. An electric geyser was used 2 hours a day once a week. The power rating of the geyser is 2000 watts. Calculate the annual energy consumption of
the geyser​

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.

Explain the consequences of this addiction to the brain tissue

What do you think car designers do if the damage caused by a crash test is too severe?