Aracecar burns gasoline to power its engine. as the car is racing around a track, what energy is involved in the system? check all that apply.
- mechanical energy
- chemical energy
- thermal energy
- electromagnetic energy

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.

Ascientific blank must be testable and capable of being proven false?

The smallest particle of an element that retains its identity in a chemical reaction. true or false