If we see a supernova of a star that is 25 light years away from us, we know it exploded 25 years ago.

True

False

Two cars are facing each other from opposite ends of a 500m long road. Car A begins travelling at a constant speed of 20m/s. At the same moment, Car B begins travelling toward Car A at a constant speed of 16m/s.

The main greenhouse gases in the atmospheres of the terrestrial planets are

2. What are the significants of determination of light

What vocabulary word is "wetness in the atmosphere"?

As the caterpillar climbs, its potential energy is increasing. what source of energy has been used to effect this change in potential energy?

When a 3.50-g sample of liquid octane (c8h18) is burned in a bomb calorimeter, the temperature of the calorimeter rises by 27.3 ∘c. the heat capacity of the calorimeter, measured in a separate experiment, is 6.22 kj/∘c?

Air has pressure because a. the stratosphere is thick b. air has mass c. wind moves the air d. temperature warms the air

What types of exercises for stomach

Which states the law of conservation of energy? A. Energy cannot be created or destroyed, but it can be converted or changed into different forms. B. Energy can be created or destroyed, and it can be converted or changed into different forms. C.

What is density? How can you find density?