Simple Harmonic Motion: The position of an object that is oscillating on an ideal spring is given by x = (17.4 cm) cos[(5.46 s-1)t]. Write an expression for the velocity of the particle as a function of time using the sine function.
What will be an ideal response?
v = - (95.0 cm/s) sin[(5.46 s-1)t]
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It is a well-known fact that water has a higher specific heat than iron. Now, consider equal masses of water and iron that are initially in thermal equilibrium. The same amount of heat, 30 calories, is added to each one. Which statement is true?
A) They remain in thermal equilibrium. B) They are no longer in thermal equilibrium; the iron is warmer. C) They are no longer in thermal equilibrium; the water is warmer. D) It is impossible to say without knowing the exact mass involved. E) It is impossible to say without knowing the exact specific heats.
An expansion process on an ideal diatomic gas has a linear path between the initial and final states on a pV diagram. The initial pressure is 300 kPa, the initial volume is 0.020 m3, and the initial temperature is 390 K
The final pressure is 160kPa and the final temperature is 310 K. The change in the internal (thermal) energy of the gas is closest to A) -3100 J. B) -1800 J. C) 3100 J. D) 1800 J. E) 0.00 J.
A line representing a wave front for a wave should be drawn:
a. from the source to the receiver. b. from one crest to the preceding crest. c. in the direction the wave is moving. d. along one of the crests of the wave.
A jet has an angular length of 10 seconds of arc and flows from a star at a distance of 2,000 pc. How far does this jet extend away from the star?
a. 20,000 pc b. 20,000 AU c. 20, 000 ly d. 20,000 miles e. 20,000 km