Physics Exam: Projectiles and Motion - Prof. Scott L. Hendricks, Exams of Dynamics

Download Physics Exam: Projectiles and Motion - Prof. Scott L. Hendricks and more Exams Dynamics in PDF only on Docsity! 2s 7.03 m 3s 14.08 m 4s 36.4 m t s t s t s = ⇒ = = ⇒ = = ⇒ = 2 2 2 2s 5.21 m/s 3s 14.97 m/s 4s 28.0 m/s t a t a t a = ⇒ = = ⇒ = = ⇒ = Name______________________ ESM 2304 With Answers Test #4 February 11, 2009 Closed book, but you may use one 8½”x 11" formula sheet (one side only) with anything you hand-write on the one side of the sheet. There are 12 questions, equally weighted. 1. Fill in your name on this exam sheet. 2. Fill in your name and ID number on the orange opscan form 3. On the upper right-hand corner of the this test is a Form Letter. Fill in your Form letter on your opscan 4. You must show some supporting work on the test or you could receive no credit. Sign the following pledge: I have neither given nor received unauthorized aid on this exam. ___________________________ The velocity of a particle is given by where t is measured in seconds and v is2 5/22 4 3v t t= − + measured in meters per second. The particle is at position = 4 m at t = 0.0s 1. The position at time t is most nearly 1. 0 2. 3.03 m 3. 5.21 m 4. 7.03 m 5. 10.09 m 6. 14.08 m 7. 14.97 m 8. 28.0 m 9. 32.4 m 10. 36.4 m 2. The acceleration at time t is most nearly 1. 0 2. 3.03 m/s2 3. 5.21 m/s2 4. 7.03 m/s2 5. 10.09 m/s2 6. 14.08 m/s2 7. 14.97 m/s2 8. 28.0 m/s2 9. 32.4 m/s2 10. 36.4 m/s2 0 0 0 / 3 1.099 / / 4 1.386 / / 5 1.609 / f f f v v x k v v x k v v x k = ⇒ = = ⇒ = = ⇒ = 30 m 21.0 m/s 50 m 35.0 m/s 60 m 42.0 m/s d u d u d u = ⇒ = = ⇒ = = ⇒ = A test projectile is fired into a liquid so that where a is the acceleration, v is the2 ,a kv= − velocity and k is a constant. When it enters the fluid it has speed 0.v 3. When the speed has been reduced to a value of the projectile has traveled a distance of most nearly,fv 1. 0.200/k 2. 0.250/k 3. 0.333/k 4. 0.500/k 5. 0.693/k 6. 1.099/k 7. 1.386/k 8. 1.609/k 9. 1.80/k 10. 2.00/k 4. The distance d is given. The minimum speed u needed to just clear B is most nearly 1. 13.03 m/s 2. 16.61 m/s 3. 21.0 m/s 4. 21.7 m/s 5. 24.0 m/s 6. 27.7 m/s 7. 28.0 m/s 8. 33.2 m/s 9. 35.0 m/s 10. 42.0 m/s 2 2 2 50 lb, 40 lb 4.60 ft/s , 28.6 lb 60 lb, 50 lb 4.95 ft/s , 34.6 lb 40 lb, 30 lb 4.03 ft/s , 22.5 lb A B A A B A A B A W W a T W W a T W W a T = = ⇒ = = = = ⇒ = = = = ⇒ = = Released from rest, , .A BW W 9. The acceleration of A is most nearly 1. 2.01 ft/s2 2. 2.48 ft/s2 3. 2.93 ft/s2 4. 3.22 ft/s2 5. 4.03 ft/s2 6. 4.60 ft/s2 7. 4.95 ft/s2 8. 8.05 ft/s2 9. 8.78 ft/s2 10. 9.20 ft/s2 10. The tension in the cable attached to B is most nearly 1. 15.00 lb 2. 18.18 lb 3. 21.4 lb 4. 22.5 lb 5. 28.6 lb 6. 32.7 lb 7. 34.6 lb 8. 36.0 lb 9. 46.2 lb 10. 56.3 lb 2.58 s 0.119 2.68 s 0.172 2.78 s 0.219 k k k t t t μ μ μ = ⇒ = = ⇒ = = ⇒ = A skier starts from rest and passes a check point a time t later a distance 18 m down the slope. Neglect wind resistance 11. The coefficient of kinetic friction between the skis and the snow is most nearly 1. 0 2. 0.091 3. 0.119 4. 0.132 5. 0.168 6. 0.172 7. 0.219 8. 0.620 9. 0.667 10. 0.720 80 ft/s 265 ft 100 ft/s 414 ft 120 ft/s 596 ft u R u R u R = ⇒ = = ⇒ = = ⇒ = The projectile is launched with a speed u . The angle 2 = 30°. 12. The distance R is most nearly 1. 172.1 ft 2. 265 ft 3. 269 ft 4. 376 ft 5. 414 ft 6. 596 ft 7. 785 ft 8. 1377 ft 9. 2150 ft 10. 3098 ft