On the main sequence, stars obtain their energy
A) by converting helium to carbon, nitrogen, and oxygen.
B) from nuclear fission.
C) by converting hydrogen to helium.
D) from gravitational contraction.
E) from chemical reactions.
C
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Explain why Titan is of great interest to astronomers
What will be an ideal response?
How long ago did the Big Bang occur?
a. About 6,000 years ago. b. 15 thousand years ago. c. 15 million years ago. d. 15 billion years ago. e. 15 trillion years ago.
You can exert more force on the pedals of a bicycle if you pull up on the handlebars because
1) your center of gravity can be shifted to a position directly above the pedals, 2) the handlebars, in turn, pull down on you and this force is transmitted to the pedals, 3) rotational inertia is lessened, 4) rotational inertia is increased, all of which illustrates 5) that equilibrium is center-of-gravity dependent. 6) the law of action and reaction. 7) inertia may be both linear and rotational.
An “up” quark has a charge of -2/3 times the electron’s charge. A “strange” quark has a charge of +1/3 times the electron’s charge. What is the net charge of the quark triplet consisting of two up quarks and a strange quark? (This quark triplet is one of a family of three “? particles.”)
A. +(5/3)e B. +e C. +(1/3)e D. zero E. -(1/3)e F. -e T. -(5/3)e