Classical Mechanics Answers

Show that only odd integral multiples of
fundamental frequency are excited in a
closed pipe.

Sound source A ls located at x = 0, y = 0, and sound source B is located at x = 0, y 3.4 m. The two sources radiate coherently and in phase. An observer at x = 17.4 m, y 0 notes that as he takes a few step5 from y 0 in either the ty or -y direction, the sound intensity increases. What is then the lowest frequency and next to lowest frequency of the sources that can account for this observation? (Enter your answers from smallest to largest.) 1.04 x kHz kHz

A factory siren has a frequency of 990 Hz. Calculate the frequency heard by a person sitting in a car moving at 72 kmh-1 (i) away from the siren and (ii) towards the siren. Take the speed of sound in air as 330 ms-1.

When we keep pushing a box continuously it moves with us
But when we stop applying force it also stops
So my question is that does that box stops because we have removed force
Or stops due to friction
Pls explain

When we switch off the fan why it moves still and then eventually comes too rest instead of coming to rest suddenly ?

A particle of mass m and charge q is moving along the x-axis with
speed u when it passes between two charged parallel plates. The plates generate a uniform
electric field E_0 j in the region 0 ≤ x ≤ b and no field elsewhere. Find the angle through which the particle is deflected by its passage between the plates.

A positively charged rod is used to give a metal sphere a positive charge. What is the metal sphere charged by?

A positive charge exerts a 5.0-N force on a negative charge. What force does the negative charge exert on the positive charge?

A 1.2-C charge is placed in an electric field with a strength of 0.15 N/C. What force does it feel?

When you put two charged objects that are free to move near one another, you can calculate the force the exists between them, but it only lasts for one instant. Why?