The blood flow rate in the aorta is 0.28m/s. An ultrasonic wave with frequency 4.2MHz moves along the flow and the waves are reflected from the red blood cells. What is the beat frequency assuming the speed of the waves is 1500m/s

Answer asap! the weather patterns on earth are shown in this image. explain why there are convection currents; why there are hotter and colder parts of earth.

Prompta snowboarder stands at the top of a hill and decides to see if he can increase his speed on his next trip down the slope. describe one thing the snowboarder could do to incrlase his speed on the slope. explain why this would cause his speed toincrease relate one of newton's laws to this problem.

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?