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Unpolarized light of intensity I0 is sent through 4 polarizers, each of the last three rotated 30o from the previous polarizer so that the last polarizer is perpendicular to the first. What is the intensity transmitted by this system?
1) 0.75 I0
2) 0.50 I0
3) 0.42 I0
4) 0.21 I0
5) 0.00
A 768 kg car moving at 27 m/s brakes to a stop. The brakes contain about 16 kg of iron that absorb the energy. What is increase in temperature of the brakes
Young David who slew Goliath experimented with slings before tackling the giant. He found that he could revolve a sling of length 0.450 m at the rate of 10.0 rev/s. What is the speed of the stone for each rate of rotation
suppose one of the resistor in the bridge circuit was heated by baking it in an oven. how would this effect the current
Two Capacitors, C1= 2.0 mF and C2=9.0 mF , are in a series. Find the potential difference across the second capacitor
a boy weighing 3.9 102 n jumps from a height of 1.80 m to the ground below. assume that the force of the ground on his
Sound travels at a speed of about 344 m/s in air. You see a distant flash of lighting and hear the thunder arrive 7.6 seconds later. How many miles away was the lighting strike
A 1.0 µCi 13755Cs source is used for 2.3 hours by a 80 kgstudent in a physics lab. Radioactive 13755Cs decays by ß- decay with a half-life of 30 years. The average energy of the emitted betas is about 190 keV per decay. The ß decay is quickly foll..
A 1 inch diameter hose has water flowing though it at 30 meter per second. If the hose is narrowed to 1/2 inch diameter, find what will be the flow rate through narrowed hose
A sun yacht is a spacecraft with a large sail that is pushed by sunlight. Although such a push is tiny in everyday circumstances, What is the magnitude of the resulting acceleration
There are 3.344 x 10^25 molecules in 1 kg (1 litre) of water. What is the distance between the molecules
Two metal spheres of different sizes are charged such that the electric potential is the same at the surface of each. Sphere A has a radius 7 times that of sphere B. Let and be the charges on the two spheres, and let and be the electric-field magnitu..
A steel ball bearing 7.0 mm in diameter is dropped into a cylinder of glycerin. What is the terminal velocity of the ball bearing
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