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    Another seemingly easy forces question

    The force thought with 150N has three significant figures. Leading zeros are not included in significant figures but trailing zeros are. The right answer was found but on a test it is always best to account for significant figures and I have always been expected too. Here is a link on a brief...
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    Another seemingly easy forces question

    The blocks acceleration is 2.53m/s^2 which is three significant figures so an answer of 37.5kg is correct. Just don't forget the correct units.
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    Planetary system being born

    We must remember what we see is millions if not billions of years old and since then star formation may have slowed along with the formation of planetary systems. This paper http://www.naoj.org/Pressrelease/2012/11/05/index.html proposes that the universe has already made most of the stars it...
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