A researcher estimated that there were eight billion grains of sand per cubic meter on one particular beach. If the mass of one of these grains of sand is approximately 3.5 × 10–7 grams, what is the approximate mass of one cubic meter of sand on this particular beach?
Steps would be helpful!!
Question involving scientific notation and negative integers?
2017-08-20 4:08 am
回答 (3)
2017-08-20 9:49 am
8 billion = 8 x 10^9
That times 3.5 x 10^(-7) =
28 x 10^2 =
2.8 x 10^3 grams =
2.8 kg
That times 3.5 x 10^(-7) =
28 x 10^2 =
2.8 x 10^3 grams =
2.8 kg
2017-08-20 4:29 am
(3.5 x 10^(-7) grams)*(8 x 10^9)
= 28 x 10^2 grams = 2.8 kg.
Very unlikely! The density of dry sand is more likely 1500-2000 kg/m^3.
Oh well, you can't correct their nonsense!
= 28 x 10^2 grams = 2.8 kg.
Very unlikely! The density of dry sand is more likely 1500-2000 kg/m^3.
Oh well, you can't correct their nonsense!
2017-08-20 4:19 am
(8 * 10^9) * (3.5 * 10^(-7)) = 28 * 10^(9-7) = 2.8 * 10^3 g
= 2,800 g = 2.8 kg
it's a bit too light for 1 m^3 o_o
Is billion 1,000,000,000 or 1,000,000,000,000? :|
British English => 1,000,000,000,000:
(8 * 10^12) * (3.5 * 10^(-7)) = 28 * 10^5 = 2.8 * 10^6 g
= 2.8 * 10^3 kg = 2800 kg, a bit too heavy this time? 😧😣
= 2,800 g = 2.8 kg
it's a bit too light for 1 m^3 o_o
Is billion 1,000,000,000 or 1,000,000,000,000? :|
British English => 1,000,000,000,000:
(8 * 10^12) * (3.5 * 10^(-7)) = 28 * 10^5 = 2.8 * 10^6 g
= 2.8 * 10^3 kg = 2800 kg, a bit too heavy this time? 😧😣
收錄日期: 2021-04-24 00:43:43
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20170819200845AAMwtxm