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

What is the length x of the side of the triangle below? (hint: use the cosine function)

What are similarities and differences between refraction, reflection, diffraction and absorption?

Determine the change in width a, height b, thickness t when a plate is subjected to the uniform distributed load and is made of material having modulus of elasticity e=230 gpa and poisson's ratio ν=1/3. given : a=400 mm and b= 300 mm also the uniformly distributed load in downward y direction of plate is 2 mn/m and in the positive x direction is 3 mn/m and t=20 mm