Machines produce less work than is used to run the machine
What will be an ideal response?
This is correct. Some work is transformed into thermal energy through the action
of the frictional forces. The work input must be the work output plus whatever frictional
work is done.
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What do we mean by the interstellar medium?
A) the gas and dust that lies in between the stars in the Milky Way galaxy B) the dust that fills the halo of the Milky Way galaxy C) the middle section of the Milky Way galaxy D) the name of an oracle who can channel messages from beings that live near the star called Vega
How do scientists determine how long ago Earth first formed?
A) radiometric dating of meteorites B) radiometric dating of Moon rocks C) radiometric dating of the oldest Earth rocks D) Models of planetary formation tell us how long it took Earth to grow to its present size.
Who proposed a model with the Sun (rather than Earth) at the center of the solar system, which was then tested by the other people listed below?
a. Copernicus b. Tycho c. Kepler d. Galileo
A carbon resistor has a resistance of 18 ? at a temperature of 20°C. What is its resistance at a temperature of 120°C? (The temperature coefficient of resistivity for carbon is -5.0 × 10-4 /C°.)
A) 18 ? B) 17 ? C) 16 ? D) 15 ? E) 14 ?