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A coin rests on the bottom of a beaker filled with an unknown liquid. A ray of light from the coin travels to the surface of the liquid and is refracted as it enters into the air. A person sees the ray as it skims just above the surface of the liquid. How fast is the light traveling in the liquid? The distance (height) from the coin to the top of the water, along the y-axis, is 6 cm. The distance (width) from the top of the water, from top left corner, to where the angle is created, is 5 cm.
A quasar 10 billion light years from Earth appears the same brightness as a star 5.9*10^4 light years away. How does the power ouput of the quasar compare with that of the star
A radar system can measure the time delay between the transmitted and reflected wave pulses from a distant airplane with an accuracy of 1.02 picoseconds. What is the accuracy in the calculated distance to the plane
A rocket carrying a satellite is accelerating straight up from the earth's surface. At 1.10 s after liftoff, the rocket clears the top of its launch platform, Calculate the magnitude of the average velocity of the rocket
A circular coil enclosing an area of 200 cm2 is made of 210 turns of copper wire. The wire making up the coil has resistance of 3.0 ?, what is the average current in the coil during that time
Consider a wooden block of density 750 kg/m3 and volume 3.0 m3. What force is required to hold it completely under water
A 1.5m -long barbell has a 22kg weight on its left end and a 35kg weight on its right end. If you ignore the weight of the bar itself, how far from the left end of the barbell is the center of gravity
Analyse average density of the white dwarf
A 2.20 kg bucket containing 10.0 kg of water is hanging from a vertical ideal spring of force constant120 N/m and oscillating up, What is the shortest period this system can have
On an essentially frictionless, horizontal ice rink, a skater moving at 4.1 m/s encounters a rough patch that reduces her speed by 49% due to a friction force that is 26% of her weight. find the length of this rough patch
The peak wavelength for the blackbody radiation from a star corresponds to an energy of 2.92x10^ -19 J. what is the temperature of the star at the surface
Glider A with mass 0.400 kg, gliding with a velocity of magnitude 0.50 m/s on a frictionless, horizontal air track, makes a perfectly elastic head-on collision with a glider B with mass, Find the mass of the glider B
Two steel juggling balls each carry a charge of 2.75 ?C. find the distance between the centers of the two balls
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