Springs: An ideal spring with a spring constant (force constant) of 22 N/m is stretched from equilibrium to 2.9 m. How much work is done in the process?
A. 93 J
B. 186 J
C. 47 J
D. 121 J
Answer: A
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Suppose you lived at Earth's equator. Which of the following statements would not be true?
A) The north celestial pole is directly on your horizon, due north (with Polaris quite nearby). B) The south celestial pole is directly on your horizon, due south. C) Every day of the year, the Sun is above your horizon for 12 hours and below it for 12 hours. D) The celestial equator goes through your sky from due east on your horizon, through 50° altitude in the south, to due west on the horizon. E) No stars are circumpolar.
How many grams of ice at -13°C must be added to 711 grams of water that is initially at a temperature of to produce water at a final temperature of
Assume that no heat is lost to the surroundings and that the container has negligible mass. The specific heat of liquid water is 4190 J/kg ? °C and of ice is 2050 J/kg · °C. For water the normal melting point is 0.00°C and the heat of fusion is 334 × 103 J/kg. The normal boiling point is 100°C and the heat of vaporization is 2.26 × 106 J/kg. What will be an ideal response?
The Big Bang formed:
A) only hydrogen. B) only helium. C) hydrogen and helium, but nothing else. D) all elements up to iron. E) all elements found in nature now.
Considering only the role of dark energy and keeping all other factors the same, which hypothetical universe is oldest?
A) the one with more dark energy B) the one with less dark energy C) Dark energy doesn't affect the inferred age of the universe.