A force of 7.2 N acting on a 1.0-kg object initially at rest moves it through a parallel distance of 2.5 m. Neglecting friction, what is the speed of the object when it is moved 2.5 m?
6.0 m/s
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The planet COROT-14b is only slightly larger than Jupiter, but is several times more massive. Which is the most plausible explanation for its similar size to Jupiter?
A) Planets that are close to a star are heated up and therefore larger. B) The mass measurement is mistaken, and it is actually about 10 times more massive than Jupiter. C) It is made of elements other than hydrogen and helium which do not compress under their own gravity. D) The hydrogen and helium gas compressed even under their own gravity to a higher density than Jupiter.
A new generation of ground-based telescopes is currently being built that overcomes the limitations of the older large telescopes. Some of these new telescopes
a. use segmented mirrors. b. use mirrors that are very thin. c. use active optics to control the shape of the mirror. d. all of the above. e. none of the above
Some parts of the Sun rotate faster than other parts
Indicate whether the statement is true or false
Which of the following is NOT true about the RGB color system?
A. The system combines the red, green, and blue light channels. B. The intensity level of each light channel is measured in values. C. The values range from 0 to 360. D. To ensure exact color specifications, use different values from the channels.