The speed of sound in air is about 340 meters per second. How long does it take a sound wave to travel a distance of 7800 meters

Edwin Hubble calculated the expansion rate of the universe. On what evidence did he base his calculation? /l "/l " A. Levels of background radiation /l "/l " B. Differences in redshift for galaxies /l "/l " C.

A ball is dropped from a height of 20m and renounce with the velocity which is 3/4 of d velocity with which it hits the ground. What is d tym interval btw the first and second bounces

A kangaroo jumps to a vertical height of 2.3 m. how long was it in the air before returning to earth?

What weather could create the best surfing waves? A. Weak winds that blow for short periods of time with a short fetch. B. Strong winds that blow for short periods of time with a short fetch. C.

You are about to attack a troll in a role-playing game. You will throw w with the letters A through F. In order to bear you will beat the troll? ning game. You will throw two dice, one numbered one to eight and the other gh F.

How do whales bats and dolphins use echolocation? A To scare away predators B To attract mates C To orient them selves and find food D To tell animals of there species where they are

How much force would be needed to move a car with the mass of 100kg to an acceleration of 5m/s/s?

A pendulum bob is made from a sphere filled with water. What would happen to the frequency of vibration of this pendulum if the sphere had a hole in it that allowed the water to leak out slowly?

Elias serves a volleyball at a velocity of 16 m/s. The mass of the volleyball is 0.27 kg. What is the height of the volleyball above the gym floor when its total mechanical energy is 41.70 J? Round to the nearest number.

Which of the following is the best description of a graph? A. Equations that can be plotted B. A representation of an equation C. Independent and dependent variables D. x and y lines