Posted by **asian** on Monday, December 13, 2010 at 10:30pm.

An athlete whirls a 7.00 kg hammer tied to the end of a 1.1 m chain in a horizontal circle. The hammer makes one revolution in 0.9 s. What is the tension in the chain?

- 11th grade pre ap physics -
**drwls**, Tuesday, December 14, 2010 at 7:09am
The speed of the hammer must be

V = 2 pi*1.1/0.9 = 7.68 m/s. The chain cannot not be quite horizontal, but tipped at an angle A (to support the weight) so that

M V^2/R = T cos A and

M g = T sin A

tan A = g R/V^2 = 0.183

which means that

A = 10.3 degrees

T = (M V^2/R)/cos10.3 = ______

If you do not include the cos 10.5 factor, your answer will be about 2% off.

- 11th grade pre ap physics -
**Corey**, Wednesday, January 5, 2011 at 7:30pm
This is the wrong answer, do not copy it

- 11th grade pre ap physics -
**vinay**, Monday, January 2, 2012 at 11:33pm
396 (approx)

- 11th grade pre ap physics -
**vinay**, Monday, January 2, 2012 at 11:34pm
396 N (approx)

- 11th grade pre ap physics -
**ShMuel**, Thursday, March 7, 2013 at 10:51pm
A single electron is placed in an electric field where the intensity 103.5 N/c. What force does the electron experience?

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