B 22, 34 C 48, 22 D 22, 48
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- 10. When granny hit the daycare, her Tesla started skidding in a northward direction at 12 m/s. At the same time, Mikey was running away in an easterly direction at 2.0 m/s. Draw the corresponding velocity vectors. What was Mikey's velocity relative to granny? (Granny was still in the skidding Tesla.) Draw the vector and give the magnitude and angle. W -15 -10 + -5 A N 12 10 ∞ 6 4 -2 -4 -6 -8 -10 -12 -14 S 5 10 15 EIf va=a1. a2 x a3 and vb=b1. b2 x b3 , by use of the vector relation a x (b x c) = b(a.c) - c(a.b) show that vb = 1/va. (Noted that b1, b2 and b3 are reciprocal vectors )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 °
- A fighter plane moving 211.0 m/s horizontally fires a projectile with speed 47 m/s in a forward direction 30.0° below the horizontal. What is the speed of the projectile with respect to a stationary observer on the ground? a) 240 m/s b) 283 m/s c) 253 m/s d) 278 m/sW Mot X DThe X G dece X x C G dece x S S Stud X E Grac X Grac XE Grac X G mot X G net X G g to X Revi X a classroom.google.com/u/0/c/M]Y4MTUXMDQ3MZQZ/a/MzExODMzNzQwOTQw/details c) What is the average velocity of each car for the first 10s? 4. A car is travelling at 10 m.s when the driver sees a police car. The driver brakes and decelerates at 4 m.s for 2 seconds. After 2 seconds of braking, the driver is confident that the police have not seen him so speeds up again to his original speed in 4 seconds and then maintains his original speed. 10 6. 8. 7. 5. 41 2. 1. 0 1 2 3 4 5 Time (s) a) What is the acceleration when the driver is speeding up again? 9. 7 8 9 10 b) What is lowest instantaneous velocity of the car and at what time does it occur? c) What is the displacement of the car travel under braking? Type here to search 6, 3. Velocity (m/s)5. The pilot of an aircraft flying north with respect to the ground, finds a wind blowing at 40 km / h to the east. If your speed relative to the ground is 80 km / h, what is the speed of your airplane relative to the air? choose an answer A B C D E 89 km/h 85 km/h 81 km/h 76 km/h 72 km/h