Felicity is on a field trip to the local zoo. She notices an old watchtower.
The sun is directly behind this watchtower, drawing the attention towards the borders and outlying features of the watchtower.
What effect is Felicity observing?

What precautions should you take to prevent injuries when dealing with heavy loads?

Thermal stresses are developed in a metal when its a) initial temperature is changed b) final temperature is changed c) density is changed d) thermal deformation is prevented e) expansion is prevented f) contraction is prevented

An air compression refrigeration system is to have an air pressure of 100 psia in the brine tank and an allowable air temperature increase of 60°f for standard vapor compression cycle temperatures of 77 f entering the expansion cylinder and 14 f entering the compression cylinder, calculate the coefficient of performance a. 2.5 b 3.3 c. 4.0 d. 5.0