A Hi-Vol Sampler Draws Air At An Average Rate Of 70 Ft3/min.

[Professy]

A hi-vol sampler draws air at an average rate of 70 ft3/min. If the measured particle concentration is 200 ~g/m3 and the hi-vol was operated for 12 hours, what was the weight of dust on the filter?

[Nical]

Didn't you ask this earlier?

[TonyV]

quite a lot.

[scorpiojo]

I've a feeling there's more to come..

[Professy]

y'all planning on helping me or what? this is what this page is about right? I have an assignment due in 2 hours.

[TonyV]

I have all the time in the world today Scorpio.

[TonyV]

We or at least I am not a homework club, you will never learn anything by getting other people doing you assignments for you. Never mind helping anybody out.

[drmorgans]

You have posted a series of quite complex scientific / engineering problems and haven't really asked for "help", actually solutions. If you really are starting to tackle them a couple of hours before they are due, then that's bad planning. You really need to have a chat with your tutor and get some help.

[davebro]

It depends on the particle size(s) and the grade of the filter.

[Professy]

Thank you Dave. At least you're not trying to be my parents like Scorpio, Tony and Dr. Morgans. I just discovered this page, so yeah.

[scorpiojo]

Have y'all not done any of this work?

[Old_Geezer]

Somebody needs to be looking after your interests since you don't appear to be doing so. Doing your assignments for you won't help in the long run. You need parental type advice to realise you need to take in lectures, course, and book studies in good time, or else you'll gain no real understanding or capability. Go see your tutor and 'turn over a new leaf' regarding your college strategy, or you'll gain little by being there.

[bhg481]

Isn't it funny; we all seem to be agreeing with ypur parents. Something to reflect on, perhaps.

[Professy]

mmh, you guys are right. I won't hand it in anymore. I'm okay with the mark i'll get

[davebro]

I've done the sums assuming ALL the dust is filtered out - simple arithmetic & converting ft3 to m3 and I get quite a large number as an answer. Can you give me your figure for comparison?

PS. Assuming also that ~g means grams.

[KARL]

First and most important piece of advice: Use imperial measure if you want to make life difficult, metric if you don't, but ALWAYS stick to the same system of measurement.