The gas tank has an inner radius of 24 in. and a thickness of 0.5 in. if it supports the 1500‐lb load at its top, and the gas pressure within it is 2 푙푏/푖푛ଶ, determine the state of stress at point a.

In a stagnant pool of water, a crayfish may spend much of its time lying with one side of its carapace near the surface of the water. in this position, it will move the walking legs on that side in a rhythmic back-and-forth motion. explain the likely function of this behavior.

Waves are used in many practical applications to support work, entertainment, and health. one example is the use of ultrasound imaging to safely track the development of a growing fetus. what is a specific example of a practical application of waves in medicine, entertainment, safety, or other fields? provide a brief explanation of how the properties of waves are useful to that application.

What is friction? how does it affect the motion of an object?