# I need help with a Physics Problem **URL:** \ **Category:** NYSpeed Off Topic\ **Created:** [June 2, 2008, 7:22pm UTC](https://forums.speedlife.net/t/i-need-help-with-a-physics-problem/49426 "2008-06-02T19:22:49Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![Tunerfreak](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/tunerfreak/32/7427_2.png) [@Tunerfreak](https://forums.speedlife.net/u/Tunerfreak)\ **Post date:** [June 2, 2008, 7:22pm UTC](https://forums.speedlife.net/t/i-need-help-with-a-physics-problem/49426/1 "2008-06-02T19:22:49Z")
it has to do with vectors its an online HW assignment and i dont understand why i got it wrong here is the question: The two vectors ![http://edugen.wiley.com/edugen/courses/crs1650/art/qb/qu/imgPenta/low/avec.gif](http://edugen.wiley.com/edugen/courses/crs1650/art/qb/qu/imgPenta/low/avec.gif) and ![http://edugen.wiley.com/edugen/courses/crs1650/art/qb/qu/imgPenta/low/bvec.gif](http://edugen.wiley.com/edugen/courses/crs1650/art/qb/qu/imgPenta/low/bvec.gif) in Fig. 3-30 have equal magnitudes of 14.4 m and the angles are θ1 = 33° and θ2 = 107°. Find (a) the _x_ component and (b) the _y_ component of their vector sum ![http://edugen.wiley.com/edugen/courses/crs1650/art/qb/qu/imgPenta/low/rvec.gif](http://edugen.wiley.com/edugen/courses/crs1650/art/qb/qu/imgPenta/low/rvec.gif), © the magnitude of ![http://edugen.wiley.com/edugen/courses/crs1650/art/qb/qu/imgPenta/low/rvec.gif](http://edugen.wiley.com/edugen/courses/crs1650/art/qb/qu/imgPenta/low/rvec.gif), and (d) the angle ![http://edugen.wiley.com/edugen/courses/crs1650/art/qb/qu/imgPenta/low/rvec.gif](http://edugen.wiley.com/edugen/courses/crs1650/art/qb/qu/imgPenta/low/rvec.gif) makes with the positive direction of the _x_ axis. my answers: A. 7.867 m B. 21.614 m C. 23.001 m D. 70 degrees to fine Rx i found the components Ax+Bx and Ry = Ay+By then to get R i did the pythagorean theorem and to find Theta i did inverse Tan (Ry/Rx). its bugging me cause i dont see where i went wrong ---
**Author:** ![bigwoode](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/bigwoode/32/5175_2.png) [@bigwoode](https://forums.speedlife.net/u/bigwoode)\ **Post date:** [June 2, 2008, 7:42pm UTC](https://forums.speedlife.net/t/i-need-help-with-a-physics-problem/49426/2 "2008-06-02T19:42:57Z")
when youre dealing with vector magnitude i think it is just the absolute value, i got the same y component, but my x component i just did absolute values and got 16.29, i am not sure though… is this Wiley physics? Could be incorrect significant figures ---
**Author:** ![Tunerfreak](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/tunerfreak/32/7427_2.png) [@Tunerfreak](https://forums.speedlife.net/u/Tunerfreak)\ **Post date:** [June 2, 2008, 7:49pm UTC](https://forums.speedlife.net/t/i-need-help-with-a-physics-problem/49426/3 "2008-06-02T19:49:57Z")
yes its wiley here is the solution and it makes not sense, i dont think its even the same problem as given [http://edugen.wiley.com/edugen/shared/assignment/test/qsolution.uni?itemid=c03q\_1\_17](http://edugen.wiley.com/edugen/shared/assignment/test/qsolution.uni?itemid=c03q_1_17) ---
**Author:** ![RedGoober4Life](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/redgoober4life/32/7610_2.png) [@RedGoober4Life](https://forums.speedlife.net/u/RedGoober4Life)\ **Post date:** [June 2, 2008, 7:54pm UTC](https://forums.speedlife.net/t/i-need-help-with-a-physics-problem/49426/4 "2008-06-02T19:54:42Z")
what # is it in the book? And I second the sig figs notion. Wiley is a huge cock. Is Eric the teacher? He’s the best. ---
**Author:** ![Tunerfreak](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/tunerfreak/32/7427_2.png) [@Tunerfreak](https://forums.speedlife.net/u/Tunerfreak)\ **Post date:** [June 2, 2008, 7:57pm UTC](https://forums.speedlife.net/t/i-need-help-with-a-physics-problem/49426/5 "2008-06-02T19:57:03Z")
its chapter 3 #17 in the book but i just looked at the book and its not the same as the problem given online but yet the answer for online is the answer for the book?? here is the online problem [http://edugen.wiley.com/edugen/shared/assignment/test/qview.uni?id=quest363815entrance1&selected\_question=quest363815&operation=take-question](http://edugen.wiley.com/edugen/shared/assignment/test/qview.uni?id=quest363815entrance1&selected_question=quest363815&operation=take-question) ---
**Author:** ![RedGoober4Life](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/redgoober4life/32/7610_2.png) [@RedGoober4Life](https://forums.speedlife.net/u/RedGoober4Life)\ **Post date:** [June 2, 2008, 8:11pm UTC](https://forums.speedlife.net/t/i-need-help-with-a-physics-problem/49426/6 "2008-06-02T20:11:08Z")
It’s #19 in the 7th edition. 😉