True or false: Black holes are invisible because they do not reflect light? A. true B. false

Why would the velocity of a mechanical wave change as it passes through each of the three states of matter (solids, liquids, and gasses) ?

If a battery is running down, a light bulb in the circuit will become dimmer because when voltage drops a. there's less current flowing through the bulb. b. the resistance in the circuit increases proportionally. c.

Which of the following statements are true? Check all that apply. O A positive charge and a negative charge attract each other. O Electric charge is conserved. O Two positive charges attract each other. O A neutral object contains no charge.

How long does it take to travel to Mercury while going 100,000 km per hour?

Which vocabulary term is survival of the fittest

Explain why models are often used to study other planets.

The main factors that affect an area's temperature are prevailing winds and mountains. a. True b. False

What is the displacement of an object during a specific unit of time?

Is there an end of rainbow

A downhill skier was able to move 560 meters in 25 seconds. What is the skier's average speed? (Round your answer to the nearest tenth of a meter per second.)