Pleaaeseee help me. eee A sound is heard by a listener at A, who is 21 m from the clarinet.
(i) The clarinet starts to make a note of frequency 220 Hz.
Calculate how many vibrations the reed makes before the sound reaches the listener

The speed of sound in air is 330 m/s.

A3.9 g aluminum foil ball with a charge of +4.1×10−9 c is suspended on a string in a uniform horizontal e⃗ field. the string deviates to the right and makes an angle of 30∘ with the vertical. part a part complete what information about the e⃗ field can you determine for this situation? what information about the field can you determine for this situation? only the magnitude of e⃗ only the direction of e⃗ both the magnitude and the direction of e⃗ none of the above previous answers correct part b determine the magnitude of the electric field. express your answer with the appropriate units. e e = nothing nothing request answer part c determine the direction of the electric field. determine the direction of the electric field. to the right to the left away from you toward you

We put a force of 50n on an object and the acceleration is 100 m/s². what is the mass of the object?

Alarge box of mass m is pulled across a horizontal frictionless surface by a horizontal rope with tension t. a small box of mass m sits on top of the large box. the coefficients of static and