Two stars, Tom and Jerry, have the same spectral type. Tom is luminosity class V and Jerry is luminosity class I. Which star is bigger? Which star is more luminous? Which star has a hotter surface temperature? Explain your answers
What will be an ideal response?
Tom is on the main sequence, while Jerry is a supergiant. They both have the same surface temperature since they have the same spectral type, but since Jerry is much more luminous, Jerry must be much bigger in size.
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The grooved terrain found on Ganymede is believed to be:
A) systems of faults in the brittle crust. B) flow channels or liquid methane. C) caused by meteor impacts. D) formed with long cracks in its icy crust.
Which of the following is a negatively charged polyatomic ion?
a. Ammonium ion b. Oxide ion c. Sodium ion d. Nitrate ion
What do we mean by time dilation in relativity?
A) It is the idea that time really runs slower in reference frames moving relative to you. B) It is the idea that time seems to run slower in reference frames moving relative to you, but time really is the same for everyone. C) It is the idea that relativity makes time dilate, or expand, for people who study it. D) It is a hallucinogenic effect experienced by people who take too much of something.
A car can go from 0 - 60 mph in 12 S. A second car is capable of twice the acceleration of the first car. Assuming that it could maintain the same acceleration at higher speeds, how much time will this second car take to go from 0-120 MPH?
A. 12 S B. 9.0 S C. 6.0 S D. 3.0 S