2. (a) A rescue helicopter lifts a 93.5 kg person straight up by means of a cable. The person has an upward acceleration of 0.738 m/s² and is lifted from rest through a distance of 7.97 m. (i) What is the tension in the cable. (ii) How much work is done by the tension in the cable? (iii) How much work is done by the person's weight? (iv) Use the work-energy theorem and find the final speed of the ] person. (b) The diagram shows the first two hills of a frictionless rollercoaster ride, marked A and B. At A the 1100 kg carriage is moving at 0.5 m/s, and at B it is moving at 33 m/s. If B is 35 m high, use conservation of energy to calculate the height of A. 68 A B (c) A 73 kg sprinter, starting from rest, reaches a speed of 7 m/s in 1.8 s. Calculate the average power needed to accelerate the runner?

2. (a) A rescue helicopter lifts a 93.5 kg person straight up by means of a cable. The person has an upward acceleration of 0.738 m/s² and is lifted from rest through a distance of 7.97 m. (i) What is the tension in the cable. (ii) How much work is done by the tension in the cable? (iii) How much work is done by the person's weight? (iv) Use the work-energy theorem and find the final speed of the ] person. (b) The diagram shows the first two hills of a frictionless rollercoaster ride, marked A and B. At A the 1100 kg carriage is moving at 0.5 m/s, and at B it is moving at 33 m/s. If B is 35 m high, use conservation of energy to calculate the height of A. 68 A B (c) A 73 kg sprinter, starting from rest, reaches a speed of 7 m/s in 1.8 s. Calculate the average power needed to accelerate the runner?

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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