A 25 kg child on a swing 2 m long is released from rest when the swing supports make an angle of 30° with the vertical.
a. Neglecting friction, find the child's speed at the lowest
position

How much energy will be transferred to your eardrum while listening to this sound for 1.0 min?

The flow of electrons from one atom to another is called

You are your friend move a new refrigerator into his kitchen. you apply a horizontal force of 252 n in the negative x direction to try and move the 56 kg refrigerator. the coefficient of static friction is 0.61. (a) how much static frictional force does the floor exert on the refrigerator? give both magnitude (in n) and direction. magnitude n direction (b) what maximum force (in n) do you need to apply before the refrigerator starts to move?