The main lens or mirror of a telescope is called the ____________________
Fill in the blank(s) with correct word
primary lens or mirror
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Which of the following mathematical expressions should be used to calculate the momentum of an auto?
A. mass × velocity B. weight × speed C. weight × force D. mass × acceleration
Is the burning of a match an exothermic reaction?
Why is Neptune denser than Saturn?
A) Neptune has a higher proportion of hydrogen compounds and rocks than Saturn. B) Neptune has a larger mass and stronger gravity than Saturn. C) Neptune has a much more massive core than Saturn. D) Neptune has a greater proportion of helium compared to hydrogen than Saturn.
A problem with the Bohr model of the atom is that electrons circling the nucleus
A) accelerate and should continuously emit radiation. B) lose energy and should spiral into the nucleus. C) both of these D) neither of these