Question

You don't have to about korean. It just means questions.

5 151 1 The velocities of a plane and a helicopter relative to the ground are: 7, --300 mph î + 400 mph į V, = 100 mph î + 200 mph į What is the magnitude of the plane's velocity relative to the ground (to three significant figures)? 196 12 (Continued from previous question) What is the magnitude of the helicopter's velocity relative to the ground (to three significant figures)?

Answer 1

90 1) The relocity of the plane, J-300 mph in + 400 mphj magnitude, Upl= (-300) + (400)? 2.5 x 10 mph with INp) - 500 mph

2) The velocity of the helicopter, In = 100 mphit 200 mph) magnitude, shul- 1100)2 + (200) Wal = 224 mph Dot 3) Product of two velocity vectors, V = Town = (-300 i +4003). 600 l - 30000 + 80000ſ [: 1.1=1 , ; . = 1 + 200;) 2 - i. j = j. 1 - 0] / between two veltor .. Cos 0 = 4) Vp. Tn = To Lin Cos o O= angle Ivo. Tal 10.11 (-30000)2+(8000u)? (500 ) ( 224) ...0 = Cos (0.762 ) -(0.76 2 ) = 40.28 °-140.30) - = 0.762 Au.