URGENT A boy can swim at a maximum velocity of 2.4 m/s. If he swims north as fast as he can across a river that flows east at 3.8 m/s, what will be his resultant velocity? Give a complete answer!

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What is the earliest point in the universe that we can observe? why can’t we see back further than this?

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

When a spring is compressed, the energy changes from kinetic to potential. which best describes what is causing this change? work power gravitational energy chemical energy