Ultrasound of intensity 1. 50\times 10^2~\mathrm{w/m^2}1. 50×10 2 w/m 2 is produced by the rectangular head of a medical imaging device measuring 3. 00 by 5. 00 cm. What is its power output?.

Which would not reduce the amount of green house gasses in the air

Air is to be preheated by hot exhaust gases in a cross-flow heat exchanger before it enters the furnace. air enters the heat exchanger at 95 kpa and 20°c at a rate of 0.6 m^3/s. the combustion gases (cp = 1.10 kj/kg°c) enter at 160°c at a rate of 0.95 kg/s and leave at 95°c. determine the rate of heat transfer to the air and its outlet temperature.

A0.580-kg rock is tied to the end of a string and is swung in a circle with a radius of 0.500 meters. the velocity of the rock is 4.50 m/s. what is the centripetal force acting on the rock? 15.5 n 5.22 n 69.8 n 23.5 n