One of the main reasons the Hubble Space Telescope was built and launched was to measure how fast the universe is expanding. If the expansion turns out to be faster than we thought, our estimate for the age of the universe will be
A) older (more time between now and the Big Bang).
B) younger (less time between now and the Big Bang).
C) unaffected.
B
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A charge of 2.0 ?C flows onto the plates of a capacitor when it is connected to a 12. V battery. How much work was done in charging this capacitor?
A) 24. ?J B) 12. ?J C) 48. ?J D) 0.14 mJ E) 21. ?J
For water at 2°C,
A) Cp = Cv. B) Cp > Cv. C) Cp < Cv. D) More information is needed to answer this question.
The coefficient of linear expansion of aluminum is 24 × 10-6 K-1 and the coefficient of volume expansion of olive oil is 0.68 × 10-3 K-1
A novice cook, in preparation of some pesto, fills a 1.00-L aluminum pot to the brim and heats the oil and the pot from an initial temperature of 15°C to 190°C. To his consternation some olive oil spills over the top. How much? A) 0.11 L B) 0.12 L C) 0.13 L D) 0.14 L E) 0.15 L
A 120-V rms voltage at 60 Hz is applied across an RC circuit. The rms value of the current in the circuit is 0.60 A, and it leads the voltage by 60°. What is the resistance in this circuit?
A) 100 ? B) 60 ? C) 150 ? D) 200 ? E) 120 ?