Ahydraulic jack is used to lift a car in order to change a tire. the car exerts a force of 9,800 n toward the ground due to the force of gravity. to begin to lift the car, a hydraulic jack must produce of force. to keep the car in position once it is lifted, the jack must produce of force.

To begin to lift the car, a hydraulic jack must produce more than 9,800N of force.

To keep the car in position once it is lifted, the jack must produce exactly 9,800N of force.

this is poiselle's equation from fluid mechanic in physics. mech eng

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.