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A water supply maintains a constant rate of flow for water in a hose. You want to change the opening of the nozzle therefore that water leaving the nozzle reaches a height that is nine times the current maximum height the water reaches with the nozzle vertical. To do so, what must you do?
Decrease the area of the opening by a factor of 81
Decrease the area by a factor of 18
Decrease the area by a factor of 9
Decrease the area by a factor of 3
Give up because it cannot be done
a system of 1435 particles, each of which is either an electron or a proton , has a net charge of -7.216x10^-17, how many electrons are in this sytem
A cubical piece of heat-shield tile from the space shuttle measures 0.11 m on a side and has a thermal conductivity of 0.059 J/(s m ·C°). How much heat flows from the outer to the inner surface of the tile in six minutes
A toaster uses a Nichrome heating wire. When the toaster is turnedon at 20° C, the initial current is 1.50 A. A few secondslater, the toaster warms up and the current now has a value of 1.28A.
Write your answer in scientific notation and show all your calculations.
a conducting sheet carries a surface current density of k amperesmeter. there are no other currents in the vicinity.a-
A magnetic field of 1.4 T is perpendicular to a square coil of 14 turns. The length of each side of the coil is 4 cm. Discover the magnetic flux during coil. Find the magnetic flux during the coil if the magnetic field makes an angle of 45? with the ..
Two identical springs (neglect their masses) are used to "play catch" with a small block of mass 110g, Determine the spring constant of the two springs
A converging lens has a focal length of f = 43 cm for blue light and f = 53 cm for red light. An object is placed 140 cm in front of the lens and is illuminated with white light. Chromatic aberration causes the image formed with blue light to be a..
A simple pendulum has a period of 2.5 s. What is its period if its length is made four times larger
two parrel,very long straight wires separated by 10 cm are carrying 2.0 A and 4.0 A in opposite direction. where the magnetic field is Zero
A spherical balloon has a radius of12.5m, and is filled with helium. How large a cargo can it lift, assuming that the skin and structure of the balloon have a mass of600kg
A carbon sample of the same size taken from a fresh piece of bone emits 16 beta emissions a minute. How long ago did the saber-tooth tiger live?
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