The product of gas pressure and volume for a given mass of gas is constant
A) if the temperature doesn't change.
B) whether or not the temperature changes.
C) never.
D) none of the above
Answer: A
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A spring is stretched 10 cm by a suspended 1-kg block. If two such springs side-by-side are used to suspend the 1-kg block, each spring will then stretch
A) 5 cm. B) 10 cm. C) 20 cm. D) 30 cm. E) none of the above
Write the energy balance for an ice pond at noon on a sunny day with solar energy of 300 W/m2 to the ice, air at -8ºC, convective heat transfer coefficient of 10 W/m^2?K above the ice, and 1ºC water with a convective heat transfer coefficient of 30 W/m^2?K below the ice. Then estimate the rate at which the ice thickness is increasing or decreasing.
What will be an ideal response?
What do we mean by a mass extinction?
A) the extinction of a large fraction of the world's plant and animal species in a relatively short period of time B) the extinction of large animals, such as dinosaurs C) an extinction caused by the impact of an asteroid or comet D) the extinction of any species of plant or animal that has mass
Which ray passing through a thin lens does not change direction?
A. The ray going through the center of the lens. B. The ray parallel to the optical axis. C. Any ray coming from the focal point. D. All outgoing rays are deflected relative to the incoming rays.