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Unpolarized light incident through a polarizer passes through a second polarizer placed at an angle theta to the first. The final intensity of the light that emerges after traveling through the two polarizers is 20% of the original intensity. How much is theta? Give your answer in degrees.
A person 25 centimeters in front of a concave makeup mirror sees an upright image magnified by a factor of two. Draw a sketch to locate the image of the person
a 40 g block of of ice is cooled to -72 C and then is added to 650 g of water in an 80 g copper calorimeter at a temperature of 24C, determine the final temperature of the system consisting of the ice
A. 0.145 kg baseball is pitched at 42 m/s. The batter hits it horizontally to the pitcher at 58 m/s. What is the change in momentum of the ball
A softball, of mass m = 0.183 kg, is pitched at a speed v0 = 26.9 m/s. Due to air resistance, by the time it reaches home plate it has slowed by 11.9%. Calculate the average force of air resistance
A car with a mass of 980 kg is initially traveling east toward an intersection with a speed of vc = 20.8 m/s, Determine the initial speed of the truck and the final speed of the wreckage
For the transmutation reaction 1H + 93Y -> ___ + 4He, What is the element abbreviation of the daughter atom
Electrons are accelerated from rest through an electric potential difference of 250kV, then the potential difference is changed to 60kV. What is the ratio of the two de Broglie wavelengths produced by the electron
A planet orbits a star once every 3.44 multiply.gif 107 s in a nearly circular orbit of radius 1.46 multiply.gif 1011 m. determine the tangential speed of the planet
The acceleration of a system of two masses of 15kg and 20kg, both connected by a rope and moving on a horizontal plane, is 5m/s^2.Determine the force that acts on the system.
A number of people are riding in a hot-air balloon. The combined mass of the people and balloon is 281 kg. The balloon is motionless in the air, since the downward-acting weight of the people and balloon is balanced by an upward-acting 'buoyant' f..
A science student is riding on a flatcar of a train traveling along a straight horizontal track at a constant speed of 12.9 m/s. How high does the ball rise
A molecule of DNA (deoxyribonucleic acid) is 2.35 µm long. The ends of the molecule become singly ionized: Determine the effective spring constant of the molecule
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