Which of these is a source for particulate matter in the air?

a. automobiles

b. dust

c. fires

d. all of the above

What causes light waves to refract? A) The speed of light is reduced to zero. B) The speed of light remains constant. C) The light is repelled by some materials. D) The speed of light changes from one medium to the next.

Which object carries the greatest amount of kinetic energy?

Box 1 and box 2 are whirling around a shaft with a constant angular velocity of magnitude ω. Box 1 is at a distance d from the central axis, and box 2 is at a distance 2d from the axis.

Calculate the average speed of a car of it traveled 180km in 2.0hr

Blank have a definite shape and do not easily take the shape of their container

The Sun transfers light energy that is transformed into what kind of energy in plants?

The siren of a fire engine that is driving northward at 30.0 m/s emits a sound of frequency 2000 Hz. A truck in front of this fire engine is moving northward at 20.0 m/s.

If an atom has 34 protons and 40 neutrons, what is the mass number?

The atomic mass of an atom (in amu) is equal to Question 11 options: A. the total number of its protons, neutrons, and electrons B. the total number of electrons C. the total number of protons D. the total number of its protons and neutrons E.

12. Which of these describes the gravitational force from a planet?" O large and pulls objects toward itself small and pulls objects toward itself O small and pushes objects away from itself O large and pushes objects away from itself