A 40-lb container of peat moss measures 14x20x30 in. A 40-lb container of topsoil has a volume of 1.9 gal. (a) Calculate the average densities of peat mass and topsoil in units of g/cm3. Would it be correct to say that peat moss is "lighter" than topsoil? Explain. (b) How many bags of the peat moss are needed to cover an area measuring 10 ft. by 20 ft. to a depth of 20 in.?

Question

anonymous · Answer

@BarbaraKara 

Please help me with this problem. :3

anonymous · Answer

My letter (A) is 0.1 g/cm3. I'm not really sure about my answer.

anonymous · Answer

is lb pounds?

anonymous · Answer

Yes

anonymous · Answer

okay, to be honest, i have no idea how to convert these measurements - im only used to metric! im really sorry!

anonymous · Answer

Ohh. Okay, it's alright. Thanks for the help ^_^

anonymous · Answer

@Festinger : please help me with this. :3

festinger · Answer

i don't like to work with pounds and inches too. oh and feet. sorry.

festinger · Answer

Just cancel off the units by multiplying 1:
as an example I want to convert km/h to m/s

1m=1000km
1h=3600s

so:
$$\frac{km}{h}=\frac{\cancel{km}}{h}*1*1=\frac{km}{\cancel{h}}*\frac{1000m}{\cancel{km}}*\frac{\cancel{1h}}{3600s}=$$

$$Density=\frac{mass}{volume}$$

use google. they provide unit convertors fr you to check your answers!