Posted by Luricela on Saturday, March 20, 2010 at 4:20pm.
An athlete whirls a 7.50kg hammer tied to the end of a 1.1m chain in a horizontal circle. The hammer moves at the rate of 1.3 rev/s.(a) What is the centripetal acceleration of the hammer?(b) What is the tension in the chain?

physics  bobpursley, Saturday, March 20, 2010 at 5:05pm
acceleration= w^2 r= (1.3*2PI rad/sec)^2 1.1m
tension= masshammer*acceleration

physics  Luricela, Saturday, March 20, 2010 at 5:35pm
Acctually i just found the answer for the acceleration, its similar to what you said except that you don't square it.The tension is (mass)(acceleration).

physics  bobpursley, Saturday, March 20, 2010 at 6:01pm
well, it is nice to know I have been doing it wrong, apparently, for 50 years.
I see here in Canada they are doing it my way also. Well, they are Canadians.
http://theory.uwinnipeg.ca/physics/circ/node6.html

physics  MathMate, Saturday, March 20, 2010 at 9:33pm
Could it be that I've been doing it wrong for the past 40+ years too, unless of course there is a notsominute chance that the textbook answer is wrong?

physics  Luricela, Sunday, March 21, 2010 at 11:14am
no its just that this is in revolutions per second (goes around the whole circle) when it should be redious per second. most questions just give it in seconds so it would be correct the other way (unless of course it is given in revolutions per second like in this problem).
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