Physics
posted by Meg .
A child pushes a merrygoround with a force of 55.0 N at an angle tangent to the circle (that is, perpendicular to a radius). If the child pushes it through exactly one full circle, and the merrygoround has a radius of 1.15 m, how much work does she do?
The answer is not 518.4 J... this is what I put as my first answer and got it wrong.

W=M•φ =F•R•φ =55•1.15•2•π =397.4 J (!!!!)
Respond to this Question
Similar Questions

Physics
In a playground, there is a small merrygoround of radius 1.20 m and mass 190 kg. Its radius of gyration (see Problem 85 of Chapter 10) is 91.0 cm. A child of mass 44.0 kg runs at a speed of 4.50 m/s along a path that is tangent to … 
Physics
In a playground, there is a small merrygoround of radius 1.20 m and mass 190 kg. Its radius of gyration (see Problem 85 of Chapter 10) is 91.0 cm. A child of mass 44.0 kg runs at a speed of 4.50 m/s along a path that is tangent to … 
physics
A merry go round in the park has a radius of 1.8 m and a rotational inertia of 900 kgm^2. A child pushes the merry go round with a constant force of 80 N applied at the edge and parrallel to the edge. A frictional torque of 12 Nm … 
Physics
A merrygoround in the park has a radius of 1.8 m and a rotational inertia of 900 kgm^2. A child pushes the merrygoround with a constant force of 80 N applied at the edge and parallel to the edge. A frictional torque of 12 Nm acts … 
Physics
A merrygoround is at rest before a child pushes it so that it rotates with a constant angular acceleration for 38.0 s. When the child stops pushing, the merrygoround is rotating at 1.20 rad/s. How many revolutions did the child … 
physics
A merrygoround in the park has a radius of 1.8 m and a rotational inertia of 900kgm^2. A child pushes the merrygoround with a constant force of 80 N applied at the edges and parallel to the edge. A frictional torque of 12 Nm acts … 
physics
6.A child pushes a merry goround from rest to a final angular speed of 0.46 rev/s with constant angular acceleration. In doing so, the child pushes the merrygoround 1.3 revolutions. What is the angular acceleration of the merry … 
Physics
A merrygoround with r = 4m and a perfect frictionless bearing is pushed with a force of 24 N by a young girl. She pushes with a constant force that is oriented tangentially to the edge of the merrygoround. After she pushes the … 
PHYSICS
A child pushes a merrygoround with a force of 55.0 N at an angle tangent to the circle (that is, perpendicular to a radius). If the child pushes it through exactly one full circle, and the merrygoround has a radius of 1.15 m, how … 
physics
A child pushes a merrygoround with a force of 80.0 N at an angle tangent to the circle (that is, perpendicular to a radius). If the child pushes it through exactly one full circle, and the merrygoround has a radius of 1.15 m, how …