If, from the point of view of Earth-bound observers, the Moon is in new Moon phase on a particular day, what phase is Earth as seen from the Moon?
What will be an ideal response?
full Earth
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The greenhouse effect occurs because carbon dioxide is opaque to infrared radiation
a. True b. False Indicate whether the statement is true or false
A light beam with wavelength 440. nm in a material then enters air and its wavelength becomes 577. nm
(a) What is the index of refraction for the material? (b) At what angle with the surface will the beam be totally reflected back in the material?
Answer the following statement(s) true (T) or false (F)
1. In figure R2.12, the object whose world line is labelled B is moving along the x axis. 2. Coordinate time would be frame-independent if the Newtonian concept of time were valid. Consider a Home Frame and an Other Frame that moves in the +x direction with respect to the Home Frame. 3. Observers in the Home Frame will conclude that the clocks in an Other Frame will be out of synchronization, even if the observers in the Other Frame have carefully synchronized clocks using the Einstein prescription.
If a galaxy's overall mass-to-light ratio is 100 solar masses per solar luminosity, and its stars account for only 5 solar masses per solar luminosity, how much of the galaxy's mass must be dark matter?
A) 100 percent B) 95 percent C) 80 percent D) 50 percent E) 5 percent