The speed of light is 3.0 x 10 to the power of 8 m/s. The Andromeda Galaxy is approximately 2.4 x 10 to the power if 19 km away from the Milky Way Galaxy. How long does it take light to travel from Andromeda to the Milky Way?

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

A100 kg running back runs at 5m/s into a stationary linebacker. it takes 0.5 for the running back to be completely stopped

What is the coefficient of kinetic friction μk between the block and the tabletop?