What is the approximate surface temperature of an F star?
A) 12,000 K B) 6,000 K C) 7,000 K D) 5,000 K
C
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Latent Heats: When a sample of water at 0.0°C is cooled to -36.0°C and freezes in the process, 935,000 kJ of heat is liberated. What is the mass of this sample of water? For water LF = 334,000 J/kg, LV = 2.256 × 106 J/kg, and the specific heat of ice is 2050 J/kg ? C°.
A. 2290 kg B. 1145 kg C. 2800 kg D. 12,700 kg
Explain why aluminum cans won out in the beverage wars even though steel cans cost less energy per use to make
What will be an ideal response?
Aberration: Chromatic aberration in lenses is due to the
A. reflection of light by the lens. B. refraction of light by the lens. C. dispersion of light by the lens. D. polarization of light by the lens. E. None of the other choices is correct.
Which of the following correctly lists two key pieces of evidence that, together, indicate that we should expect human activity to cause global warming?
A) (1) Carbon dioxide tends to make planets warmer than they would be otherwise. (2) Measurements demonstrate that human activity is raising the carbon dioxide concentration in the atmosphere. B) (1) The carbon dioxide cycle regulates Earth's climate. (2) Human activity has disrupted the carbon dioxide cycle. C) (1) The burning of fossil fuels is a form of human activity. (2) Human activity is always bad for the environment. D) (1) We can learn about past climate from ice cores. (2) Ice cores show that Earth naturally has cooler and warmer periods.