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An 30-kg person puts on a life jacket, jumps into the water, and floats. The jacket has a volume of 3.4 x 10-2 m3 and is completely submerged under the water. The volume of the person's body that is under water is 6.5 10-2 m3. What is the density of the life jacket?
You use a concave mirror to focus the light from the sun to a small point. Is this point located at the focal point, further from the mirror than the focal point, or closer than the focal point? Explain
Physicians perform needle biopsies to sample tissue from internal organs. A spring-loaded gun shoots a hollow needle into the tissue; extracting the needle brings out the tissue core. Find the impulse imparted by the tissue
The most intense beam of light that can propagate through dry air must have an electric field whose maximum amplitude is no greater than the breakdown value for air: Eair max = 3.0 x 106 V/m, Calculate the intensity of this wave
equal and opposite 5 muc point charges are located at the points y plusmn .5 mm 5 muc at y .5 mm and -5
a point charge of 2.9 micro-coulombs is placed next to an infinite sheet with a surface charge density of 7.8
the flywheel of a car engine is a solid disk with a mass of 8.7 kg and a radius of 22 cm and is rotating at 4000 rpm.
The bottom of an aluminum pot has an area of 187 cm2 and a thickness of 5.25 mm. How many watts are needed to boil water at this rate
A spring with spring constant 14 hangs from the ceiling. A ball is attached to the spring and allowed to come to rest. It is then pulled down 3.0 and released. The ball makes 17 oscillations in 16 seconds. What is it the mass of ball.
Suppose you are old and as a last act want to see for yourself what it is to cross an event horizon (knowing you cannot come back). To get there, though, you have to survive the tidal forces.
Every year, there is a foot race to the top of the Empire State Building. The vertical distance traveled (using the stairs!) is about 440 m. what was his average power output during the race
A telephoto camera lens system needs to be able to form reasonably sized images of distant objects, Find the height of the final image formed by the two lenses. Is it upright or inverted
a 2.0-nf parallel plate capacitor with a sheet of mylar k 3.1 filling the space between the plates is connected to a
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