Harmonics are created because:

What is the shape of the sector scan format display?

Which unit measures attenuation?

Discuss the operating principles of sonography, focusing on the pulse-echo technique and its significance in medical imaging. Explain how the echoes are used to create an image and the importance of echo strength and return time.

What frequency range qualifies sound as ultrasound?

What determines the brightness of a dot in the pulse-echo image?

A spring is attached to points A and B as shown in the figure.  The spring constant, k, is given equal to k = 100 N/m and it is stretched by s = 0.1m.  Distance b = 2 m. Consider the force which the spring exerts on point A only and calculate the moment it produces about the coordinate axes x and y.    Calculate the moment produced by the same force about axis OB. You need to show the expression using numerical values; however, you do not need to complete the calculations to find the value of the moment.

The shaft is supported by a journal bearing at A and a thrust bearing at B. Determine the tension in cable CE and the reactions at A and B when a load P = 93 lb and a couple moment M = 50 lb·in is applied. Assume the bearings are properly aligned. For full credit, you must show these steps: Draw a free body diagram. Write sum of forces acting on the body. Take the sum of moments about point B.

A truss is supported by a pin at point F and a roller at point J. Determine the force in members AB, FG, and DG and state whether the members are in tension or compression.  Show all your work and FBD(s) to receive full points.

Find the centroid, C, of the cross-section shown in the figure and the moment of inertia about the centroidal axis y’’. Show all your calculations to receive full credit. The figure is not in scale.