One day while measuring acceleration with his pulse as a timing source, Galileo became so excited that his pulse rate increased. His results for acceleration that day were probably
A. unchanged.
B. higher than usual.
C. lower than usual.
D. more accurate than usual.
Answer: B
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Why are distant stars redder than nearby stars of the same spectral type?
What will be an ideal response?
Earth has been gradually warming in recent decades, and very strong evidence indicates that the cause of this warming is
A) human activities that are increasing the concentration of greenhouse gases in Earth's atmosphere. B) the increase in forest fires during recent years. C) a gradual brightening of the Sun. D) the fact that our politicians spout a lot of hot air.
The choices below each describe the appearance of an H-R diagram for a different star cluster. Which cluster is most likely to be located in the halo of our galaxy?
A) The diagram shows main-sequence stars of every spectral type except O, along with a few giants and supergiants. B) The diagram shows main-sequence stars of spectral types G, K, and M, along with numerous giants and white dwarfs. C) The diagram shows main-sequence stars of all the spectral types except O and B, along with a few giants and supergiants. D) The diagram shows no main-sequence stars at all, but it has numerous supergiants and white dwarfs.
A river has a steady speed of 0.30 m/s. A student swims downstream a distance of 1.2 km and returns to the starting point. If the student swims with respect to the water at a constant speed and the downstream portion of the swim requires 20 minutes, how much time is required for the entire swim?
a. 50 minutes b. 80 minutes c. 90 minutes d. 70 minutes e. 60 minutes