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A siren is made by blowing a jet of air through 20 equally spaced holes in a rotating disk. The time it takes for successive holes to move past the air jet is the period of the sound. The siren is to produce a 2200 Hertz tone. Compute what must be the angular speed ω (in rad/s) of the disk?
Consider a Hydrogen atom with the electron in the n = 8 shell. What is the energy of this system, How many subshells are in this shell
A skier is gliding along at 4.72 m/s on horizontal, frictionless snow. He suddenly starts down a 19.2° incline. His speed at the bottom is 27.8 m/s. What is the length of the incline?
A component with 19 Ω resistor is rated for use at power levels not exceeding 11 w. find how much current safely flow through the component
A string on a string bass is tuned to vibrate at a fundamentalfrequency of 53.0 Hz. what would be the new fundamental frequency
On a cold winter's day, heat leaks slowly out of a house at a rate of 20.0kW. find the rate of entropy increase
in order to improve sharpness of pictures photographers sometimes decrease lenss aperture i.e. cover part of the lens.
A plot of pressure as a function of volume is known as a pV diagram. pV diagrams are often used in analyzing thermodynamic processes. Consider an ideal gas that starts in state O, as indicated in the diagram. Your task is to explain how the gas proce..
Some good estimates about the human body can be made if it isassumed that we are made mostly of water. The mass of a water molecule is 2.99*10-26 kg. If the mass of a personis 51 kg, estimate the number of water molecules in that person.
What would be the required internal diameter of a fluid conductor, assuming no friction losses, if the conductor willbe required to handle a fluid flow of 110 gal/min. At a fluidvelocity of 14.8 ft/sec.
A person whose mass is m = 97.0 kg steps on a mechanical bathroom scale placed on an inclined plane that makes the angle ? = 25.3° with the horizontal
You are using a grating with 1000 lines per millimeter; the angle for the first order maxima is ? = 17°. Find the angle of the second order maxima
A fish swimming in a horizontal plane has a velocity vi = (3.3i + 1.6j) m/s at a point in the ocean where the position relitive to a certian rock is ri = (10.5i - 3.9j) m. After the fish swims with a constant acceleration for 20.6 s, it's velocity..
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