The 0.75-kg bob of a pendulum is fired from rest at position a. if the spring is compressed 50 mm and released, determine (a) its stiffness k so that the speed of the bob is zero when it reaches point b, (b) the stiffness k so that when the bob reaches point c the tension in the cord is zero

Match each type of lever with the correct diagram. 1. first-class 2. third-class 3. second-class

Which of hubble’s discovery support the big bang theory

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.)