Recent content by duoheer

Let's say we have a charged plastic rod and a neutral metal ball, and a charged metal rod and neutral metal ball, which rod can transfer more charge onto the metal ball? Or metal ball onto the rod (if the rods are positive) Thank you

Homework Statement I read this question online. Estimate the length of your ear canal. Regard the canal as a narrow tube that is open at one end and closed at the other, at approximately what fundamental frequency would you expect you hearing to be most sensitive? Explain why you can hear...

I read this question online. Estimate the length of your ear canal. Regard the canal as a narrow tube that is open at one end and closed at the other, at approximately what fundamental frequency would you expect you hearing to be most sensitive? Explain why you can hear especially soft sounds...

How do you calculate the centripetal force in pendulums? THx

Hey guys, I have 2 questions: 1. If you press the loudness pedal on a piano and sing a note, a sound usually comes from the piano, why? 2.With a trombone, a skilled player will produce an attractive sound, whereas an unskilled player will produce an unattractive sound while playing the same...

Hey, wat are the differences among the following? 1.intensity of a sound wave 2.loudness of a sound wave 3.quality of a sound wave And also,can u give me an experiment that would determine whether sound can travel thru a vacuum? thank you guys so much

Hey guys, what is the name of the device that display sound waves as transverse waves on a screen? Thanks

How could you tell if you had missed one of the natural frequencies when you were finding natural frequencies above the fundamental? thnx a lot

An electric iron marked 1000W, 240V is wrongly connected to a 120V mains.What is the power dissipated by the iron? thanx

When a bar magnet (one with Npole n the other with S pole) is broken into 2 pieces, wat poles do the pieces have? thanx

Hey ppl. For the magnetic fileld of a current-carrying coil, what are the factors that affect the strength of the magnetic field due to the coil? THANKS:biggrin:

If the size of a magnet does not determin its strength, then what physical property does? THANX:smile:

what is the difference between "work done on the object" and "work done by the net force"? if there is a difference, can u give me an example? thanks thx