(10%) Problem 10: Samuel is driving north at 70 mph. Elizabeth is driving east a
ID: 1884862 • Letter: #
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(10%) Problem 10: Samuel is driving north at 70 mph. Elizabeth is driving east at 45 mph. Use a coordinate system where positive x is east, and positive y is north 33% Part (a) What is Elizabeth's velocity relative to Samuel's velocity V 1, written as a vector in y notation Grade Sui Deductions Potential Yel = 45 -70 l 7 8 9 HOME Submissio Attempts r (5% per at detailed vi 0 VOI BACKSPACE | DEL| CLEAR Submit I give up! Hints: 0 for a 0% deduction. Hints remaining: 0 Feedback: 0% deduction per feedback Submission Historv All Date times are displayed in Eastern Standard Time Red submission date times indicate late work. Date l Sep 21,2018 2 Sep 21,2018 Time 4:29 PM 4:32 PM Hints Feedback Answer Vrei = 45 i + 70 j Vrel 45- 70j 33% Part (b) What is the magnitude of this relative Velocity? 33% Part (c) What is the direction,0, of this relative velocity? Provide you answer as an angle measured from the positive x axisExplanation / Answer
velocity of Samuel,
v1 = 70j mph
velocity of Elizabeth, v2 = 45i
Elizabeth velocity relative to Samuel,
V21 = V2 - V1 = 45i - 70j mph
(B) magnitude = sqrt(45^2 + 70^2) = 83.2 mph
(C) direction = 360 - tan^-1(70/45) = 303 deg CCW from x axis.
(or - 57 deg )
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