During its formation, Mars cooled quickly because it is a small planet
a. True
b. False
Indicate whether the statement is true or false
True
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A gas is placed in a container, which is immersed in an ice-water mixture as shown below
The first experiment, which systematically demonstrated the equivalence of mechanical energy and heat, was performed by
a. Joule. b. Boltzmann. c. Thompson, Count Rumford. d. Kelvin.
A solenoid of inductance L = 50 mH has a magnetic energy U = 3 x 10-4 J with a density u = 0.0042 J/ m3. What is the winding density n of the solenoid?
A) 58 turns/m B) 1584 turns/m C) 1200 turns/m D) 234 turns/m E) 746 turns/m
Why does "banking" (or tilting) a turning road create centripetal force?
a. Because banking the corner keeps cars from going too fast. b. Because the angle of the roadway creates a centrifugal force. c. Because the angle of the roadway creates a centripetal force. d. Because the angle of the roadway helps cars counteract friction. e. Because of friction.