Melting wax evaporating gasoline freezing water these changes are all examples of a) nuclear changes. b) physical changes. c) chemical changes. d) energy consumption.

Astudent pushes on a 20.0 kg box with a force of 50 n at an angle of 30° below the horizontal. the box accelerates at a rate of 0.5 m/s2 across a horizontal floor. what is the value of the normal force on the box? 200 n 243 n 156 n 225 n

Arowboat passenger uses an oar to push the boat off the dock by exerting a force of 40n for 3.0s. what impulse acts on the boat.

The law of the conservation of momentum says that the total momentum of any closed and isolated system cannot