Social Anxiety Support

shyvr6 · 11-04-2009, 12:31 PM

Well, I already got this question wrong, but I have a test tomorrow, and I want to make sure I get any more questions correct in the future. So here is the question:

Rank them from the most buoyant to the smallest. Ties are possible.

Thanks for any help!

max4225 · 11-04-2009, 03:04 PM

(float)bf~a, dc~e(sink)? Anything with a volume/weight ratio less than 100 (1/.01) will sink.

mind_games · 11-04-2009, 07:57 PM

I err disagree with max4225

The most buoyant to the least is:
B,F,A,DE,C (D and E are tied)

Working:

Just to make sure my eyesight isn't failing me, I'm reading the values as:
A=1.4N, 150ml
B=2.0N, 300ml
C=3.0N, 230ml
D=3.5N, 300ml
E=2.0N, 150ml
F=2.0N, 230ml

So 1ml=0.01N
So since all volume are listed in ml, multiply all the volumes by 0.01 to get the force of buoyancy in Newtons.

So for A, there is 1.4N of weight acting downwards and 150ml x 0.01=1.5N of buoyancy force acting upward. End result is (1.5-1.4)=0.1N acting upward (it'll float).

Doing this for the rest gives:
A=0.1N up (float),
B=1.0N up (float),
C=0.7N down (sink),
D=0.5N down (sink),
E=0.5N down (sink),
F=0.3N up (float)

So the most buoyant to the least is:
B,F,A,DE,C (D and E are tied)

shyvr6 · 11-04-2009, 10:27 PM

Quote:

Originally Posted by mind_games

End result is (1.5-1.4)=0.1N acting upward

Oh geez, I'm so stupid. That's what I forgot to do. I had the 1.5, but I forgot to minus it with the weight. Thanks guys for you help!

millenniumman75 · 11-04-2009, 10:37 PM

Got any more of those?

They were pretty cool - what class is this for?

shyvr6 · 11-04-2009, 10:43 PM

Descriptive physics. Oh, I have plenty more, but I try not to post them if I don't have to, heh. Here is another one but dealing with air. Same answer concept as the first question.

11-04-2009, 12:31 PM	#1 (permalink)
shyvr6 Status: Makin Waves Join Date: Feb 2008 Location: Somewhere on a map. Gender: Male Posts: 9,645	Buoyancy Ques. Well, I already got this question wrong, but I have a test tomorrow, and I want to make sure I get any more questions correct in the future. So here is the question: Rank them from the most buoyant to the smallest. Ties are possible. Thanks for any help! __________________ Music

11-04-2009, 07:57 PM	#3 (permalink)
mind_games Status: dances, like a fridge Join Date: Nov 2008 Age: 23 Posts: 1,570	I err disagree with max4225 The most buoyant to the least is: B,F,A,DE,C (D and E are tied) Working: Just to make sure my eyesight isn't failing me, I'm reading the values as: A=1.4N, 150ml B=2.0N, 300ml C=3.0N, 230ml D=3.5N, 300ml E=2.0N, 150ml F=2.0N, 230ml So 1ml=0.01N So since all volume are listed in ml, multiply all the volumes by 0.01 to get the force of buoyancy in Newtons. So for A, there is 1.4N of weight acting downwards and 150ml x 0.01=1.5N of buoyancy force acting upward. End result is (1.5-1.4)=0.1N acting upward (it'll float). Doing this for the rest gives: A=0.1N up (float), B=1.0N up (float), C=0.7N down (sink), D=0.5N down (sink), E=0.5N down (sink), F=0.3N up (float) So the most buoyant to the least is: B,F,A,DE,C (D and E are tied) __________________ "this is not me, this is me reacting to your perception of me"

11-04-2009, 10:37 PM	#5 (permalink)
millenniumman75 Status: Super Moderator Join Date: Feb 2005 Location: Dayton-Cincinnati, OH Gender: Male Age: 34 Posts: 38,668	Got any more of those? They were pretty cool - what class is this for? __________________ millenniumman75 You are a success story waiting to happen! Live and let live VACUUMS more than a Hoover.... Live and HELP live is better!

11-04-2009, 10:43 PM	#6 (permalink)
shyvr6 Status: Makin Waves Join Date: Feb 2008 Location: Somewhere on a map. Gender: Male Posts: 9,645	Descriptive physics. Oh, I have plenty more, but I try not to post them if I don't have to, heh. Here is another one but dealing with air. Same answer concept as the first question. __________________ Music

11-04-2009, 03:04 PM	#2 (permalink)
max4225 Status: SAS Member Join Date: Sep 2006 Location: Great Basin Desert by lilac bushes Gender: Male Posts: 695	(float)bf~a, dc~e(sink)? Anything with a volume/weight ratio less than 100 (1/.01) will sink.