270kg load is lifted 21.0m vertically with an acceleration a=0.170g by a single cable. A. Determine the tension in the cable B. Determine the net work done on the load C. Determine the work done by the cable in the load D. Determine the work done by gravity on the load E. Determine the final speed of the load assuming it started from rest

2. Page 2 > of 7 F=40 30 In this problem, the block moves in the horizontal direction only. A. Find the work done if the force is applied for a distance of d = 2 m. B. If the mass is m= 6 kg and the initial velocity is V- 0. Use the work-energy theorem to find the final velocity C. If the process in part (B) took a time of t = 0.8s, use your answer from part (B) to Calculate the acceleration of the block. D. Now use Newton's second law ( in the x-direction) to calculate the acceleration. Your answers from Part ( C) and ( D) should be pretty close. They're different Because of rounding errors. dy

QUESTION 8 Consider the four possible paths of a body moving through gravity as diagrammed below. Which of the following statements is true? Projectile A a. The work done by gravity is greatest for path B. b. The work done by gravity is greatest for path C. c. The work done by gravity is greatest for path D. d. The work done by gravity is the same for all four paths. e. The work done by gravity is greatest for path A.

3 A child of mass 20 kg on a swing hanging from a 3.0m chain is pulled by her uncle until the swing is at an angle of 30 degrees to the vertical. a) How much farther from the ground is the child now, compared to when the swing was hanging straight down? b) Since the child is motionless at he beginning and the end of the process, what can you say about the work done by gravity, and the work done by the puller on the child during the pullback? What is the amount of work her uncle does to pull back the swing? c) If he lets the swing go at this point, what is the child's speed as she passes the lowest point of the swing & the chain is vertical? Ignore the mass of the swing seat & chain.