Ellen needs to move a heavy box across the floor and then place it on a shelf that is four feet above the floor. which use of machines would most likely require the least amount of force in order to get the box on the shelf? a. sliding the box up an inclined plane to the shelf b. rolling the box up an inclined plane on a cart c. sliding the box across the floor and then lifting it using a pulley d. rolling the box across the floor in a cart and then using a pulley

Lightning is an example of what phenomenon? a release of a large amount of energy an absorption of a large amount of energy a natural electric circuit a natural electric current

The flow of electrons from one atom to another is called

The cheetah is considered the fastest running animal in the world. cheetahs can accelerate to a speed of 20.1 m/s in 2.50 s and can continue to accelerate to reach a top speed of 28.1 m/s. assume the acceleration is constant until the top speed is reached and is zero thereafter.1) starting from a crouched position, how long does it take a cheetah to reach its top speed? (express your answer to three significant figures.) s2) how far does it travel in that time? (express your answer to three significant figures.) m3) if a cheetah sees a rabbit 120 m away, how long will it take to reach the rabbit, assuming the rabbit does not move? (express your answer to three significant figures.)