What are the two main categories of body membranes

What is the process in which a star is born?

During an experiment, a toy car accelerates forward for a total time of 5s. Which procedures could a student use to determine the average net force exerted on the car during the 5s that the car accelerates?

Which planets are composed more of gas than liquids and solids?

How can you tell if a mountain valley was formed by a stream or glacier.

What are mixtures? click that apply

Is there such a thing as real time weather radar? why not?

Luke and Carrie are driving down a straight section of the interstate at 70 mph in Luke's new convertible. Carrie is drinking a soda in the passenger seat.

A force produces power p by doing work w in a time t. what power will be produced by a force that does six times as much work in half as much time?

A batter hits a baseball with a bat. The bat exerts a force on the ball. Does the ball exert a force on the bat?

In a nuclear power plant, the temperature of the water in the reactor is above 100°C because of what?