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Two polarizers are oriented at 38 deg to one another. Lightpolarized at a 19 deg angle to each polarizer passes through both. What percent reduction in intensity takes place?
A child stands at the rim of a rotating merry-go-round of radius 2.8 m. The child has a mass of 51.0kg, and the carousel turns with an angular velocity of 2.3 rad/s. What minimum coefficient of static friction is required
q1. a person with a mass of 103 kg is standing on a scale that reads weight in newtons inside of an elevator. if the
a projectile is fired with an initial velocity of 15 m/s at an angle of 37 degrees. At t=2 s, find the vertical and horizontal positions of the projectile
A basketball star covers 2.6 m horizontally in a jump to dunk the ball. His motion through space can be modelled precisely as that of a particle at his center of mass. His center of mass is at elevation 1.02m when he leaves the floor. It reaches a..
1.4m/s is a typical walking speed. At what temperature would nitrogen molecules have an rms speed of 1.4 m/s
q1. to push a 47.0-kg crate up a frictionless incline angled at 34.0deg to the horizontal a worker exerts a force of
A small sphere of mass m= 7.60 g and a charge q1 = 29.9 nC is attracted to the end of a string, what is the smallest value d can have before the string breaks
A coil of wire has a resistance of 38.0 ? at 25° C and 43.7 ? at 60° C. What is the temperature coefficient of resistivity
A 2.83-kg book slides 1.17 m along a level surface. The coefficient of kinetic friction between book and surface is0.41. Find the work done by friction
q1. an aluminum cup contains 225 g of water and a 40-g copper stirrer all at 27degc. a 400-g sample of silver at an
200 ml of coffee ( density = 1000kg/m^3 , specific heat 4186j/kg C ) is insulated in a mug at a temp of 85C. If 25ml of cream ( density of 1500 kg/ m^3 , specific heat 4500j / kg C at 10 C is added what will be the new temperature of the system?
A nearsighted person wears glasses to correct the problem. How far in cm from the eyes is the person's far point located
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