In an engine operating in the Otto cycle, the final volume of the fuel-air mixture is one sixth the initial volume. Assume ? = 1.4 . The maximum theoretical efficiency of this cycle is
a. 17%.
b. 49%.
c. 51%.
d. 56%.
e. 83%.
c
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A projectile is fired from point 0 at the edge of a cliff, with initial velocity components of v0x = 60.0 m/s and v0y = 175 m/s, as shown in the figure
The projectile rises and then falls into the sea at point P. The time of flight of the projectile is 40.0 s, and it experiences no appreciable air resistance in flight. What is the height of the cliff? What will be an ideal response?
An extremely large collection of stars bound together by gravitational attraction and occupying a huge volume of space is called a _______________
a. planetary nebula b. solar system c. universe d. galaxy
Which of the following is the best object to use as a point of reference for describing the location of the parked car?
A. the bird B. the streetlight C. the store D. the tree
The Laser Interferometer Gravitational-Wave Observatory (LIGO) made the first detection of gravitational waves in 2016. Which of the following best describes the discovery?
A) The detection verified that gravitational waves exist as predicted by the general theory of relativity. B) The detection of gravitational waves was a huge surprise because no one had predicted they would exist prior to their discovery. C) There is still considerable doubt whether LIGO really detected gravitational waves. D) The detection of gravitational waves contradicted predictions made by the general theory of relativity, requiring scientists to revise the theory.