EF 152 Exam #1, Spring, 2011 Page 1 of 5

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1 E 15 Exam #1, Sping, 011 Page 1 of 5 Name: Section: Guidelines: Assume 3 significant figues fo all given numbes unless othewise stated Show all of you wok no wok, no cedit Wite you final answe in the box povided Include units fo all answes Stess and Stain Stess A L Stain L L L AE E acto of Safety (S) Stength S Load luids p pessue h height ρ mass density v velocity K empiical constant A aea d depth p 0 pessue on top of fluid Consevation of Mass (Continuity) v A v 1 1 A Benouilli s Equation 1 p1 v1 gh1 1 p v gh Lift L KAv Pessue in a fluid p gd p 0 Convesions 1 ft 3 = 7.48 gal 1 m 3 = 1000 L Unifom Cicula Motion v a n (any cuve) a n v Stokes Law dag 6v Poiseuille s Equation Q 4 Density of Wate 6.4 lb/ft kg/m 3 p1 p 8 L η wate =1.0 x10-3 Pa s Atmospheic Pessue kpa 14.7 psi Univesal Law of Gavitation m1m G G G = 6.674x10-11 N-m /kg Keple s Thid Law T R 3 Gm Satellites G me v e h G m vesc G m me U e eath = 6.38x10 6 m m eath = 5.97x10 4 kg Instuctions Do not open the exam until instucted to do so. Do not leave if thee is less than 5 minutes to go in the exam. When time is called, immediately stop witing, emain seated, and pass you exam to the cente aisle. Do not stand up o leave until all exams have been collected. ont Back 9: Elizabeth - Abby 11:10 3 Elizabeth 4 - Isaac 1:40 5 Abby 6 - Isaac :10 7 Patick 8 - Shane 3:40 9 Patick 10 - Shane e e

2 E 15 Exam #1, Sping, 011 Page of 5 1. (4 pts) If the escape velocity on planet Peal is 1000m/s, what is the mass of the planet? ( Peal = 5.x10 3 m). (4 pts) Bowling balls 1 and ae identical. Ball 1 is submeged 5.5 inches in wate, while ball is submeged 10 inches in wate. Which one of the following statements is tue? = A. Buoy1 Buoy > B. Buoy1 Buoy < C. Buoy1 Buoy 3. (4 pts) To make an omelet, D. Bennett puts oil in a hot fying pan. What will happen to the viscosity of the oil as the oil is heated? A. Incease B. Decease C. Stay the same 4. (4pts) An object will float if : A. RD > 1 B. RD < 1 C. RD = 1

3 E 15 Exam #1, Sping, 011 Page 3 of 5 5. (14 pts) A foce is applied to the end of a 3-m long unifom boad weighing 150N in ode to keep it in equilibium. The mass of the sign is 30kg. Detemine the total magnitude of the eaction foce at the wall. A sepaate, complete BD is equied fo full cedit. 65 Hotel Vacancy 1.5m 1.5m 6. (14 pts) Detemine the minimum foce to keep the box fom tipping ove. Assume the cente of mass of the box is at the middle of the box. A sepaate, complete BD is equied fo full cedit. 3 ft 6 ft 1.5ft 400 lb 60 35

4 E 15 Exam #1, Sping, 011 Page 4 of 5 7. (14 pts) A steel column suppoting the uppe deck of the Cowboys stadium in Alington, Texas is 130 ft tall. When suppoting 00 fans it is compessed 0.1 inches. If the aveage weight of a football fan is 185 lb, what is the coss sectional aea of the column? (E steel = 9x10 6 psi). 8. (14 pts) A 3500 kg spacecaft is being shot towads Mas. The weight of the 150 kg captain of the spacecaft is measued to be 300 N. How high above the eath s suface is the spacecaft? Spacecaft Eath

5 E 15 Exam #1, Sping, 011 Page 5 of 5 9. (14 pts) When a 5 kg toy ca is submeged in wate and held up by a scale, the scale eads 30N. What is the mass density of the ca? 10. (14 pts) A Pitot Tube is modified to ceate a Z-shaped tube as shown. This is placed in a flowing steam of wate. The wate exits the tube with a speed of 4 ft/s. What is the speed of the wate in the steam? 7 in 4 ft/s 5 in

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