What is the relationship between lightning and thunder

How can two machines appear identical and yet not have the same actual mechanical advantage

What is it called when sediment is dropped and comes to rest?

A box of mass 12 kg is at rest on a flat floor. The coefficient of static friction between the box and floor is 0.42. What is the minimum force needed to set the box in motion across the floor?

Is Energy of motion kinetic energy potential energy both

Is the air a good conductor or electricity or a good insulator?

My Notes A basketball rolls across a classroom floor without slipping, with its center of mass moving at a certain speed. A block of ice of the same mass is set sliding across the floor with the same speed along a parallel line.

How does sound travel through waves?

Solve for real t: - 25=20t-5t^2

Contrast balanced and unbalanced forces.

A wave will travel only as long as it has energy