Does observing a physical property of a substance change the identity of the substance

What would happen if a major predator was added to the food web? A. The population of prey would stay the same. B. The population of prey would decrease. C. The population of prey would fluctuate. D. The population of prey would increase

The whistle on a train produces a sound wave with a particular pitch. Which of the following best describes the whistle sound that a person perceives while the train approaches him or her? A. A higher pitch, then a lower pitch B. The same pitch C.

Use your knowledge of the state of matter and the other physical properties of matter to write an explanation for what may have caused the following situation: Although it hasn't rained in a week, every morning the grass and the car windows are wet.

A 1.2-kg object moving with a speed of 8.0 m/s collides perpendicularly with a wall and emerges with a speed of 6.0 m/s in the opposite direction. if the object is in contact with the wall for 2.

Justify why a rotten fruit is not truly wasted

Dark matter has been detected by its

The catcher catches a. 5 kg baseball traveling at 40 m/s and the glove is pushed back 10 cm. What average force did the catcher put on the ball?

Describe the climate and name the climate zone at alaska; portland, oregon; and key west, florida.

If a river is 20 feet wide in nature and needs to be scaled to one-tenth its real size, how wide should it be in a model?

A sample has a density of 30 g/ml. there is 60 ml of this substance. how much does it weigh?