Question

1430-251 Practice Exam 1 Word Layout References Mailings Review view Help ink to Shape ink to Math 20 points) Imagine you are looking down on an object from above. The object is initially moving parallel to the x-axis with a speed of 13 . Att = 0, it is subject to an acceleration of magnitude 3.7 directed at an angle of 23 above the positive x-axis. Show your work and be sure to include units for all parts of the question. 14 points) What are the x and y components of the object's acceleration? 3.405 a. [5 points) In what direction is the object moving at t = 4.0 s? Sin do 3.7 sjunge sim 23 sin 23 NI b. [5 points) What is the object's speed at t = 4.0 S?

Answer 1

Hii

hiven initial speed x = 13m/s Uy=0 a= 3.7 m/s² at 23° above n- axis aya = 3-7 m/s2 by 123 an this diagram as a cos23° = 3.7 Cos 23" Jan= 3.40 m/s2 1 ay= 3.7 sina 3 Jay = 1.445 m/s

(a) at t= 4 Second Vn= Untant = 13 +3.46 4 Un = 26.6 m/s vy= y + ayt = 0 +1.445 XY y = 5.78 m/s o = tant (u) = tant (528) so= 12-26°C so it is moving at 12.26'c from an axis (6) v = √v + Vyz = √26.62+ (5.782 IV: 27.22 m/s

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