Jet planes operate by
A) rocket drive [i.e., ejecting heated rocket fuel rapidly out the back end of the engine].
B) ejecting ions out the back end of the engine.
C) sucking in air, heating it , and allowing it to expand out the back end of the engine.
D) sucking in air and blowing it rapidly out the back of the engine by means of propeller blades inside the engine.
E) magic.
C
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An example of conservation of angular momentum is
A. A car going around a corner B. An ice skater changing the speed of a spin C. Jumping off a diving board D. A golf club hitting a golf ball
Radio telescopes image a universe much ________ in temperature than with visible light
Fill in the blank(s) with correct word
In an isochoric process where the pressure increases from to , does the internal energy of the system increase or decrease and does the temperature increase or decrease?
a. The internal energy increases and the temperature decreases. b. The internal energy increases and the temperature increases. c. The internal energy decreases and the temperature decreases. d. The internal energy decreases and the temperature increases.
An object is attached to a spring, and its frequency of oscillation is measured. Then another object is connected to the first object, and the resulting mass is nine times the original value. By what factor is the frequency of oscillation changed?
a. 9 c. 1/3 b. 3 d. 1/9