12th grade PYSICS
posted by Samii .
A 45.7kg boy on a swing moves in a circular arc of radius 3.80 m.At the lowest position, the child's speed reaches 2.78 m/s. Determine the magnitude of the tension in each of the two vertical support chains.
i used mv^2/r, but i keep getting the answer wrong. the answer is suppose to be 270 m/s
please help

A motiom of an objects along the circumference of a circle.

A rock tied to a string is swung around in a circle with a radius of 10 ft. The centripetal acceleration is 16.9 ft/sec2. Calculate the speed of the rock.
Respond to this Question
Similar Questions

physics
A 25kg child on a 2m long swing is released from rest when the swing supports make an angle of 30 degrees with the vertical. (a) Neglecting friction, find the child's speed at the lowest position. (b) If the speed of the child at the … 
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 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 45.7kg boy on a swing moves in a circular arc of radius 3.80 m.At the lowest position, the child's speed reaches 2.78 m/s. Determine the magnitude of the tension in each of the two vertical support chains. i used mv^2/r, but i keep … 
PHYSICS
A 27.0 kg child on a 3.00 m long swing is released from rest when the swing supports make an angle of 31.0° with the vertical. Neglecting friction, find the child's speed at the lowest position. 
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
A 45.7kg boy on a swing moves in a circular arc of radius 3.80 m.At the lowest position, the child's speed reaches 2.78 m/s. Determine the magnitude of the tension in each of the two vertical support chains 
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
Problem 3 A 40 kg child swings in a swing supported by two ropes, each 3 m long. (a) If the tension in each rope at the lowest point is 350 N, a. find the child's speed at the lowest point. b. the force exerted by the seat on the … 
physics
A 25.0kg child on a 3.00mlong swing is released from rest when the ropes of the swing make an angle of 31.0° with the vertical. (a) Neglecting friction, find the child's speed at the lowest position. m/s (b) If the actual speed …