May 10th, 2016, 08:48 AM  #1 
Newbie Joined: May 2016 From: preston Posts: 3 Thanks: 0  Radius of a cylinder  help please
There are two cylinders Cylinder A and Cylinder B. There is also a hollow hole that has the same radius as cylinder A. Cylinder A weighs 100kg. Cylinder B is lighter and smaller than cylinder A. Both cylinders have the same thickness. When the edge of Cylinder B is just past the centre of the hole (that has the same radius as Cylinder A) it falls inside the hole. QUESTIONS: 1) What is the radius of cylinder A? 2) What is the weight of cylinder B? PS: the question does not give any other numerical values to work with 
May 10th, 2016, 08:57 AM  #2 
Senior Member Joined: Dec 2012 From: Hong Kong Posts: 853 Thanks: 311 Math Focus: Stochastic processes, statistical inference, data mining, computational linguistics 
It seems that some clarification is needed. What is the 'thickness' of a cylinder? and what do you mean by 'just past' the centre of the hole?

May 10th, 2016, 09:36 AM  #3 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,597 Thanks: 1039  
May 10th, 2016, 09:53 AM  #4 
Newbie Joined: May 2016 From: preston Posts: 3 Thanks: 0 
The question just says thickness. I'm assuming it refers to the height of the cylinder. Last edited by skipjack; May 10th, 2016 at 10:38 AM. 
May 10th, 2016, 09:54 AM  #5 
Newbie Joined: May 2016 From: preston Posts: 3 Thanks: 0 
Smaller in area of the circle. Hence the volume would be less. And lighter in mass

May 10th, 2016, 10:00 AM  #6 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,597 Thanks: 1039 
Too many "assumes" for me. Qwerty will solve that in a jiffy for you Assuming the jiffy is less in volume than cylinder B's weight... 

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cylinder, density, equations, mass, radius 
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