Which best describes most covalent compounds? resilient brittle cold warm

Alfred pushes on a heavy box, but cannot move it. the box has a lot of inertia motion friction gravity

A2000 kg car is rounding a curve of radius 200 m on a level road. the maximum frictional force the road can exert on the tires of the car is 4000 n. what is the highest speed at which the car can round the curve?

Give an example in which the electrical energy changes to light energy