# Math Help - Conversion:

1. ## Conversion:

Thanks for the help

-qbkr21

2. Originally Posted by qbkr21
Thanks for the help

-qbkr21

No.

you have to convert inches to centimeters before you carry out your calculations.

1 inch = 2.54 cm

so your volume is $[4(2.54)]^3$

i don't get what you did for the last part. what formula are you using? should you not use weight = mass*gravity ?

3. Originally Posted by Jhevon
No.

you have to convert inches to centimeters before you carry out your calculations.

1 inch = 2.54 cm

so your volume is $[4(2.54)]^3$

i don't get what you did for the last part. what formula are you using? should you not use weight = mass*gravity ?
(length)^3 = Volume

*Is there a rule that I am missing? Must the length always be in cm before it's cubed?

Thanks,
qbkr21

4. Originally Posted by qbkr21
(length)^3 = Volume

*Is there a rule that I am missing? Must the length always be in cm before it's cubed?

Thanks,
qbkr21
That's because the density is given in cm^3, so you have to choose either cm, either inches, but not the 2 at the same time !

5. I converted the inches to cm and found it to equal 10.16

so...

(10.16)^3 = 1048.77 (This now my volume?)

So

Density = mass/ volume

(19.3)/ = (x)/(1048.77) = 20241.3 grams

1 lb. = 453.59 g

(20241.3 grams)(1 lb. / 453.59 grams) = 44.6247 lbs.

Correct?

6. Originally Posted by qbkr21
I converted the inches to cm and found it to equal 10.16

so...

(10.16)^3 = 1048.77 (This now my volume?)

So

Density = mass/ volume

(19.3)/ = (x)/(1048.77) = 20241.3 grams

1 lb. = 453.59 g

(20241.3 grams)(1 lb. / 453.59 grams) = 44.6247 lbs.

Correct?
looks good.

so you didn't use weight = mass*gravity, you used a conversion factor from grams to pounds. ok

7. Originally Posted by Jhevon
looks good.

so you didn't use weight = mass*gravity, you used a conversion factor from grams to pounds. ok
Suppose I did want to use the formula above weight = mass*gravity...

Would I not only have to convert the given inches to meters but also the density for gold 19.3 g/cm^3 to just g/m^3?

8. Originally Posted by qbkr21
Suppose I did want to use the formula above weight = mass*gravity...

Would I not only have to convert the given inches to meters but also the density for gold 19.3 g/cm^3 to just g/m^3?
yeah...too much work, huh? your way is fine