Homework Help: Physics

Posted by Cat on Wednesday, January 23, 2013 at 12:29pm.

For the normal force in the drawing to have the same magnitude at all points on the vertical track, the stunt driver must adjust the speed to be different at different points. Suppose, for example, that the track has a radius of 4.84 m and that the driver goes past point 1 at the bottom with a speed of 16.6 m/s. What speed must she have at point 3, so that the normal force at the top has the same magnitude as it did at the bottom?

Physics - drwls, Wednesday, January 23, 2013 at 12:39pm
What drawing? Where is point 3?

We are not clairvoyant.
Physics - Cat, Wednesday, January 23, 2013 at 12:43pm
How do I attach photos?
Physics - Cat, Wednesday, January 23, 2013 at 12:44pm
It is located on the top
Physics - Cat, Wednesday, January 23, 2013 at 12:48pm
It is located on the top
Physics - Cat, Wednesday, January 23, 2013 at 12:52pm
I figured it out.

2mg=mv3^2/r-mv1^2/r

V3 being the speed at the top and V1 being the speed given at the bottom

set them equal: V3^2=2gr+V1^2

sqrt(2*9.8*4.84+16.6^2)

V3= 19.2459 m/s

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