You leave your 75 w portable color tv on for 6 hours each day and you do not pay attention to the cost of electricity. if the dorm (or your parents) charged you for your electricity use and the cost was $0.3 /kw · h, what would be your monthly (30 day) bill? answer in units of dollars.

What color would an object that reflects green and blue light appear to be in white light? a. blue b. cyan c. magenta d. black

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.

During takeoff, the sound intensity level of a jet engine is 170db at a distance of 34 m. what's the sound intensity level at a distance of 1.0 km?