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How many square meters of PV would it take to provide 1 kW for a world population of 6 billion? If these cells were crystalline silicon of 200 microns thick(200*10^-6), what is the minimum mass of silicon material needed for this venture? (Density of silicon=2330kg/m^3)
As an electron in a cold hydrogen atom "flips" to align its magnetic moment with the B-field that surrounds its proton, Calculate the frequency and energy of this photon
Two identical spheres are made of conducting material. Initially, sphere 1 has a net charge of 33Q and sphere 2 has a net charge of -18 Q
Find the magnitude of the acceleration for an electron in a uniform electric field with a magnitude of 122 N/C.
A converging lens of focal length 7.99 cm is 19.7 cm to the left of a diverging lens of focal length -6.02 cm, Calculate the magnification of the coin's final image
A device uses a Stirling cycle on 433 moles of a monatomic ideal gas between two reservoirs with temperatures of 416 K, How much work is done by the device on the gas
Given two parallel plate capacitors 1 and 2. They both have a plate-charge Q and plate area A. Determine the ratio of the polarized charge q1/q2
A person works in a room for 4 hours with an activity of 3000 Bq/cubic meter of strontium chloride suspended in the air. Estimate the CEDE using the DAC. Calculate the CDEs to red bone marrow and the bone surfaces.
A merry-go-round (I= 500 kg m^2) of radius R = 2 meters is rotating about a frictionless pivot, making one revolution every 5 seconds. Find the new angular speed of the merry-go-round
charges of 6.0 x 10-7 c are each located at three corners of a square that is 1.0 m on each side. a charge of -1.3 x
find the tangential and centripetal components of the net force exerted on a car (by the ground) when its speed is 38 m/s, and it has accelerated to this speed from rest in 9.5 s on a curve of radius 370 m. The car's mass is 1000 kg.
A flight attendant pulls her 69N flight bag a distance of 246m along a level airport floor at a constant velocity. The force she exerts is 37N at an angle of 58° above the horizontal. Find the coefficient of kinetic friction between flight bag and..
question1a dockworker applies a constant horizontal force of 76.0n to a block of ice on a smooth horizontal floor. the
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