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A streetlight contains two identical bulbs 3.3 m above the ground. If the community wants to save electrical energy with removing one bulb, how far from the ground must the streetlight be positioned to have the same illumination on the ground under the lamp?
To some extent, the brilliance of diamonds is attributal to total internal reflection. Calculate the critical angle for a diamond-air interface
A single-turn circular loop of radius 8.00 cm is to produce a field at its center that will just cancel the earth's field of magnitude 0.7G directed at 70 below the horizontal north direction. Find out the current in the loop.
a small ferryboat is 4.00 m wide and 6.00 m long. when a loaded truck pulls onto it the boat sinks an additional 4.20
An iron casting containing a number of cavities weighs 20052.8 N in air and 16121.0 N in water. What is the total volume of all the cavities in the casting
A michelson interferometer is used with a helium-neon laser of wavelength 628.8 nm. A glass-walled chamber of interior length 1.005 cm is placed in one of the beams and the position of the mirror is adjusted until bright light is observed at the dete..
The planet mars hass a mass of 6.42x10^23kg and a radius of 3396km. What escape speed is needed for a space ship leaving the surface of Mars
Given that 12g of carbon combines with 16g of oxygen to form carbon monixide, how various grams of carbon monoxide can be made from 48g of carbon and 48g oxygen.
If a 120g mass was placed at the 25cm mark, and a 20 g mass at the 12 cm mark, where must a 500 g mass be placed to balance the system?
Draft Hypothesis and Design
Because of salt content, the density of the water in the Dead Sea (Middle East) is greater than ocean water. Air pressure (at sea level) is 1.013 x 105 Pa. Calculate the density of the water in the Dead Sea in kg/m3. g = 9.8 m/s2
If lithium ion Li+2 is treated as a classical system of one electron of charge ?e going around a nucleus of charge 3e on a circle of radius 1.77× 10?11 m, find the ionization energy of the electron
Starting from rest, you move with a constant acceleration of 2.1 m/s2 for 13.0 s and then move with an acceleration of -2.1 m/s2, What is your maximum speed attained
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