how much heat is required to raise the temperature 500 of song of iron from 50°to 250°c? (take c=480j/kg°c)

Imagine that someone pushes one marble toward a motionless marble. would there still be action-reaction forces involved in the collision? how might the marbles’ motions be changed? ?

Discuss how the hardness or softness of the landing surface is related to the time required to stop the egg

Suppose that 27 j of work is needed to stretch a spring from its natural length of 6 m to a length of 9 m. (a) how much work is needed to stretch the spring from 12 m to 14 m? j (b) how far beyond its natural length will a force of 78 n keep the spring stretched?