A box is against a wall. A person pushes on the box, but the box does not move. Is this situation an example of a force?
No, this is not an example of a force because the box did not move.
Yes, this is an example of a force because gravity is pulling the box down.
о
No, this is not an example of a force because a force pulls an object.
Yes, this is an example of a force because a force is a push or pull.

Wo audio speakers are placed on a vertical rail. speaker a is placed at head-level while speaker b is place at some variable height, \delta yδy, above speaker a. both speakers receive simultaneous input from a sine-wave generator so the speakers each produce a pure sinusoidal sound wave with a wavelength of 0.531 meters. calculate the lowest height that speaker b can be placed above speaker a to produce a minimum of sound heard by person standing \delta x = 7.86δx=7.86 meters directly in front of speaker a.

How many seconds does it take a pebble released from rest off a bridge to fall 29.4 m ? what is the pebble's speed when it has fallen 29.4 m ?

What are igneous intrusions and extrusions