Consider the following statement, and explain whether or not it is sensible: If you had a very fast spaceship, you could travel to the celestial sphere in about 100 years
What will be an ideal response?
This statement does not make sense because the celestial sphere is a concept and not a physical object.
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An annular solar eclipse occurs
A. when the Moon in its orbit is closest to Earth, and, so not able to cover the complete disk of the Sun. B. every year when the Sun is highest in the sky. C. when the Moon in its orbit is farthest from Earth, and, so not able to cover the complete disk of the Sun. D. None of these choices is correct.
It's cold! You are sitting on what appears to be an ice-covered world (water ice). The Sun is low on the horizon and circles the horizon about once every 24 hours
Despite the low Sun, you can almost "feel" the skin cancers appearing on your exposed face (because there is little ozone to protect you). Despite these discomforts, you are pleased to find that the air is quite satisfactory; oxygen seems plentiful, and you are able to breathe even without the life-support belt.
Which of the following is not key evidence in support of the idea that all life today shares a common ancestor?
A) We have identified fossils of the first life forms that ever existed on Earth. B) All life uses DNA and the same genetic code. C) Mapping of gene sequences shows how life is all related. D) All life builds proteins from the same amino acids and uses ATP to store energy in cells.
An object requires a force of 30 N to hold it under water. The object weighs 90 N in air. Its density is nearest:
