Cars B and C are waiting at a stop sign when box truck A (whose driver had fallen asleep) rear- ends car B. At the time of impact: • box truck A (weighing 8500 lbs) was traveling at VA = 50 mph • the driver of car B (weighing 2500 lbs) had just taken his foot off the brake in anticipation of moving up in line • the woman driving car A (weighing 2500 lbs) still had her foot firmly on the brake because she could see the old man and his dog crossing the street across the intersection (d₂ = 24 ft) Assume all impacts are perfectly plastic (the cars remain stuck together after each impact). Determine: (a) What is the velocity of system AB after the first impact? (b) What is the velocity of system ABC immediately after the second impact? (c) The dog is young and nimble and can react quickly, but the man is old and slow and can't possibly react in time. What is the required coefficient of friction between tire and road for the man to not get hit? (d) On this particular day, the weather was overcast and drizzly, and the road was wet. Does the man get hit? Justify your answer.

Why is calculus needed for hydrostatic pressure and force application problems?

(a) With a neat sketch write short notes on a crane that can be lifted and unloaded within a circular area. (b) Write any two differences between a platform truck and a jib crane.

Subject: Mechanical engineering

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1. Present solution in personal handwriting. Place final answers in a box. 2. Present detailed drawings/FBD's illustrating your solution. 3ubmissions must be in pdf or jpeg with filename. ME-9SCTION LASTNAME 4. Somit accora epecified schecle andiesation. 5. Deduenons we made for otiAewingstuctions. PROBLEM 1 Determine the load that can be applied at the end of the rigid bar if the stress in either spring shown in the figure shall not exceed 200MP.. Spring 1 Spring 2 n 20 30 d. 10mm 20mm 150mm 120mm G 83GPA 35GPA 2m

Would the plank and the roller have the same acceleration why or why not?

1) Prof. K. climbed a wall and is now stuck and hungry. One of her ME 242 students saw this opportunity to test one of their pulley mechanisms to lift some pizza boxes for Prof. K. If the student is pulling the free end with a velocity of 2.75 ft/s. a) What is the mechanical advantage between the student and the pizza boxes? Hint: The link between pulleys 1 and 4 is rigid (meaning that they must move together. This is the key to solving this problem! b) What is the velocity of the pizza boxes? Be sure to indicate which direction it is moving. [Ans. to check: 1.375 ft/s] PizzA 49°F Sunny O 4x 99+ P Type here to search End PgUp PgDn PrtScn Home

9 Assignment Booklet 4B Science 24: Module 4 10. A 3-point belt, when worn properly, should fit A. snugly across the pelvis and loosely across the chest B. snugly across the pelvis and snugly across the chest G Joosely across the pelvis and loosely across the chest D. Joosely across the pelvis and snugly across the chest 11. A 4-point seat belt distributes forces more evenly across your and restrains both Return to page 79 of the Student Module Booklet and begin Lesson 3. Read question 12 carefully. Decide which of the choices BEST completes the statement. Place your answer in the blank space provided, 12. A modern air bag is designed to inflate in A. 0.330 s 27 B. 0.300 s C. 0.030 s D. 0.003 s up 10 (2 13. State two things an air bag is designed to do. 14. Explain why infant seats or small children should not be in the front passenger seat if the vehicle is equipped with a passenger-side air bag. 2 Submit your completed Assignment Booklet 4B to your teacher for assessment. Then return…

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