Which is an example of a scientist using a mathematical model to describe the weather? A. The scientist finds an equation that predicts how long a rainstorm will last.

B. The scientist says that a lightning bolt is like a long snake.

C. The scientist uses cotton balls to represent clouds, and grass to represent the ground.

D. The scientist thinks of a cloud as a giant ball of cotton candy.

(its A)

Anonzero net force acts on a particle and does work. which one of the following statements is true? the kinetic energy of the particle changes, but the speed of the particle does not change. the kinetic energy of the particle does not change, but the speed of the particle does change. the kinetic energy of the particle changes, but the velocity of the particle does not change. the kinetic energy and the speed of the particle change, but the velocity of the particle does not change. the kinetic energy, speed, and velocity of the particle change.