Chap3 - 15. (a) Strategy Since the angle is below the...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
15. (a) Strategy Since the angle is below the + x -axis, it is negative. S o l u t i o n Compute the components. 7.1cos( 14 ) 6.9 and 7.1sin( 14 ) 1.7 . xy BB = − °= = − °= − y x 7.1 B C x = - 1.8 C y = - 6.7 14° (b) Strategy The components of C r are given. Use the Pythagorean theorem. Solution Compute the magnitude and direction of . C r 22 2 2 1 (1 . 8 ) (6 . 7 ) 6 . 9 6.7 tan 15 CW from the -axis 1.8 CCC y θ =+ = + −= == ° (c) Strategy Add the components of the vectors to find the components of the vector sum. Use the Pythagorean theorem. Give the angle with respect to the axis to which it lies closest. Solution Find the magnitude and direction of . + CB r r 2 2 ( ) ( ) ( 1.8 6.9) ( 6.7 1.7) 9.8 xx yy += + + + =−+ + − − = r r and 1 8.4 tan 31 CCW from the -axis . 5.1 y ° (d) Strategy Use the components of and r r to find those of . r r Solution Compute the magnitude and direction. 2 2 1 ( ) ( ) ( 1.8 6.9) [ 6.7 ( 1.7)] 10 5.0 tan 30 CCW from the -axis 8.7 x + − =−− + −− = ° r r (e) Strategy Use the components of and r r to find those of . r r Solution Compute the components.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/01/2009 for the course PHY 2130 taught by Professor Rehse during the Winter '08 term at Wayne State University.

Page1 / 3

Chap3 - 15. (a) Strategy Since the angle is below the...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online