Hydrocarbons release a lot of energy when ignited. Where does this energy ultimately come from?
A) the breaking of chemical bonds
B) the formation of chemical bonds
C) photosynthesis
D) nuclear fusion in the sun
Answer: D
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Work-Energy Theorem: The kinetic friction force that a horizontal surface exerts on a 60.0-kg object is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide before coming to a stop?
A. 15.0 m B. 30.0 m C. 375 m D. 750 m
Wien's Law: If the surface of our bodies is at 37°C, at what wavelength does the radiation that we emit peak if we behave like a blackbody? The constant in Wien's law is 0.0029 m ? K.
Fill in the blank(s) with the appropriate word(s).
In what sense are the quasars "quasi-stellar"?
A) Their energy production is hydrogen-helium fusion, like main sequence stars. B) They are upscale versions of O stars, yet hundreds of times more massive. C) Their luminosity comes from the millions of supergiants that compose them. D) Their spectra is like that of ordinary stars. E) In short time exposures, their images looked stellar.
Two 100 W lightbulbs are to be connected to a 120 V source. What is the current, potential difference, and dissipated power for each when they are connected:
(a) in parallel (the normal arrangement)? (b) in series?