Cart A, of mass m, starts from rest and travels in a straight line with acceleration a. It reaches velocity v in time t. Cart B, of mass 4m, starts from rest and travels in a straight line with acceleration 
. At time t it has reached velocity
A.
.B.
.C.
D.
E.
Answer: B
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A(n) ____________________ is a cool, dense cloud of dust and gas that is undergoing gravitational contraction
Fill in the blank(s) with correct word
What evidence did astronomers use to prove jets travel in opposite directions?
a. spectral lines from fast-moving red- and blue-shifted ionized gas b. gamma ray emission spectra c. magnetic tubes in accretion disks d. mass transfer from a binary star to a compact companion e. pulsar rotation periods
Groombridge 34 is an M2 main sequence star. Based on this information, which statement is true? a. Groombridge 34 has a surface temperature that is more than the Sun
b. Groombridge 34 has mass that is greater than the Sun. c. Groombridge 34 is less luminous than the Sun. d. Groombridge 34 is more luminous than the Sun. e. Groombridge 34 is located near the upper left hand corner on the HR diagram.
What did Galileo discover through his telescope when he looked at Jupiter, and how did it refute the Ptolemaic model?
What will be an ideal response?