Which pulls on the oceans of Earth with a greater force?
A) Moon
B) Sun
C) both pull the same.
Answer: B
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Explain why stars displaying spectral lines of molecules must be relatively cool
What will be an ideal response?
An atom that has more protons than electrons is a ______________ ion
a. neutral b. positive c. negative d. polyatomic
A negatively-charged rod is brought close to (but does not touch) two neutral spheres that are in contact with each other but insulated from the ground. If the two spheres are then separated, what kind of charge will be on the spheres?
A) The sphere near the charged rod becomes negative and the other one becomes positive. B) Both spheres become negative. C) The sphere near the charged rod becomes positive and the other one becomes negative. D) The spheres do not get any charge. E) Both spheres become positive.
Which of the following statements about the main sequence stage in the life of a star is FALSE?
a) main sequence stars are rare in the Galaxy, so we are lucky to be living around one b) different stars spend a different amounts of time (number of years) in the main sequence stage, depending on the characteristics they were born with c) during the main sequence stage, the mass of any star does not change significantly d) during the main sequence stage, energy to power the star is provided by the fusion of hydrogen e) all stars spend the majority of their lives in the main sequence stage