Which of the following best describes the situation according to Jackie?
A) She stays still, while Earth rushes away from her at 0.9999c and Vega rushes toward her at 0.9999c. Since Vega is 25 light-years away, she says it takes Vega about 25 years to reach her.
B) She stays still, while Earth rushes away from her at 0.9999c and Vega rushes toward her at 0.9999c. She sees the distance from Earth to Vega shortened considerably from 25 light-years, and therefore it takes far less than 25 years for Vega to reach her.
C) She says that the 25-light-year trip takes only a few months and therefore concludes that she is traveling faster than the speed of light.
D) She's taking a trip that takes 25 years from Earth to Vega.
B
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How might Mars's weakened magnetic field have allowed for major changes in its climate?
A) Atmospheric gases were left vulnerable to being stripped into space by solar wind particles. B) The heat combined with the magnetic field, and disappeared with it. C) Mars has actually heated up since the magnetic field weakened, since the solar rays no longer have such a dense layer to get through. D) They are completely unrelated; there is no possible influence.
This x-ray image was taken by the Chandra X-ray Observatory. Without knowing anything more about the object that is shown, what can you conclude from looking at this image?
A) Some parts of the object emit more x-rays than others. B) The x-rays from this object come in a variety of different colors. C) This object emits much more light in the form of x-rays than in the form of visible light. D) Yellow regions emit the highest-energy x-rays and red regions emit the lowest-energy x-rays.
A blend of colors in sunlight’s spectrum
A. Prism or A Diffraction Grating |
B. Annie Jump Cannon |
C. Temperature |
D. Spectroheliometer |
E. Continuous Spectrum |
F. Joseph Van Fraunhofer |
A car and a truck are traveling in the same direction along a straight section of highway. The car is moving at 55. mph and the truck is moving 45. mph. What is the velocity of the truck relative to the car?
What will be an ideal response?