A17.5 kg block is dragged over a rough, horizontal surface by a constant force of 167 n acting at an angle of 30◦ above the horizontal. the block is displaced 23.9 m, and the coefficient of kinetic friction is 0.136. the acceleration of gravity is 9.8 m/s 2 . 17.5 kg µ = 0.136 167 n 30 ◦ if the block was originally at rest, determine its final speed. answer in units of m/s.

Trumpeter a holds a b-flat note on the trumpet for a long time. person c is running towards the trumpeter at a constant velocity. person b is running away from the trumpeter at the same rate. person d is standing still the whole time. which person hears a frequency that is lower than the b-flat?

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 law of conservation of energy states that energy cannot be created or , energy can be from one substance to another. the first blank is ' destroyed ' and for the second blank is ' transferred '