Complete the equation: CH3C?CCH3 + 2 H2 ? ____________________
Fill in the blank(s) with correct word
CH3CH2CH2CH3
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Which of the following statements is true of protostars?
A) They are luminous red objects. B) They are smaller than main-sequence stars. C) They have completely collapsed. D) They have temperatures that are more than 10,000 K.
A block of mass M slides down a frictionless plane inclined at an angle ? with the horizontal. The gravitational force is directed
A) parallel to the plane in the same direction as the movement of the block. B) parallel to the plane in the opposite direction as the movement of the block C) perpendicular to the plane. D) toward the center of the Earth. E) toward the center of mass of the block.
Why is there a two-day difference in the sidereal and synodic months?
A) The Moon speeds up at perigee, and slows down at apogee. B) The sidereal day is four minutes shorter than the solar day, and it adds up. C) The Earth is closer to the Sun during the sidereal month. D) The Earth is also revolving around the Sun, so the Moon must "catch up." E) The Moslem lunar year is only 354 days long, on average.
What do you think is the greatest source of error in this experiment? Justify your answer