A gravitational assist, or slingshot, can be used to either speed up or slow down a spacecraft
Indicate whether the statement is true or false
TRUE
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A substance consisting of which molecule shown below should have a higher boiling point?
A) The molecule on the left, COImage, because it has a fewer number of atoms. B) The molecule on the right, ImageImageCl, because it has a greater number of atoms. C) The molecule on the left, COImage, because it is less symmetrical. D) The molecule on the right, ImageImageCl, because of electronegativity considerations.
If a heat engine has an efficiency of 30% and its power output is 600 W, what is the rate of heat input from the combustion phase?
a. 1800 W c. 2000 W b. 2400 W d. 3000 W
Estimate the following:
(a) The change in your gravitational potential energy on taking an elevator from the ground floor to the top of the Empire State Building. The building is 102 stories high (assuming a 3 min ride to the top of the building). (Assuming your mass is 68 kg and the height of one story to be 3.5 m.) (b) The average force exerted by the elevator on you during the trip. (c) The average power delivered by that force.
Why are optical fibers important for communication?
a. They can carry thousands of times the information that wires can. b. Light goes faster than electricity. c. They carry digital information. Wires can't carry digital information. d. all of the above