suppose you are on a cart, initially at rest, which rides on a frictionless horizontal track. if you throw a ball off the cart towards the left, will the cart be put into motion?

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

In what direction does the medium move relative to the direction of the wave? explain.

A248-g piece of copper is dropped into 390 ml of water at 22.6 °c. the final temperature of the water was measured as 39.9 °c. calculate the initial temperature of the piece of copper. assume that all heat transfer occurs between the copper and the water. remember, the density of water is 1.0 g/m