A bar rotates about fixed axis O. Find the magnitude of the acceleration of point A. • α = 36 rad/s2 . • @ = 11 rad/s • L = 0.13 m O 3 a L A
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- 84. •Medical In a laboratory test of tolerance for high angular acceleration, pilots were swung in a circle 13.4 m in diameter. It was found that they blacked out when they were spun at 30.6 rpm (rev/min). (a) At what acceleration (in SI units and in multiples of g) did the pilots black out? (b) If you want to decrease the acceleration by 25.0% without changing the diameter of the circle, by what percent must you change the time for the pilot to make one spin?Prob 1 by a = 2₁-3j m/s² Vo = 40₁-30j m/ 5² 7 x 11 » when y=. p= ? at this velocity Note: a = 21-3j m/s^2 Initial vel=401-30j m/s question: v= ? when y=-30 m/s and radius of curvature= ? at this velocity =-30mChapter 7 question 33
- 6. In Fig., solve for RT, Ih, V1, V2, V3, V4, Vs, V6, V7, I1, ½, Iz, I4, Is, I6, and I7. R = 1.5 kN R = 10 kn V, = 36 V R = 15 k2 Ra= 10 k2 R = 15 kn R, = 1 kN R = 5 kNA wheel has a radius of 8 m. How far (path length) does a point on the circumference travel if the wheel is rotated through angles of 50 rev. a. 2513 m O b. 2931 m O c. 1590 m O d. 2308 m60 m/s 20 OB 20 m s 5ה tan Normal and Tangential Coordinates 3. Determine the increase in speed and the normal component of acceleration at s = 2 m. At s = 0, v = 0. s = 2 m v = 4 m/s 2 m 4. Determine the acceleration at the inştant shown. The particle has a constant speed of 2 m/s. y 2x 2 m/s Datermine the acceleration at s = 2 m if v' = (2 s) m/s, where s is in meters. 大
- 4. DETAILS MY NOTES = Let B = 5.50 m at 60.0°. C and A have equal magnitudes. The direction angle of C is larger than that of A by 25.0°. Let A B 29.1 m² and B C 33.9 m². Find the magnitude (in m) and direction (in degrees) of A. magnitude direction x °Question 7 A roller coaster car moves on a track with one section that is a vertical circular loop of radius R. When the car is at the top of the loop it just maintains contact with the track. What is the car's velocity at this point? Rg 09/20 Zero R ORg39 - a) 265 m/s^2 B) 231 m/s^2 NS) 278 m/s^2 D) 325 m/s^2 TO) 377 m/s^2