A dam produces 400 watts of electrical energy. What is the efficiency of the dam?

Astronomers are getting information about dark energy from a the existence of dark matter b the number of stars in the sky c the fact that gases are in galaxies d the shape of galaxies in cluster galaxies

Forces always act in pairs. True False

Imagine you were the director of the Bacteria Institute. What could be the purpose of your organization and what would the people working at your organization do?

A sonar pulse is sent to the ocean bottom at 25°C, and it takes 1.20 s for the echo to come back. How deep is the bottom? 0.90 km 0.92 km 1.79 km 1.84 km

A plane is flying due east in still air at 395 km/h. suddenly, the plane is hit by wind blowing at 55km/h toward the west. what is the resultant velocity of the plane

Which is an example of transfroming potential energy to kinetic

Place the ball in the plastic bag, and twist the top so the ball is secure in the bag. Wrap the twisted portion with tape so it stays tight. Use the hole punch or scissors to poke a hole in the part of the bag that's above the ball.

Choose The units of 1/4πε0 are: A. N2C2 B. N • m/C C. N2 • m2/C2 D. N • m2/C2 E. m2/C2

What does a fern ultimately depend on as an energy source?

According to the Doppler Effect, which statement is true about a sound as it approaches you and then moves away. A) As the source approaches you, the sound waves are compressed so the pitch of the noise increases.