Astronomers who subscribe to the Big Bang theory believe the Big Bang occurred
A) about 14 billion years ago.
B) at the beginning of time.
C) both of these
D) neither of these
Answer: C
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A sled weighs 10.0 kg It is held in place on a frictionless 20.0 degree slope by a rope attached to a stake at the top of the slope. Find the tension in the rope if it is parallel to the slope.
A. 47.9 N B. 37.4 N C. 94.1 N D. 33.5 N E. 23.8 N
An object that is 47.5 cm tall forms an image that is 38.6 cm tall and 14.8 cm from a spherical mirror. How far is the object from the mirror?
A) 124 cm B) 47.6 cm C) 18.2 cm D) 12.0 cm
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What will be an ideal response?
If two protons and two neutrons are removed from the nucleus of an oxygen atom, a nucleus of which element remains?
A) nitrogen-12 B) carbon-12 C) neon-18 D) carbon-14