A(n) ____ contains two or more atoms that are bound together by exchanging or sharing electrons with each other
a. nucleus
b. ion
c. proton
d. electron cloud
e. molecule
e
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Possible equations (choose the correct one): ? =10^12/H; H=v/d. If gravity is unimportant and H equals 75 km/s/Mpc, then the age of the universe is about
a. 8.9 billion years. b. 13 billion years. c. 16.6 billion years. d. 26 billion years. e. 74 billion years.
Which of the following cases in the Drake equation would be the minimum necessary condition for us to be the only intelligent civilization currently in our galaxy?
A) any two of the factors to be zero B) any three of the factors to be zero C) all of the factors to be zero D) any one of the factors to be zero
A circular coil with 600 turns has a radius of 15 cm. The coil is rotating about an axis perpendicular to a magnetic field of 0.020 T
If the maximum induced emf in the coil is 1.6 V, at what angular frequency is the coil rotating? A) 0.30 rad/s B) 1.9 rad/s C) 1.4 rad/sec D) 0.60 rad/s E) 0.90 rad/s
State the principle of conservation of mechanical energy
What will be an ideal response?