Friday

July 25, 2014

July 25, 2014

Posted by **Casey** on Thursday, January 12, 2012 at 6:47pm.

Thank you!

1. In physics, the formula for centripetal force is F =

mv^2/

r

where m is the mass, v the velocity, and r the radius.

a) Find the length of a string when a mass of 2.4kg is being spun at a speed of 5 m/sec if the centripetal force

is 15.8 N. Round your answer to the nearest tenth.

Answer: 3.8m

----------------------------------------

b) What length would the string need to be to increase the force to 20.5 N if the speed is 5 m/sec and the

mass is 2.4 kg?

Answer: 2.9m

---------------------------------------

c) If the string is made longer, but the mass and velocity are kept the same, how will this effect the force?

d) What would be the effect on the centripetal force if the mass and velocity were kept the same and the

length of the string was doubled?

- Math -
**Steve**, Friday, January 13, 2012 at 4:21ama and b are ok

since F varies directly with m and v^2, but inversely with r, increasing r decreases F, as you see if you compare the answers to a and b.

since F varies directly with m and v^2, but inversely with r, doubling r halves F.

**Related Questions**

Check Answers Quick -Physics - What causes the centripetal acceleration of an ...

physics - I've just read that the centripetal force on an electron is mv^2/r; ...

physics - there are 3 parts to my question. i need help on the last part. 1.a. A...

Physics-Please check if I did this correctly - I posted this question this ...

HELP! PHYSICS LABS!! - CAN someone please help me...I am so confused and I have ...

Physics LAST QUESTION - A beetle whose mass is 2 g sits on a turntable at a ...

Physics - posted this question this morning but I'm not sure of the response ...

Physics - i have been asking physics questions on this and some people give me ...

physics.. important stuff ! - i still do not understand?? can someone please ...

physics - A child is twirling a 0.0100 kg ball on a string in a horizontal ...