The leaves of a positively charged electroscope diverge more when an object is brought near the knob of the electroscope. The object must be:
A) a conductor
B) an insulator
C) positively charged
D) negatively charged
E) uncharged
C) positively charged
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Which of the following statements is an inference from a model (rather than an observation)?
A) The Sun emits neutrinos. B) The photosphere emits visible light. C) The photosphere is made out of mainly hydrogen and helium. D) The corona is hotter than the photosphere. E) The Sun's core is gradually turning hydrogen into helium.
Why is the temperature at the region of a sunspot cooler than the photosphere?
a. They are holes in the photosphere that reveal the lower temperature gases in the deeper layers. b. They represent points where streams of cool gas from the corona lower the temperature in those regions of the photosphere c. Powerful magnetic fields in the sunspots act upon the atoms of the photosphere to prevent them from emitting light. d. Powerful magnetic fields inhibit the convective flow of the gases of the photosphere downward allowing them to cool for longer than would normally be permitted.
The neap tides occur at the new moon and full moon
a. True b. False Indicate whether the statement is true or false
The velocity at the midway point of a ball able to reach a height y when thrown with velocity vi at the origin is:
A.
B.
C.
D.
E.