Which factors improve soil fertility? Select the three correct answers.

A. Artificial fertilizer

B. High pH

C. Water

D. Bedrock

E. Nitrogen-fixing bacteria

The greater the force exerted by tue engine of a car over a set distance, the greater the change in

A prediction A. is not a strategy used in a scientific investigation. B. is the final step in a scientific investigation. C. is an optional step in a scientific investigation. D. is a necessary step in a scientific investigation.

In order to increase the amount of work completed it is necessary to

A greyhound's velocity changes from rest to 19 m/s in 2 seconds. What is the greyhound's average acceleration? a) 2 m/s2 b) 9.5 m/s2 c) 19 m/s d) 38 m/s

The farther the object is stretched or compressed, the greater its potential energy. True False

In a laser, electrical energy is changed to light energy, and a small amount of the energy is wasted as heat. Describe the total amount of the heat in the system (using the conservation of energy).

What is the name for a star and planets held together by gravity? A. solar system B. galaxy C. black hole D. supernova

When a car turns a corner on a level road, which force provides the necessary centripetal acceleration? 1) gravity 2) normal force 3) air resistance 4) tension 5) friction

Use Newton's universal law of gravitation to explain why gravity is greater on Earth than on Mercury.

What is a magnetic field and how does it interact with magnetic materials?