4. A rock of mass 4.0 x 102 g is tied to one end of a string that is 2.0 m in length. Holding the other end above his head, a boy swings the rock around in a circle whose plane is parallel to the ground. Draw a free body diagram andſexplain your steps in detail, neatly. a. If the string can withstand a maximum tension of 4.5 N before breaking, what angle to the vertical does the string reach just before breaking? b. At what speed is the rock travelling just as the string breaks?

4. A rock of mass 4.0 x 102 g is tied to one end of a string that is 2.0 m in length. Holding the other end above his head, a boy swings the rock around in a circle whose plane is parallel to the ground. Draw a free body diagram andſexplain your steps in detail, neatly. a. If the string can withstand a maximum tension of 4.5 N before breaking, what angle to the vertical does the string reach just before breaking? b. At what speed is the rock travelling just as the string breaks?

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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1. A racing bicycle with rider has a combined mass of 85 kg. The racer is on a velodrome (circular racing track) that has banked curves. The surface is banked at an angle of 35° from horizontal. The track has a radius of 60 m. a) Draw a free-body diagram of the racer viewing the racecar from the front (left) and from above (right.) Ignore friction. Indicate the direction of the acceleration of the racer next to your diagram. b) Based on your free-body diagram do you think the car could possibly stay on a circular path (the track) without friction? Explain. c) Which of the forces you drew has a component in the same direction as the acceleration? Explain. d) Write down your force equations and solve for the acceleration of the racer moving at a constant speed around the track with no friction. (Hint: Use the direction of the acceleration as one of your axes. Do not use along-the-incline and perpendicular-to- the-incline as your axes.) e) What speed would the racer have with this…
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A car with a mass of 922 kg rounds the top of the hill at a speed of 10 m/s. The friction between the wheels and the road is negligible and the radius of curvature for the hill is 32 m. A. Draw the force diagram and write down a Newton’s 2nd law equation for the car when it is at the top of the hill. B. Find the magnitude of the normal force on the car when it rounds the hill at this speed. C. What is the maximum speed at which the car could round this hill without losing contact with the road?