Young david, who slew goliath, experimented with slings before tackling the giant. he found that with a sling of length 0.796 m, he could revolve the sling at the rate of 10.2 rev/s. if he increased the length to 1.14 m, he could revolve the sling only 7.3 rev/s. a) what is the larger of the two linear speeds? answer in units of m/s.

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.

The percent efficiency of a machine can never be 100% (or greater), because in the real world some energy is always converted into a. heat b. work c. input force d. output force

Which type of energy would have nothing to do with ironing clothes? a. heat b. chemical c. electrical d. mechanical