A positively charged insulating rod is brought close to an object that is suspended by a string. If the object is repelled away from the rod we can conclude:
A) the object is positively charged
B) the object is negatively charged
C) the object is an insulator
D) the object is a conductor
E) none of the above
A) the object is positively charged
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Scientists have confirmed that the particles of Saturn's rings are not ____
a. held by Saturn's moons b. within the Roche limit c. chunks of ice d. ancient e. primordial
Based on current understanding, what exactly is causing the expansion of the universe to accelerate?
A) WIMPs B) neutrinos C) white dwarf supernovae D) Gravity E) We don't know, but we call it "dark energy."
Explain Occam's Razor
What will be an ideal response?
The wavelengths of radiation from a star that is moving perpendicular to us
A) can be longer or shorter depending on the distance to the star B) are shorter than if the star were not moving C) are longer than if the star were not moving D) are the same as if the star were not moving