Recent content by mortho

i just submitted and it was correct. THanks for your help :)

Is it 108 Hz?

Thanks! I'm also having major trouble with an intensity problem, can you help me with that? Thanks!

Yeah, i was in a rush when i posted that because my computer's being repaired and I'm at the library and time was running out. Here's my work I used relative intensity=10log (I/Io) 114=10log(I/1e-12) and got 0.251 w/m2 for I. I do not know what to do after this.

While i was waiting i looked over it again and this is what i did for another answer i got F(listener behind)=F(of source) [v/v+v(source)] I did one for each since there are two trains. For the train on rest, i did F(listner behind)=282*[343/(343+0)] which is 282 Hz For the train...

Homework Statement Two trains emit whistles of the same frequency, 282 Hz. If one train is at rest and the other is traveling at 45 km/h away from an observer at rest, what beat frequency will the observer detect? Homework Equations The Attempt at a Solution I used listener...

Homework Statement A person standing a certain distance from an airplane with four equally noisy jet engines is feeling a sound level intensity bordering on pain, 114 dB. What sound level intensity would this person experience if the captain shut down all but one engine? I have no idea...

thanks!

Homework Statement An elastic cord is 67 cm long when a weight of 57 N hangs from it and is 80 cm long when a weight of 79 N hangs from it. What is the "spring" constant of this elastic cord? Homework Equations F=-Kx The Attempt at a Solution I substituted the numbers into the...

Homework Statement A wave traveling in the positive x direction with a frequency of 19.0 Hz The full amplitude of the wave is 0.18 m and the wavelength is 0.20 m What is the period and speed of the wave? Homework Equations speed=(frequency)*(wavelength) Frequency=1/period The...

Thanks! :)

so it's just 2354 kg?

But isn't that f=ma which is force?

Homework Statement A geosynchronous satellite is used for communication and stays at the same place above the equator all the time. Calculate the a)Height of the satellite b)Speed at which it travels. Homework Equations v=2πr\t a=v2/r F=Gm1m2\r2 The Attempt at a Solution I'm...

so what you're saying is (240)(9.81)=(6.67e-11)(m)\34830000squared ?? i solved and got 4.28e28 kg.