## Search found 3 matches

September 5th, 2018, 6:39 pm
Forum: 2019 Question Marathons
Topic: Sounds Of Music C
Replies: 120
Views: 15762

### Re: Sounds Of Music C

Hi there, here is my answer: forgive my formatting Answer|dB = 10 log I / I (threshold intensity ) = 10 log 4(1 x 10^-4 W/m^2) / 1 x 10^-12 W/m^2 = 86dB, so final is 86dB Here is my question : A soprano saxophone is considered an open pipe resonator. If the pipe was straightened out it would be 65 ...
September 5th, 2018, 4:29 pm
Forum: 2019 Question Marathons
Topic: Thermodynamics B/C
Replies: 127
Views: 13916

### Re: Thermodynamics B/C

Find the work performed by 2.5 moles of oxygen isothermally expanding at 25◦C from 1.5 atm to .75 atm of pressure.(Answer preferred in Joules). Generally, the person who answers asks the question, but it's fine. P = \frac{(2.5 mol)R(298.15 K)}{V} V_i = \frac{(2.5 mol)R(298.15 K)}{1.5 atm} V_f = \fr...
September 5th, 2018, 4:06 pm
Forum: 2019 Question Marathons
Topic: Thermodynamics B/C
Replies: 127
Views: 13916

### Re: Thermodynamics B/C

Find the work performed by 2.5 moles of oxygen isothermally expanding at 25◦C from 1.5 atm to .75 atm of pressure.(Answer preferred in Joules).