If the work put into a lever is 25.0 joules and the work done by the lever is 20.0 joules, what is the efficiency of the lever?

A balloon is rubbed against a student's hair and then touched to a wall. The balloon "sticks" to the wall due to

What is the formula for power

How much work is done when I apply 200 N of force to a brick wall

An ideal solenoid having a coil density of 5000 turns per meter is 10 cm long and carries a current of 4.0 a. what is the strength of the magnetic field at its center?

If a pizza delivery guy declares himself the leader over the other pizza delivery people, he probably won't have many people obey any rules he makes. Why? People are more likely to obey people that are just like themselves.

Which statement describes the formation of a nebula? A. An elliptical flattened disk begins. B. A bulging core with irregular stars around it forms. C. A large flattened core at the center contracts. D. Gases from a dead star gather and contract.

What are 4 things that can happen to a light wave when it hits an object?

Which of the following is NOT a strategy to prevent falls? a. keeping walking surfaces free from moisture and clutter b. replacing damaged electrical cords c. installing handrails for stairs d. keeping a ladder handy for reaching high places

What are a few things that could not be used as evidence?

Examples were friction is not useful