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 04-18-2012, 09:36 PM #1 Senior Member   Join Date: May 2009 Posts: 419 Mcat pendulum question~~ SDN Members don't see this ad. (About Ads) A pendulum consists of an object of mass m = 1.65 kg swinging on a massless string of length l. The object has a speed of 1.97 m/s when it passes through its lowest point. If the speed of the object is 0.87 m/s when the string is at 70° below the horizontal, what is the length of the string? The relavent info is Ek= 1/2 mv^2 Ep= mgh
04-19-2012, 01:03 AM   #2
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Quote:
 Originally Posted by johnwandering A pendulum consists of an object of mass m = 1.65 kg swinging on a massless string of length l. The object has a speed of 1.97 m/s when it passes through its lowest point. If the speed of the object is 0.87 m/s when the string is at 70° below the horizontal, what is the length of the string? The relavent info is Ek= 1/2 mv^2 Ep= mgh
I'm just guessing, but wouldn't you find energy change and
divide that by the ac, since ac = tension? could be wrong

04-19-2012, 05:29 AM   #3
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Quote:
 Originally Posted by johnwandering A pendulum consists of an object of mass m = 1.65 kg swinging on a massless string of length l. The object has a speed of 1.97 m/s when it passes through its lowest point. If the speed of the object is 0.87 m/s when the string is at 70° below the horizontal, what is the length of the string? The relavent info is Ek= 1/2 mv^2 Ep= mgh
I get roughly 1.6 m without using a calculator. What are the choices?

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