A 0.75kg key is attached to the end of a 0.25m lanyard. The key is swung in a horizontal circle and has an acceleration of 2.5m/s/s. a. Calculate the velocity of the key b. Calculate the centripetal force acting on the key

The amount of potential energy possessed by an elevated object is equal to

Adiagram show how a converging lens can produce a real image and virtual image

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.)