PHYSICS PLEASE HELP
posted by Holly .
A 80 kg child sits in a swing suspended with 2.6 mlong ropes. The swing is held aside so that the ropes make an angle of 46 o with the vertical. Use conservation of energy to determine the speed the child will have at the bottom of the arc when she is let go.

(M/2)Vmax^2 = M g L(1  cos46)
L(1 cos 46) is the maximum rise of the swing above the bottom position, where the velocity is Vmax
Vmax = sqrt[2 g L (1cos46)] 
does 1cos46 represent L or is L part of that equation?

L is the rope length, and is part of the equation. I already told you what
L*(1 cos 46) is .
Respond to this Question
Similar Questions

Physics
A 40.0kg child is in a swing that is attached to ropes 2.00m long. Find the gravitational potential energy associated with the child relative to the child's lowest position under the following conditions: a) When the ropes are horizontal … 
physics
A 39.5 N child is in a swing that is attached to ropes 2.01 What is the gravitational potential energy when the ropes make a 32.1° angle with the vertical? 
physics
A 100N child is in a swing that is attached to ropes 1.90 m long. Find the gravitational potential energy (b) when the ropes make a 35.0° angle with the vertical c) when the child is at the bottom of the circular arc 
physics
A 120 N child is in a swing that is attached to ropes 2.20 m long. Find the gravitational potential energy of the childEarth system relative to the child's lowest position at the following times. (a) when the ropes are horizontal … 
Physics
A 40 kg child sits in a swing suspended with 2.5 m long ropes. The swing is held aside so that the ropes make an angle of 15 degrees with the vertical. Use the conservation of mechanical energy to determine the speed the child will … 
Physics Energy and Work Done
A 390N child is in a swing that is attached to a pair of ropes 1.9 m long. Find the gravitational potential energy (in JOULES) of the child–Earth system relative to the child's lowest position at the following times. A) when the … 
Physics PLEASE HELP
A 80 kg child sits in a swing suspended with 2.6 mlong ropes. The swing is held aside so that the ropes make an angle of 46 o with the vertical. Use conservation of energy to determine the speed the child will have at the bottom … 
Physics
A 350 N child is in a swing that is attached to a 7.50 m long rope. find the gravitational potential energy associated with the child relative to her lowest position when a) the ropes are horizontal, (b) the ropes make a 30 degree … 
Physics
A 50 kg child sits in a swing suspended with 3.8 mlong ropes. The swing is held aside so that the ropes make an angle of 48 o with the vertical. Use conservation of energy to determine the speed the child will have at the bottom … 
Physics
A400 N child is swing that is attached tow ropes 2m long , find the gravitational potential energy of the childearth system relative to the red line level when ropes make an angle with the vertical .