Write the following in scientific notation in their respective SI units ( 3 dig fig)
a) 286.6 km
b) 0.864um
c) 760mg
d) 62.1 ps
You're welcome.
Perhaps you should explain what you don't understand about this. I'll do a couple for you to get you started. For scientific notation, you place the decimal to the right of the FIRST number and follow that with x 10^y where y is the number of places to the right or left that you moved the decimal from its initial resting place. Since you want 3 digits you round the third digit if there are more.
286.6 km rounds to 287 and that is 2.87 x 10^2 km
0.864 um stays 0.864 um and that is 8.64 x 10^-1 um
Since it isn't easy to type subscripts and superscripts on the keyboard, the new way of writing these is to let E replace the x 10 then follow that by the y value in 10^y. Those two examples above then become
2.87E2 and 8.64E-1.
You do the other two. I shall be happy to check your work if you wish.
It got me confuse the km ....in the end
Yes I wish to check my work
That km, um, mg, and ps are just the units and don't have anything to do with writing in scientific notation. km is kilometers, um is micrometers, mg is milligrams, ps is picoseconds.
So my numbers above would be
2.87E2 km and 8.64E-1 um.
I shall be happy to check your work on the last two if you post it.
2.87 x 10^5
8.64x10^ negative 7
7.60x10^negative 1
6.21x10^ negative 11
I eleminated
km
286.6/1km x 1000 m/ 1km = 286600. 2.87x10^ 5 m
Is it wrong or I live the way it is in km
0.864. 8.64x10^ -1 um
760mg. 7.60 x10^2
62.1ps. 6.21x 10^1