The planets of the solar system were formed
a) as condensations/accretions of hot gases ejected from the Sun
b) by the accumulation of many comets
c) by a near collision between the Sun and a nearby star
d) as individual condensation/accretion centers in a rotating solar nebula
e) by the collapse of a single higher mass star into a black hole
Ans: d) as individual condensation/accretion centers in a rotating solar nebula
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Two mirrors are at right angles to one another. If an object is placed near the mirrors, what is the largest number of images that would be seen in the mirrors?
a. 3 b. 2 c. 4 d. 5 e. 6
Which of the following best describes the current status of the debate over evidence for life in the Martian meteorite ALH84001?
A) Most scientists now agree that the meteorite shows clear evidence of past life on Mars. B) Most scientists now agree that the meteorite shows no evidence for past life on Mars. C) Most scientists agree that the evidence would support life if the meteorite truly comes from Mars, but few scientists accept that the meteorite is from Mars and instead think it is an ordinary Earth rock. D) Most scientists find the evidence intriguing but suspect that it can be explained without requiring past life on Mars.
Inflation explains the horizon and flatness problems
a. True b. False Indicate whether the statement is true or false
A 400-kg box is lifted vertically upward with constant velocity by means of two cables pulling at 40.0° on either side of the vertical direction. What is the tension in each cable?
A) 231 N B) 400 N C) 800 N D) 2560 N E) 3920 N