velocity that has magnitude 14.0 m/s, what is the gravitational potential energy of the rock
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The period of the earth around the sun is 1 year and its distance is 150 million km from the sun. An asteroid in a circular orbit around the sun is at a distance 461 million km from the sun. What is the period of the asteroid’s orbit?
Two loudspeakers in a plane, 6.0 apart, are playing the same frequency. If you stand 14.0 in front of the plane of the speakers, What is the frequency of the sound
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