When a muscle is stretching by a contraction of the opposing muscle it is called

A car has a momentum of 20,000 kg • m/s. What would the car's momentum be if its velocity doubles?

If the acceleration of a moving object is zero, which of the following best describes its motion? moving up at a constant speed speeding up moving in a circle slowing down

When do you think did the present day humans first appeared on earth?

Compare and contrast the velocity and speed equation

A spring is pulled to 10cm and held in place with a force of 500N. What is the spring constant of the spring

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?