Isaac Newton first became famous for his contributions to the understanding of
A) the laws of mechanics.
B) the law of gravity.
C) light.
Answer: C
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A particle moves along the x axis. its position as a function of time is given by x = 6.8 t + 8.5 t^2 , where t is in seconds and x is in meters. what is the acceleration as a function of time?
What will be an ideal response?
When we see a meteor shower, it means that
A) Earth is crossing the orbit of a comet. B) the solar wind is unusually strong. C) an Earth-approaching asteroid has recently come close to our planet. D) you should duck and run for cover to avoid being blasted on the head by a rock from space.
Which of the following best sums up current scientific thinking about the nature of dark matter?
A) Most dark matter probably consists of weakly interacting particles of a type that we have not yet identified. B) Dark matter consists 90% of neutrinos and 10% of WIMPs. C) There is no longer any doubt that dark matter is made mostly of WIMPs. D) Dark matter probably does not really exist, and rather indicates a fundamental problem in our understanding of gravity.
A helium-filled balloon has a volume of 1 m3 . As it rises in the earth's atmosphere, its volume expands. What will its new volume be (in m3) if its original temperature and pressure are 20°C and 1 atm, and its final temperature and pressure are -40°C and 0.1 atm?
a. 4 b. 6 c. 8 d. 10 e. 1.5