The position of a mass that is oscillating on a spring is given by x = (17.4 cm) cos[(5.46 s-1 )t]. Write an expression for the acceleration of the particle as a function of time
What will be an ideal response?
-(519 cm/s2 ) cos[(5.46 s-1 )t]
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A watt is equal to
a. 746 horsepower. b. one calorie. c. one joule. d. 1 J/s. e. a unit of energy.
Which type of generating plant would you expect to be more energy efficient, steam-electric or hydroelectric?
A) Hydroelectric, because the lake and river water provides natural cooling for the exhaust. B) Steam-electric, because there is so much more energy per ton in fossil fuels than in water behind a dam. C) Hydroelectric, because it is not a heat engine and so is not restricted by the second law of thermodynamics. D) Hydroelectric, because there is so much energy in a large lake raised up behind a dam. E) Steam-electric, because it can have a very high operating temperature due to having a large and thick boiler.
Earthquakes generate ________ that scientists can use to deduce the internal structure of Earth.
A. weather patterns B. magnetic fields C. electromagnetic waves D. seismic waves E. lava flows
Which angle is the angle of incidence for the light ray shown approaching the plane mirror?
 a. 60° b. 30° c. neither d. either