Question

Can someone please check my answers?
Thanks!
(ﾉ^ヮ^)ﾉ*:･ﾟ✧*:･ﾟ✧

Answer 1

Write the following measurements in scientific notation:

a. 22 000 mg

22 * 10^3

b. 0.005 km

.5 * 10^3

c. 65 900 000 m

65.9 * 10^5

d. 0.000 003 7 kg

0.37 * 10^6

Answer 2

Did I get any right?

Answer 3

Nope

Answer 4

What?! D:
What am I doing wrong?

Answer 5

scientific notation form :

\[\large \times \cdot \times\times\times\times\times* 10^{\times\times\times\times}\]

Answer 6

there should be ONLY ONE digit before the decimal point

Answer 7

a. 22 000 mg

22 * 10^3 mg

but this is NOT scientifc notation

Answer 8

*and if I may add, everytime you write something in scientific notation, you should put a decimal point*

Answer 9

b and d look carefully

Answer 10

Here is two examples of numbers written in scientific notation:

\[523=5.23 \times 10^2 \]
\[0.525=5.25 \times 10^{-1}\]

Answer 11

that one digit before the decimal point make sure to not choose it to be 0

Answer 12

Okay, that kind of makes sense..
So would a be 2.2 x 10^3 ?

Answer 13

yes, what about the units ?
you don't want to change units to SI in scientific notation ? what does your textbook/teacher say ?

Answer 14

hey actually its a NO...

22 x 10^3

is not same as

2.2 x 10^3

Answer 15

It doesn't say anything about the SI units.

Answer 16

Is the 2.2 part right?

Answer 17

ok then less work for you :)

Answer 18

yes that part is right !

Answer 19

Oh good, so all I have wrong is how many places, then.. so wait, it should be to the fourth?
So 2.2 x 10^4 ?

Answer 20

You got it !

Answer 21

YAY!!!! Finally!! XD

Answer 22

*fireworks go off in the back*

Answer 23

next one can be tricky

Answer 24

So you count everything AFTER the decimal point as the number of digits?

Answer 25

Yea

Answer 26

Exactly ! thats nice way to put it

Answer 27

Okay, cool.
So for the next one... would it be 5 x 10 ^-3 ?

Answer 28

who ate the decimal point

Answer 29

pac man! XD jk

Answer 30

5.0 x 10^-3

is more like scientific form :)

Answer 31

oh, so you need to have a decimal point in the front all the time? (I hate decimals)

Answer 32

lol i was a pacman addict once

Answer 33

yes decimal point is a must for scientists

Answer 34

^ Same haha
And okay

Answer 35

So 5.0 x 10^(-3)

Answer 36

looks good if we pretend we're not concerned with significant figures

Answer 37

significant figures is a more tricky business, save it for later :)

Answer 38

Significant figures? Does that deal with the measurements?

Answer 39

yes, but one thing at a time

Answer 40

you need to study scientific notation before touching significant figures topic

Answer 41

Well, there was a question before on this same study quiz that said something about it.

Answer 42

This thing isn't graded tho, it's just to be used as notes for the test.. I skipped that question, but is it something I should know?

Answer 43

Yes you should know, but I think we can work the rpesent problem without refering to them

Answer 44

Okay, cool. ^.^
Do you want me to post the others in separate threads?
There's only c and d left for this question.

Answer 45

lets finish here

Answer 46

c. 65 900 000 m

Answer 47

you just need to figure out two things :

1) where to put the decimal point
2) exponent of 10

Answer 48

Umm...
65.9 x 10^6 ?

Answer 49

remember, only one digit to the left of decimal point

Answer 50

it should be

6.59 x 10^7 ?

Answer 51

Hey remember to include the units

Answer 52

Ohhhhhhhh I get it!

Answer 53

So you can't have like:
22.19 x 10^4
Or
143.29 x 10^4
You can only have
1.294 x 10^4

Answer 54

thats right !!

Answer 55

Aha! Okay.
So
6.59 x 10^7

Answer 56

this is just one of those times where you just need to follow the rules

Answer 57

yes!

Answer 58

Okay, so the last one is really confusing looking.
Would it be
0.37 x 10^(-7) ?

Answer 59

first digit cannot be 0

Answer 60

so moce the decimial point to right by one more position

Answer 61

3.7 x 10^-7?

Answer 62

d. 0.000 003 7 kg

is same as
0.00 003 7 x 10^(-1)kg

is same as
0.0 003 7x 10^(-2) kg

is same as
0.003 7 x 10^(-3)kg

is same as
0.03 7 x 10^(-4)kg

is same as
0.3 7 x 10^(-5)kg

is same as
3. 7 x 10^(-6)kg

Answer 63

only the last line is in scientific form

Answer 64

Okay, so for the powers, you only count the number of zeroes?

Answer 65

n * 10^3 : shifts the decimal point of number n to RIGHT by 3 positions

n * 10^(-3) : shifts the decimal point of number n to LEFT by 3 positions

Answer 66

i will leave this to @ganeshie8, must better idea lol

Answer 67

im bit dyslexic about left and right, so i always need to double check 2-3 times when messing with powers

Answer 68

Ohhh okay.

Answer 69

xx.xxxx * 10^3 = xxxxx.x

Answer 70

xx.xxxx * 10^(-3) = 0.0xxxxxx

Answer 71

Okay, that makes sense.
I gotta go for a bit, supper, but I'll be back. ^.^
\(\huge\bf\rlap{\color{red}{\bigstar~T}\color{gold}{H}\color{greenyellow}{A}\color{lime}{N}\color{cyan}{K~}\color{blue}{Y}\hspace{0 pt}\color{purple}{O}\color{magenta}{U}\color{orchid}{!~\bigstar}}{\color{black}{\; \bigstar~THANK~YOU!~\bigstar}}\)
Is it okay if I tag you in some other questions when I get back? (:

Answer 72

yeah sure :)

Answer 73

Awesome!! Thanks! :D

Answer 74

And remember! I'm still here and I can help! :D

Answer 75

*this is one of those awkward moments when i'm a third wheel XD*

Answer 76

3 wheels is more stable than 2 wheels :)