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Module 2

# Module 2 - 35 C r Module 2 Show all work and reasoning in...

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35° r C Module 2 Show all work and reasoning in your solution to each problem for full credit. Problems Chapter 4: 3. Two horizontal forces, F1 and F2 , are acting on a box, but only F1 is shown on the drawing. F2 can point either to the right or to the left. The box moves only along the x axis. There is no friction between the box and the surface. Suppose that =+ . F1 9 0N and the mass of the box is 3.0kg. Find the magnitude and direction of F2 when the acceleration of the box is = =+ . . =+ . / a Fm 9 0N3 0kg 3 0 m s2 a) +5.0 m/ s2 + . + . / =+ . 9 0N 5 0 m s2 1 8kg to t h e rig h t b) -5.0 m/ s2 + . 9 0N - . / = 5 0 m s2 - . 1 8kg to t h e left c) 0 m/ s2 + . / = 9 0N0 m s2 undefined by division by 0 INSTRUCTORS NOTES: # 3: F = ma so, F = ma - F Then, a) F = +6N b) = -24N c) = -9.0N 7. ssm Interactive Learning Ware 4.1 at www.wiley.com/college/cutnell reviews the approach taken in problems such as this one.

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A 1580-kg car is traveling with a speed of 15.0 m/s. What is the magnitude of the horizontal net force that is required to bring the car to a halt in a distance of 50.0 m? , = ; , = / ; , = final speed v 0 initial speed v0 15 m s distance d 50m = + = = 0 152 2a50∶ a - = 152250 - = 225100 - . / 2 25 m s2 - indicating car is slowing down = F 1580kg - . / = 2 25 m s2 3555N required to h alt t h e car 14. When a parachute opens, the air exerts a large drag force on it. This upward force is initially
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