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Near Earth Near Earth, the density of protons inthe solar wind (a stream of particles from the Sun) is 8.60 cm-3 and their speed is about480 km/s.
a) Find the current density of these protons.b) If Earth's magnetic field did not deflect them, the protons would strike the planet. What total current would Earth then receive?
A laser used in eye surgery emits a 3.12 mJ pulse in 1.11 ns, focused to a spot 25.7 um in diameter on the retina. Calculate (in SI units) the power per unit area at the retina
IP Water flows through a horizontal tube of diameter 3.0cm that is joined to a second horizontal tube of diameter 2.0cm. Find the speed of flow in the first tube in m/s
A chain of length L and total mass M is released from restwith its lower end just touching the top of a table. Find the force exerted by the table on the chain
If you were to drink mercury (13.6g/cm^3) with a straw, what would be the maximum length of the straw
Two blocks, masses m1 and m2 are connected by an ideal string passing over an ideal pulley. Find the acceleration of each block
question1with ones eye at a height of 1 m above water level on a lake one can just see over the horizon a point on the
A blow-dryer and a vacuum cleaner each operate with a voltage of 120 V. Determine the ratio of the energy used by the blow-dryer in 17 minutes to the energy used by the vacuum cleaner in 46 minutes
A point charge q1 = -8.9 μC is located at the center of the thick conducting shell of inner radius a = 2.2 cm and outer radius b = 4.5 cm, the conducting shell has a net charge of q2 = 1.1 μC.
two blocks each of mass 3.05 Kg are fastened to teh top of an elevator. A if the elevator has an upward acceleration a = 1.60 m/s^2, What is the maximum acceleration can the elevator have before the upper string breaks
A machine shop has 100 equally noisy machines that together produce an intensity level of 90 dB. how many machines must be turned off
small object is placed to the left of a convex lens and on the optical axis. What is the position of the image formed by the lens
A cat walks along a uniform plank that is 4.00 m long and has a mass of 7.00kg the plank is upported by two sawhorses. What is the mass of the cat
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