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Homework Help for Physics
Physics is the study of matter, motion, energy and force. It is a fundamental science that seeks to understand and explain the universe around us and beyond.
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(a) An ideal gas occupies a volume of 3.0-cm3 at 20Â°C andatmospheric pressure. Determine the number of molecules of gas inthe container.
(b) If the pressure of the 3.0-cm3 volume is reduced to 2.8 10-11Pa (an extremely good vacuum) while the temperature remainsconstant, how many moles of gas remain in the container?
<p>Rubidium atoms are cooled to 0.16 μK  inan atom trap. What is their de Broglie wavelength?</p>
<p>I used λ=h/√(2πmkT)and got 4.698x10^-7 m but it was wrong. Can't figure out for thelife of me what I did wrong. I converted mass to kg from amu, Kfrom μK, and used the correct constants(6.626e-34;1.38e-23)</p>
A cylindrical metal shell with inner and outer radii of 0.200m and0.300m, respectively, carries a net charge of 4.0 x 10^-8 C/m.Along its center there is a wire with a uniform charge of -12.0 x10^-8 C/m. (This system is similar to an electrostatic aircleaner.)
Q - Find the electric potential caused by this system of electriccharges, using the outer surface of the shell as a reference pointfor the potential.
Please show all steps clearly and thanks for your help!!
1 N m
(b) Straight, but 50Â° belowhorizontal
<p>A Pyrex flask in a refrigerator at 1 degree Celsius isfilled to the top and holds exactly 1000 cm^3 of ethylalcohol. </p>
<p>If the refrigerator fails, how much alcohol spills by thetime the temperature reaches 33 degrees Celsius? (The coefficientof volume expansion of ethyl alcohol is .00112 Degrees Celsius ^-1.Ignore the expansion of the flask). </p>
<p>Answer in units cm^3</p>
A bus has helper springs with k1= 1x10^5(#/ft) and regular leafsprings that have k2= 0.6x10^5(#/ft). I place a load of 16,000# onthose springs. (a) If there is no free space between the leaf andthe air helper spring, how far will the leaf springs displacedownward with this load? (b) How far down, under the samecircumstances, would the air-bag overload spring compress?
answer must have following format: 1.formula used
2.numbers plugged into formula
"1.) Calculate the pressure at the end of a hose if it is 3 m belowthe bottom of a bucket flled with water to a height of .25 m abovethe bottome of the bucket.
2.) Given two hydraulic cylinders connected by a 5 mm hose onemeter long. The bore diameter of cylinder one is 25 mm and the borediameter of cylinder two is 75 mm. If a force of 30N is applied tocylinder one, how much mass can cylinder two support?
3.) Given a body at 50 degrees C with a surface area of 0.15 meterssquared and an emissivity of 0.7, calculate the rate of radiantenergy leaving the body.
4.) If a bus is moving toward you at a velocity of 60 km/hr, youare moving away from it at 3 m/s, what will be the observedfrequency of its horn if it is 700 Hertz at rest? The velocity ofsound is 320 m/s.
5.) What is the beat frequency of mixing three tuning forks, one at762 hertz, one at 767 and one at 770 hertz?
6.) What is the decibel level of a sound with an intensity of 2.3 X10 w/exponent -10 w/m squared?"
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