Thinking Like an Engineer: An Active Learning Approach (3rd Edition)
Thinking Like an Engineer: An Active Learning Approach (3rd Edition)
3rd Edition
ISBN: 9780133593211
Author: Elizabeth A. Stephan, David R. Bowman, William J. Park, Benjamin L. Sill, Matthew W. Ohland
Publisher: PEARSON
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Chapter 6, Problem 3RQ
  1. 3. Your college quadrangle is 85 meters long and 66 meters wide. When you are late for class, you can walk (well, run) at 7 miles per hour. You are at one corner of the quad, and your class is at the directly opposite corner. How much time can you save by cutting across the quad rather than walking around the edge?
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ACTIVITY 2 (LECTURE) SCI 2 PHYSICS FOR ENGINEERS I. Answer the following and write your answers on a piece of paper. Upload your work in pdf or jpeg file (portrait). Express your final answers in two decimal places. 1. A turtle is crawling along a straight line. Its distance from the origin at any instant is given by the equation x = 8t – 3t², where x is in centimeters and t is in seconds. Find (a) the average velocity of the body in the interval from t = Os to t = 1s (1pt) and (b) the instantaneous velocity at t = 2.5s. (1pt) 2. A cheetah is chasing a deer at velocity v = 1.8 t³ – 12t where in v is in meters and t is in seconds. Find (a) the average acceleration at time interval of 3.5s and 4.5s (2pts) and (b) the instantaneous acceleration at t = 1.5s.(2pts) 3. An antelope moving with constant acceleration covers the distance between two points 50m apart in 5 seconds. Its velocity as it passes the second point is 15 m/s. What is the antelope's acceleration? (2pts) 4. A ball is…
4. Jack, an engineering student, is taking in the great view while he was on the ship's deck, but as he is enjoying the cold wind tickling his face, he noticed that there is an iceberg about to hit the ship, but instead of reporting it, his curiosity took the best out of him, he hurriedly went to his backpack and took his notebook and pen out. He wondered how big the iceberg is underneath and how much of it is above the seawater. By observing, he calculated that the density of the ice is pice = 2013 Ibm/m² and floats in seawater, and by analyzing the saltiness of the water that hits his face he learned that the density of the seawater is psw = 1213 kg/m?. (2.25lbm = 1.20kg) a. What fraction of the iceberg is beneath the surface of the water? b. What fraction of the iceberg is above the surface of the water? c. Should Jack ask for Rose's help in the upcoming midterm exam?
Recall the discussion on spacecraft from the chapter opener. The following problems consider a rocket launch from Earth’s surface. The force of gravity on the rocket is given by F(d)=−mk/d2, where m is the mass of the rocket, d is the distance of the rocket from the center of Earth, and k is a constant. 172.  As the rocket travels away from Earth’s surface, there is a distance D where the rocket sheds some of its mass, since it no longer needs the excess fuel storage. We can write this function as F(d)=⎨(−m↓1 k / d^2) if d < D                                                                                  (−m↓2 k / d^2) if d ≥ D Is there a D value such that this function is continuous, assuming m1≠m2?
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