Astronomers who discovered quasars found that they show of their spectral lines and are thus probably much than nearby galaxies.

Which surface feature of the moon is characterized by mountainous areas? terrae craters maria regolith

Identical marbles are released from the same height on each of the following four frictionless ramps . compare the speed of the marbles at the end of each ramp. explain your reasoning

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