Chapters 1-3 Review. 1-Physical Quantities,Vectors 2-Motion in 1-D 3-Motion in 2 and 3-D. 9/29/2014 Physics 218

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1 Chapters 1-3 Review 1-Physical Quantities,Vectors 2-Motion in 1-D 3-Motion in 2 and 3-D 9/29/2014 Physics 218 1

2 Exam 1 information Exam 1 will be held Wednesday, 10/1 at 7:30 pm in HECC 108. The exam is design to take one hour and you will be given 75 minutes to complete your work. The Exam will cover material in chapters 1-3. Some practice exam problems are available on the class web site. You will not need a scantron. The exam book and formula sheet will be provided to you. You will need your TAMU ID and remember your section number and lecturers name. You will be allowed to use a calculator (simple), but if you have a programmable calculator, you must have cleared its memory BEFORE coming to the exam. Cell phones should be turned off and stored for the exam period. Any use of cell phones during the exam is prohibited and if used will be considered an Honor Code violation. 9/29/2014 Physics 218 2

3 Chapter 1, summary 9/29/2014 Physics 218 3

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5 Chapter 1 Find the net displacement of the postal truck for this journey. 9/29/2014 Physics 218 5

6 Using components, find A+B and A-B. 9/29/2014 Physics 218 6

7 Chapter 2, summary 9/29/2014 Physics 218 7

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10 Chapter 2 A physics professor leaves her house and walks along the sidewalk to campus. After 5 minutes it starts to rain and she returns home. At which points is her velocity (a) zero? (b) Constant and positive? (c) Constant and negative? (d) Increasing in magnitude? (e) Decreasing in magnitude? 9/29/2014 Physics

A passenger train traveling at 25.0 m/s Sights a freight train 200 m ahead on the Same track. The freight train is traveling at 15.0 m/s in the same direction as the passenger train.

11 A passenger train traveling at 25.0 m/s Sights a freight train 200 m ahead on the Same track. The freight train is traveling at 15.0 m/s in the same direction as the passenger train. If the engineer of the passenger train applies the brakes creating an acceleration of m/s 2 in the direction opposite the train s velocity at this point. Will there be a collision and if so where will it take place? 9/29/2014 Physics

12 Chapter 3, summary 9/29/2014 Physics

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15 Chapter 3 An object is launched from a cliff at an angle of 50 o. Use the information given in the figure to find the following: a) The initial speed of the object. b) The height of the cliff. 9/29/2014 Physics

16 An airplane pilot sets a compass course due west and maintains an airspeed of 219km/h. After flying for a time of 0.510h, she finds herself over a town a distance 121km west and a distance 22km south of her starting point. a)find the magnitude of the wind velocity. b)find the direction of the wind velocity. Express your answer as an angle measured south of west. c)if the wind velocity is 36km/h due south, in what direction should the pilot set her course to travel due west? Use the same airspeed of 219km/h. 9/29/2014 Physics

17 1) An air-traffic controller observes two planes on the radar directly east of the airport. One is at a radial distance d 1 and angle θ 1 above the horizontal, the other is at a distance d 2 and angle θ 2. What is the distance between the two planes? (Given d 1, d 2, θ 1, and θ 2 find the distance d 12 between the planes.) T. Stiegler 09/24/2013

18 2) A basketball player releases the ball from a height h 1 at an angle θ and initial velocity v 0 in an attempt to put the ball into the basket which is at height h 2 and a horizontal distance d. Calculate the distance d if the ball is to make it into the basket. (given h 1, h 2, θ, and v 0 find d) d h h 1 2 T. Stiegler 09/24/2013

3) A coyote wearing an ACME rocket pack is traveling along a road at a constant velocity v 0 and

The road runner is standing still but spots the coyote at t = 0 and races with constant

Find the velocity v 0 such that the coyote just manages to catch the road runner at the entrance

19 3) A coyote wearing an ACME rocket pack is traveling along a road at a constant velocity v 0 and spots a road runner directly ahead at a distance d 0. The road runner is standing still but spots the coyote at t = 0 and races with constant acceleration a toward a cave opening which is at a distance d c from the road runner. Find the velocity v 0 such that the coyote just manages to catch the road runner at the entrance to the cave. (given d 0, d c, and a find v 0 so that the poor hungry coyote gets to have roast road runner for dinner.) d 0 d c v 0 a T. Stiegler 09/24/2013

20 4) A carnival ride is a large cylinder that rotates along its axis with a frequency f revolutions per second. People are supposed to stand along the wall of the cylinder at radius R and feel an acceleration 5g when the cylinder is rotating. Find the radius R such that this is the case. T. Stiegler 09/24/2013

21 5) A ball is dropped (from rest) from a window at height h and is seen to reach the ground in a certain time. The ball-dropper then climbs to a height 2h but wants the ball to reach the ground in the original time. Find the velocity v 0 that must be given to this ball to achieve the goal. T. Stiegler 09/24/2013

22 6) A cannon ball is fired with a velocity v 0 at an angle α from a height y 0 = 0 from position x 0 = 0. It strikes a cliff a distance D away at a height H. What is the value of the height H in terms of the other given variables. V 0, α H T. Stiegler 09/24/2013 D

1) If the acceleration of an object is negative, the object must be slowing down. A) True B) False Answer: B Var: 1

University Physics, 13e (Young/Freedman) Chapter 2 Motion Along a Straight Line 2.1 Conceptual Questions 1) If the acceleration of an object is negative, the object must be slowing down. A) True B) False