The chart shows data for four heat engines. Heat Engine
w
X
Y
Z
Th (K)
620
840
900
500
T. (K)
120
100
300
25
Which lists the engines from most efficient to least efficient?
OY, X, W, Z
O Z, W, X, Y
O Z, X, W, Y
OY, W, X, Z

How is the gravitational force related to the distance between two objects?

Nacidified solution was electrolyzed using copper electrodes. a constant current of 1.18 a caused the anode to lose 0.584 g after 1.52 ✕ 103 s. given that the charge of an electron is 1.6022 ✕ 10−19 c, calculate avogadro's number. assume that copper is oxidized to cu2+ ions.

How to tell if two objects are in thermal equilibrium 1.the objects have the same temperature 2.the objects are the same size 3.the objects are touching each other 4.the objects temperatures are changing