You have a solenoid with a fixed number of turns connected to a power supply that can supply a fixed amount of current. To double the field inside the solenoid, you can

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.

Determine the maximum r-value of the polar equation r =3+3 cos 0

What is a possible result of higher air temperature caused by global warming