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The earth's magnetic field, with a magnetic dipole moment of 8.0×10^22 A*m^2 , is generated by currents within the molten iron of the earth's outer core. (The inner core is solid iron.) As a simple model, consider the outer core to be a current loop made of a 1100-km-diameter "wire" of molten iron. The loop diameter, measured between the centers of the "wires", is 3100km.
Part A What is the current in the current loop? Express your answer using two significant figures.
A spotlight sends red light (wavelength = 694.3 nm) to the moon. At the surface of the moon, which is 3.77 multiply.gif 108 m away, Determine the diameter (not the radius) of the central bright spot on the moon
The cheetah can reach atop speed of114km/h (71mi/h). While chasing its prey in a short sprint, find the cheetah's average acceleration during the short sprint
Many nuclear reactors use heavy water moderators in which elastic collisions occur between neutrons and deuterons of mass 2.0 u. What is the speed of a neutron, expressed as a fraction of its original speed
A child of mass m sits in a swing supported by two chains, each of length R. The tension in each chain at the lowest point is T. Find the child's speed at the lowest point
A space traveller weighs herself on Earth, at a location where the acceleration due to gravity is 9.82 m/s2, and finds a value of 571 N. What is the traveller\'s mass on the planet
Electrons are ejected from a metallic surface with speeds ranging up to 4.60 × 105 m/s when light with a wavelength of 625 nm is used. What is the cutoff frequency for this surface
Find out the minimum acceleration of the antelope.
An 800 kg car moving at 6 m/s begins to coast down a hill 40m high with its engine off. How much energy was lost to friction
How much work would be required to move a 0.50 microCoulomb test charge from a point midway between them to a point 12 cm closer to ether of the charges?
A laser that produces a spot of light that is 1.25 mm in diameter is shone perpendicularly on the center of a thin, what is the power of the laser
A 4 kg ball is raised a vertical distance of 2 meters. Using the conservation of energy principle calculate the final speed of the ball right before it hits the ground
A cord of length 1.5 m is fixed at both ends. Its mass per unit length is 1.2 g/m and the tension is 12 N. Calculate the frequency of the fundamental oscillation
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