Phosphorus is:

found free in the atmosphere

returned to the soil by rhizobium

added to the soil through weathering

usually very abundant in an ecosystem

Which best states the author's argument in catching sun rays? no power source is clean, free, and renewable. it costs too much to use solar energy for power. the use of solar energy can cause blackouts in big cities.

What sort of a noise filter you need to use to suppress the noise from mains electricity in your speakers? Explain.

A teacher pushed a 10kg desk across a floor for a distance of 5m. she exerted a horizontal force of 20n. how much work was done?

Find the magnitude of the force that the elbow joint exerts on the forearm.

The half-life of Uranium is longer on Earth than the half-life of Uranium on the moon. True or False?

a submarine moving directly upward in the water at constant speed. The weight of the summer and it is 500,000 N. The submarines motors are off. The magnitude of the buoyant force acting on the submarine is

If the car went 30 km west in 25 min. and then 40 km east in 35 min., what would be its total displacement?

Which of the following is not the name of a space station that was in orbit around Earth?

Relationship between acceleration and free fall

A SI unit used to measure force, equal to less than one-quarter of a pound, is the what