Which of the following systems is not true about machines?

Calculate the kinetic energy of a car that travels at a speed of 20 m/s and has a mass of 1200 Kg

A negatively charged iron ball on the end of a plastic rod exerts a strong attractive force on a penny even though the penny is neutral. how is this possible?

A joule which is a unit of work is equal to what? a. newton/meter b. newton/second c. newtonxsecond d. newtonxmeter

Part A A battery powers a circuit for a small noisy fan. The fan's motor gets warm as it turns. What energy transformations are taking place?

Is darkness matter?

Children in a tree house lift a small dog in a basket 4.00 m up to their house. If it takes 187 J of work to do this, what is the combined mass of the dog and basket?

What happens to the speed of the particles if the temperature is increased

A 65-year-old male enters the hospital with high blood pressure, damaged lungs, low blood-oxygen concentration, and throat cancer. What are all of these symptoms associated with?

At a certain factory, 340 kg crates are dropped vertically from a packing machine onto a conveyor belt moving at 1.00 m/s. (A motor maintains the belt's constant speed.) The coefficient of kinetic friction between belt and crate is 0.400.

A hydraulic lift is used to lift a heavy box that is pushing down on a 1.5-m2 piston with a force of 1,700 N. What force needs to be exerted on a 0.12-m2 piston to lift the box?