Explain how objects can get charged by FRICTION
What will be an ideal response?
When two dissimilar materials are rubbed together, one literally rubs or tears electrons off the one type of molecule, leaving it positively charged, and the other material acquires the extra electrons, thereby becoming negative.
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Buoyancy: A cubical block of stone is lowered at a steady rate into the ocean by a crane, always keeping the top and bottom faces horizontal. Which one of the following graphs best describes the buoyant force B on this block as a function of time t if the block just enters the water at time t = 0 s?
A. 
B. 
C. 
D. 
E. 
There is a mass-luminosity relationship because stars support their weight by generating energy, and more massive stars have more weight to support
a. True b. False Indicate whether the statement is true or false
Based on the evidence that atmospheric carbon dioxide is a cause of planetary warming, what aspect of the graphs should most concern us?
A. The carbon dioxide concentration today is significantly higher than at any time in the past 800,000 years and is rapidly rising. B. Earth's past temperature rises and falls naturally. C. Earth's past carbon dioxide concentration rises and falls naturally.
Chromatic aberration occurs because of
A) polarization. B) spherical surfaces. C) dispersion. D) internal reflection. E) astigmatism.