During each cycle of operation, the thermal energy input to a heat engine is 400 J and the exhaust is 300 J. This engine's efficiency is
A) 50%. B) 0%. C) 75%. D) 25%. E) 100%.
D
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How often does Venus rotate on its axis?
a. 24 h b. 182 Earth days c. 243 Earth days d. 1 Earth year e. 3 Earth years
When writing in the inverted pyramid style, the first paragraph should include the "who, what, when, where, and why" of the topic.
Answer the following statement true (T) or false (F)
A box is pushed across a rough horizontal floor by a force acting parallel to the floor in the direction of motion. A force providing no impulse during the motion is
A. friction. B. the applied force. C. gravity. D. None of these choices are correct
The celestial equator is
a. a line around the sky directly above Earth's equator. b. the dividing line between the north and south celestial hemispheres. c. the path that the Sun appears to follow on the celestial sphere as Earth orbits the Sun. d. a line around the sky directly above the Earth's equator and the dividing line between the north and south celestial hemispheres. e. a line around the sky directly above Earth's equator and the dividing line between the north and south celestial hemispheres.