What do we mean when we say the universe is expanding, and how does expansion lead to the idea of the big bang and our current estimate of the age of the universe?

If you push a cork into the neck of a bottle filled with air, what happens to the pressure inside the bottle?

If you were to drop a rock from a tall building, assuming that it had not yet hit the ground, and neglecting air resistance. What is its vertical displacement (in m) after 4 s? (g = 10 m/s2)

If you have a unknown substance with the follow traits, which category of elements would it most likely belong? 1. Brittle 2. Luster 3. Solid at room temperature (STP) options: Metal Metalloid Non-metal There is no way to categorize this substance

A car accelerate from a stop to 27 m/sec in 5 seconds. What was the car's acceleration?

Why were the rings of Uranus not observed directly from telescopes on the ground on Earth? How were they discovered?

In what state do hydrogen and helium exist in a star

13) The frequency of a vibrating string varies inversely as its length. A string 3 feet long vibrates 175 cycles per second. Find the frequency of a 5 foot string.

Match the following. 1. energy a push or a pull 2. mechanical energy energy of a moving object 3. kinetic energy a force directed away from an object 4. heat the ability to do work 5. work a force moving an object through a distance 6.

Scientists hypothesize that oxygen began to accumulate in earth's atmosphere of living things with the ability to?

The 3 stages of the water cycle are