What percentage of energy is available to organisms at each level of an energy pyramid?

An Earth satellite is in a circular orbit at an altitude of 500 km. Explain why the work done by the gravitational force acting on the satellite is zero. Using the work-energy theorem, what can you say about the speed of the satellite?

A period of precipitation is one of the short-term conditions in the atmosphere referred to as weather. (i) Identify the layer of Earth's atmosphere where the circulation and mixing of liquids and gases produce weather.

Increase of green house gases, due to human activity, is warming the oceans. This causes changes in climate. Name three Earth spheres which interact in this process. Justify your answer.

Which is closer to the Sun-Mercury or the Earth? A. They are the same distance from the Sun. B. The Earth is closer to the Sun than Mercury is. C. Mercury is closer to the Sun than the Earth is. D.

A technician is troubleshooting a problem. The technician tests the theory and determines the theory is confirmed. Which of the following should be the technician's NEXT step? A. Implement the solution. B. Document lessons learned. C.

Which is a branch of Earth science? physics ecology chemistry geology

A 6,600 kg train car moving at + 2.0 m/s bumps into and locks together with one of mass 5,400 kg moving at - 3.0 m/s. What is their final velocity? A.) - 1.0 m/s B.) + 2.5 m/s C.) - 0.25 m/s D.) + 0.50 m/s

Why does matter absorb sound energy?

What is the speed of a wave if the wave length is 100 m and the period is 20 s? A. 80 m/s B. 120 m/s C. 2,000 m/s D. 5 m/s

Which best explains why magnets can push on or pull other magnets without touching them? North poles always attract each other, and south poles always force each other away.