Discuss the important characteristics that could be revealed if you were to conduct a survey on the family of stars
What will be an ideal response?
A survey on the family of stars could reveal the following characteristics:a. Taking a survey is difficult because you must be sure to get an honest sample. If you don't survey enough stars, or if you miss some types of stars, your results can be biased.b. M dwarfs and white dwarfs are so faint they are difficult to find even near Earth and may be undercounted in surveys.c. Luminous stars, although they are rare, are easily visible even at great distances. Typical nearby stars have lower luminosity than our Sun.
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If Earth rotated once every 48 hours (instead of 24 hours), but everything else was the same, which of the following statements would be false?
A) There would still be summer and winter seasons. B) The length of the year would be longer. C) The Sun would appear to move across the sky at a slower rate. D) The length of a day would be longer.
A proton moving with a velocity of 4.0 × 104 m/s along the +y-axis enters a magnetic field of 0.20 T directed towards the -x-axis. What is the magnitude of the magnetic force exerted on the proton? (e = 1.60 × 10-19 C)
A) 8.0 × 10-15 N B) 3.9 × 10-15 N C) 2.6 × 10-15 N D) 0 N E) 1.3 × 10-15 N
An important feature of the mass spectrometer is that
A) all ions enter the device at equal speeds. B) ions of different masses bend differently. C) the greater an ion's mass, the wider its circular arc. D) a magnetic field exerts forces on moving charged particles. E) all of the above
The substances formed in a chemical reaction are called the ______________
Fill in the blank(s) with correct word