Ascrew jack who's pitch is 2mm ,is used to raise a block of 700kg through a height of 30cm. the length of a tommy bar of the jar is 50cm. if the jack is 70% effecient calculate: velocity ratio, mechanical advantage, effort required, and workdone by the effort

You are traveling in a car going at a constant speed of 100km/h down a long, straight highway. you pass another car going in the same direction which is traveling at a constant speed of 80km/h. as measured from your car's reference frame this other car is traveling at −20km/h. what is the acceleration of your car as measured from the other car's reference frame? what is the acceleration of the other car as measured from your car's reference frame?

Waves are used in many practical applications to support work, entertainment, and health. one example is the use of ultrasound imaging to safely track the development of a growing fetus. what is a specific example of a practical application of waves in medicine, entertainment, safety, or other fields? provide a brief explanation of how the properties of waves are useful to that application.

What is the rate of 12 liters of water moving through a water hose in 4.0 minutes?