If you were blindfolded and heard a siren going off and could tell that the pitch was dropping, which way could you safely assume that the siren was moving?
pick all that apply.

a: it's moving towards you

b: it isn't moving at all

c: it's moving away from you

What is the fate of the electrons that interact with a specimen in an electron microscope?

If a rock is thrown upward on the planet mars with a velocity of 12 m/s, its height (in meters) after t seconds is given by h = 12t − 1.86t2. (a) find the velocity of the rock after two seconds. m/s (b) find the velocity of the rock when t = a. 12−3.72a m/s (c) when will the rock hit the surface? (round your answer to one decimal place.) t = s (d) with what velocity will the rock hit the surface? m/s

The star nearest to our sun is proxima centauri, at a distance of 4.3 light-years from the sun. how far away, in km, is proxima centauri from the sun?