A train travels 76 kilometers in 2 hours and then 54 kilometers in 5 hours. What is the average speed?

When Reggie stepped up to the plate and hit a. 15 kg fast ball traveling at 36m/s the impact caused the ball to leave his bat with a velocity of 45m/s in the oppsite direction. If the impact lasted 0.0020s, what force did Reggie exert on the ball

The interaction between two waves that meet is called

A step-up transformer is connected to a generator that is delivering 141 V and 110 A. The ratio of the turns on the secondary to the turns on the primary is 1110 to 5. What voltage is across the secondary

A solar flare is a very high energy event on the surface of the sun. Which wavelength is best to observe such an event? - visible light -microwaves -xray -infrared

Does light have mass?

How does a low pressure system determine the weather in an area?

Molecules at room temperature move freely. What happens to the molecules when heat is removed until it freezes? Molecules group together Molecules slow down and contract Molecules speed up and expand Molecules move freely

A spring is used in a lab. It is vibrated at different frequencies and the wavelength is recorded. Using the graph of the data, what is the relationship found between frequency and wavelength? A) Frequency and wavelength are inversely related.

How do you describe the frequency of waves perceived by the observer from the moment the source appears to the moment it disappears?

What causes the stars to appear to move across the night sky?