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Aluminum wire has been utilized to replace copper wire during times of high copper prices. if 20 gauge copper wire has a resistance of33Ω per kilometre of length, decide the diameter of an aluminum wire with similar resistance?
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..
a carnot refrigerator is operated between two heat reservoirs at temperatures of 320 k and 265 k.if in each cycle the
You lay a mirror flat on the floor with one edge against a wall and aim a laser at the mirror. Find the angle of incidence of the laser ray on the mirror
if 590 nm light falls on a slit 4.40times10?2 mm wide what is the full angular width of the central diffraction
A patient is to be given a blood transfusion. The blood is to flow through a tube from a raised bottle to a needle inserted in the vein. How high h should the bottle be raised above the needle
a laser emits at 424nm in a single pulse that lasts .500 x10-6s. the power of the pulse is 2.80 mw. if we assume that
An ideal fluid, of density 0.85 x 10^3 kg/m^3, flows at 0.25 kg/s through a pipe of radius 0.010 m. What is the fluid speed
A heater coil connected to a 240 Vrms ac line has a resistance of 34 Ohms. find min values of the instantaneous power
You bring a 350-g wrench into the house from your car. The house is 15 C warmer than the car, and it takes 2.52 kJ of energy to warm the wrench by this amount. Find (a) heat capacity of the wrench and (b) specic heat of the metal it's made from.
an antelope moving with constant acceleration covers the distance 66.0m between two points in time 6.80s. its speed as
Monochromatic light strikes a diffraction grating at normal incidence before illuminating a screen 3.00 m away. what is the distance between the two second-order maxima
A window has a glass surface are of 1.6x10^3 cm^2 and a thickness of 3.0 mm. Find the rate of energy transfer by conduction through the window when the temperature of the inside surface of the glass is 70F and the outside temperature is 90F.
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