Sunday

January 25, 2015

January 25, 2015

Posted by **Aaron** on Sunday, March 1, 2009 at 2:49pm.

I don't understand; how can I do this without knowing the daredevil's weight?

- Physics - please help I don't get it -
**Aaron**, Sunday, March 1, 2009 at 3:31pmplease I really need help with this

- Physics -
**Damon**, Sunday, March 1, 2009 at 4:21pmThe falling distance as a function of angle is f = 24 cos A

where A is the angle between the line and the wall of the target building. It starts out at A = 90 and if he got there, ends at A = 0

The component of the weight along the line is m g cos A

(1/2) m v^2 = m g f = m g (24 cos A)

so

v^2 = 48 g cos A

The centripetal acceleration is

v^2/r = 2 g cos A

The tension in the line at breaking = 2 m g + m g cos A which is the mass times the centripetal acceleration

T - m g cos A = 2 m g cos A

T = 3 m g cos A

so when T = 2 m g

2 m g = 3 m g cos A

cos A = 2/3

A = 48.2 deg

distance fallen = 24 cos 48.8

= 24(2/3) = 16

an 24 - 16 = 8 above ground

cos A = 1

A = 0

That is right at the ground.

- Physics -
**Aaron**, Sunday, March 1, 2009 at 4:41pmwow, that was more elaborate than I thought it would be. Thank you so much for answering my qustion. :]

- Last lines irrelavant -
**Damon**, Sunday, March 1, 2009 at 4:50pmThese were just to keep my geometry in mind.

cos A = 1

A = 0

That is right at the ground.

**Answer this Question**

**Related Questions**

Math help please - 2. –3m(m + 8) –3m^2 + 24 –3m^2 – 24m –24m^2 –4m + 5 4. (3x + ...

physics - Calculate the acceleration of a ball that starts from rest, rolls down...

physics - Tarzan swings on a 23.2 m long vine initially inclined at an angle of ...

physics - Tarzan swings on a 28.0 m long vine initially inclined at an angle of ...

physics... - Tarzan swings on a 26.2 m long vine initially inclined at an angle ...

Physics - Tarzan swings on a 27.0 m long vine initially inclined at an angle of ...

ap Physics - AP PROBLEM CHILD ON A SWING AN ADULT EXERTS A HORIZONTAL FORCE ON A...

physics - Tarzan swings on a 34.0-m-long vine initially inclined at an angle of ...

Physics - Tarzan swings on a 27.0 m long vine initially inclined at an angle of ...

Physics - A 35kg child is swinging on a swing with length 2.8m to the bottom of...