Recent content by EroAlchemist

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    Calc Volume and Temp of gas with changing conditions

    Homework Statement If 18.75 mol of helium gas is at 10.0C and a gauge pressure of 0.035atm, calculate a) the volume of the helium gas under these conditions. b) calculate the temp if the gas is compressed to half the voume at a gauge pressure of 1.00atm. Homework Equations PV=nRT...
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    Calculate density of Oxygen at STP

    Homework Statement Calculate the density of Oxygen at STP using the ideal gas law Homework Equations PV=nRT The Attempt at a Solution n = (X grams Oxygen / 16g/mol Oxygen) I set V = to 1 m3 P = 1 atm R = 8.315 J/Mol K T = 273 K PV = nRT PV/RT = n 1/(8.315*273) = X grams...
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    How Is the Spring Constant Calculated for Car Vibrations?

    Thanks tvavanasd - Got it now! EA
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    Calculate frequency based on change in hanging mass

    Thanks tiny-tim! I used f = (1/2π)(√1/.22kg) = 3.35 Hz That's a closer answer to the book's 3.8Hz answer. However, by not figuring k using the information that the .60kg weight made the spring oscillate at a frequency of 3Hz, I'm not sure how to use the information about the .60kg weight and...
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    Calculate frequency based on change in hanging mass

    Homework Statement An elastic cord vibrates with a frequency of 3.0 Hz with a mass of 0.60kg is hung from it. What is its frequency when only 0.38kg hangs from it? Homework Equations freq = (1/2Pi)*sqrt(k/m) The Attempt at a Solution freq = 3.0Hz = (1/2Pi)*sqrt(k/0.60kg) =...
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    How Is the Spring Constant Calculated for Car Vibrations?

    Homework Statement The springs of a 1500kg car compress 5mm when its 68kg driver gets into the drivers seat. If the car goes over a bump what will be the frequency of the vibrations? Homework Equations Spring force = F = -kx Time = (4pi^2)(m/k) Freq = 1/T The Attempt at a...
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    Box slides down incline, air resistance does work. Find Velocity.

    Thanks for the help! I added the work this time and got the correct answer.
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    Box slides down incline, air resistance does work. Find Velocity.

    Homework Statement A 38.7g box slides down an incline of height 12.5m. As it slides, air resistance does -3.71J of work. Find the speed at which it reaches the bottom of the incline. Homework Equations E kinetic at bottom = E potential at top - Work air resistance 1/2 mv2 - 1/2...
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    Calcuate Elastic Modulus of metal cable

    Thanks - I'll check them again. :)
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    Calcuate Elastic Modulus of metal cable

    Homework Statement A mass of 225 kg is hung from a metal cable of length 1.60m and diameter 8.20mm. This causes the cable to stretch by an amount 0.668mm. Calculate the Elastic Modulus of the metal. Homework Equations E=(F/A)/(change L / orig L) The Attempt at a Solution F =...