What three things happen when air is warmed?

a) it expands

b) it contracts

c) it becomes lighter

d) it becomes heavier

e) it rises

f) it sinks

The distance a softball is pitching from mound to the batter is

Do radio waves travel at the speed of sound

An object of mass m1 = 19 kg and velocity v1 = 1.5 m/s crashes into another object of mass m2 = 8 kg and velocity v2 = - 13.5 m/s. The two particles stick together as a result of the collision.

Which is a "big idea" for space and time? Energy can be transferred but not destroyed. The universe consists of matter. Forces describe the motion of the universe. The universe is very big and very old.

Which of the following could be described as "Energy cannot be created or destroyed, only converted into other forms"? A. Rebound-crumple theorem B. Impulse-momentum theorem C. Law of conservation of energy D. Law of conservation of momentum

Waves on a pond are an example of which kind of wave? a. sound b. surface c. deep water d. non-mechanical

What does a velocity vs time graph look like for constant velocity if the speed is 2m/s. And the time is not given.

An electron and a proton, starting from rest, are accelerated through an electric potential difference of the same magnitude. in the process, the electron acquires a speed ve, while the proton acquires a speed vp. find the ratio ve/vp.

Why water is matter? what is the reason

Restate newton's first law in terms of acceleratin