Why do scientists suspect that most of our galaxy's mass consists of dark matter? Drag the terms on the left to the appropriate blanks on the right to complete the sentences.
Answer:
Dark matter is invisible to our telescope, because it does not emit light. But we can detect it because of its gravity that affects observable objects.
Starts orbit the galactic center significantly faster than they should if we could see most of our galaxy's mass. Large amount of unseen mass is present in our galaxy, mostly residing in the halo of the galaxy.
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The center of the universe:
A) is the Milky Way. B) is the Sun. C) is Earth. D) is where the Big Bang happened. E) does not exist anywhere in space.
Four equal charges are located at the corners of a square of side d. If the magnitude of each charge is doubled, then what happens to the resultant force on each charge?
A) It is doubled. B) It is quadrupled. C) It increases by a factor of 8. D) It remains the same. E) None of the other choices is correct.
A person's prescription for bifocals is –0.35 diopter for distant vision and +3.10 diopters for near vision, the near vision being accomplished by inserts into the distant vision lens. What is the net power of the near vision correction?
a. 2.75 diopters b. 3.10 diopters c. 3.45 diopters d. 1.085 diopters e. More information is needed.
The focal length of the lens of a simple camera is 40.0 mm. How far must the lens be moved to change the focus of the camera from a person 25 m away to one that is 4.0 m away?
A) 0.2 mm B) 0.3 mm C) 0.4 mm D) 0.5 mm E) 0.7 mm