Physics Questions and Answers January 20, 2020

Device 1, shown at right, represents a heat engine operating between reservoirs at 900 K and 400 K. (The system interacting with the reservoirs is represented by the dashed region.) The numbers and arrows indicate either thermal energy transfers or work done during each cycle. 900 K 800 J 400 J 1. How much work is done on the system during each

Two identical thin sticks are suspended from a pivot at P. One is held horizontal and released. If they stick together when they collide, how high do they swing?

Two solid cylindrical rods AB and BC are welded together at B and loaded as shown. Knowing that P=10 kips, find the average normal stress at the midsection of rod AB, rod BC.

30 in 25 in A B P 1.25 in 12 kips 0.75 in

How does local topography contribute to the temperature inversion?

How does temperature inversion contribute to the formation of valley fog?

The figure on the right is a snapshot of two plane sound waves passing through a region of space. For each wave the first and last straight lines represent wavefront peaks, and the middle line is a wavefront trough. Each wave has amplitude A. Wave 1 C B (a) At each lettered point A, B, C what are the displacements of each wave and the net