The reason Earth's moon does not fall into Earth is because it orbits beyond Earth's gravitational pull.
Answer the following statement true (T) or false (F)
False
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The term "cosmic distance ladder" refers to the fact(s) that:
Select the ones that apply: a. change in apparent position of object on sky through Earths orbit, which gives a measure of distance. (p=1/D) b. Spectral classification of star, which gives luminosity.D*=Sq rt L/4pieB c. variable stars whose luminosity is related to their period.D*=Sq rt L/4pieB d. relation between a galaxy's rotation rate and luminosity. D*=Sq Rt Lg/4pieBg e. Exploding star whose luminosity can be determined by its light curve. Dg=SqRt Lsn/4pieBsn f. Relation between galaxies recession velocity and distance.D=V/H g. All of the above facts.
Dark energy is speeding up the expansion of the Universe.
Answer the following statement true (T) or false (F)
What is the hole in the ozone layer thought to be caused by?
A) greenhouse gases B) carbon dioxide C) water vapor D) CFCs E) acid rain
A solid cylinder (I = MR2/2) has a string wrapped around it many times. When I release the cylinder, holding on to the string, the cylinder falls and spins as the string unwinds. What is the downward acceleration of the cylinder as it falls?
a. 0 c. 6.5 m/s2 b. 4.9 m/s2 d. 9.8 m/s2