Electromagnetic waves in a vacuum travel with the speed of light
Indicate whether the statement is true or false
TRUE
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Stars are born in
a. reflection nebulae. b. dense molecular clouds. c. HII regions. d. the intercloud medium. e. the local bubble.
Blue stars are always more luminous than red stars
Indicate whether the statement is true or false
The fluid to which Bernoulli's equation is applied is based on what being conserved for the fluid?
a. its momentum b. its potential energy c. its kinetic energy d. its total mechanical energy
A real (non-Carnot) heat engine, operating between heat reservoirs at temperatures of 450 K and 270 K, performs 3.3 kJ of net work, and rejects 8.2 kJ of heat in a single cycle
(a) What is the thermal efficiency of this heat engine? (b) What is the maximum efficiency it could possibly have?