Question 1A

Item 1 Review | Constants Part A Two tugboats pull a disabled supertanker. Each tug exerts a constant force of 1.70*106 N , one at an angle 17.0 west of north, and the other at an What is the total work done by the two tugboats on the supertanker? angle 17.0 " east of north, as they pull the tanker a Express your answer in joules, to three significant figures. distance 0.860 km toward the north. > View Available Hint(s) VO ? SubmitItem 2 Review | Constants Part A Object A has 25 J of kinetic energy. Object B has one-quarter the mass of object A. If object B also has 25 J of kinetic energy, is it moving faster or slower than object A? O faster slower Submit Request AnswerPart B Find the ratio of the speeds of objects A and B. Express your answer to two significant figures. VO AEd UA UB Submit Request AnswerPart C By what factor does the speed of each object change if total work -20 J is done on each? Express your answer to two significant figures. VO AEd Ufinal Vinitial Submit Request AnswerItem 6 Review | Constants Part A Consider the system shown below (Figure 1). The rope and pulley have negligible mass, and the pulley is frictionless. Initially the 6.00 kg block is moving Use the work-energy theorem to calculate the coefficient of kinetic friction between the 8.00 kg downward and the 8.00 kg block is moving to the right, block and the tabletop both with a speed of 0.700 m/s. The blocks come to Express your answer using four significant figures. rest after moving 4.50 m. AEd Figure VO 6.00 kgItem 9 Review | Constants Part A A baseball is thrown straight up. The drag force is proportional to v2. The positive y direction is upward. In terms of g, what is the y-component of the ball's acceleration when its speed is half its terminal speed value and it is moving up? Express your answer as a multiple of acceleration due to gravity. > View Available Hint(s) V ? ay g SubmitPart B In terms of g, what is the y-component of the ball's acceleration when its speed is half its terminal speed and it is moving back down? Express your answer as a multiple of acceleration due to gravity. View Available Hint(s) AEd On = g SubmitItem 10 Review | Constants Part A A skydiver of mass 80.0 kg (including parachute) jumps off a plane and begins her descent. At the beginning of her fall, does the skydiver have an acceleration? Throughout this problem use 9.80 m/s for the free-fall acceleration. View Available Hint(s) O No; the skydiver falls at a constant speed. O Yes and her acceleration is directed upward. O Yes and her acceleration is directed downward. SubmitPart B At some point during her free fall, the skydiver reaches her terminal speed. What is the magnitude of the drag force Farag due to air resistance that acts on the skydiver when she has reached terminal speed? Express your answer in newtons. View Available Hint(s) VO AEd + Farag = N SubmitPart C For an object falling through air at a high speed v, the drag force acting on it due to air resistance can be expressed as F =Kv2 where the coefficient K