February 9th, 2009, 02:53 PM  #1 
Senior Member Joined: Nov 2008 Posts: 265 Thanks: 0  related rates
the cross section of a 5 meter trough is an isosceles trapezoid with a 2 meter lower base, a 3 meter upper base, and an altitude of 2 meters. Water is running into the trough at a rate of 1 cubic meter per minute. how fast is the water level rising when the water is 1 meter deep. i need help doing this problem thank you for any help. 
February 9th, 2009, 03:33 PM  #2 
Global Moderator Joined: Dec 2006 Posts: 18,718 Thanks: 1533 
Let h denote the depth. What is the area of the exposed water surface in terms of h?

February 9th, 2009, 04:57 PM  #3 
Senior Member Joined: Nov 2008 Posts: 265 Thanks: 0  Re: related rates
im sorry but i still dont understand' would the area be A=1/2(1st base + 2nd base)h 
February 12th, 2009, 05:52 AM  #4 
Global Moderator Joined: Dec 2006 Posts: 18,718 Thanks: 1533 
What did you not understand? What happens to the area of the exposed water surface as h increases from zero meters to two meters?


Tags 
rates, related 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Related Rates  ChloeG  Calculus  2  November 8th, 2011 04:11 PM 
related rates  kfarnan  Calculus  2  October 13th, 2011 03:18 PM 
related rates :)  AussieJason  Calculus  1  September 2nd, 2011 04:40 PM 
Related Rates?????????  imcutenfresa  Calculus  4  September 24th, 2009 12:22 PM 
Related Rates Help Please  pranavpuck  Calculus  11  November 30th, 2008 09:32 AM 