Awheel of radius 50 cm has a moment of inertia of 20 kg-m2. a constant force of 100 n is applied at the rim. (a) assuming it starts from rest, how much work is done in 8 s? (b) what power is developed?

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.