Let a displacement vector in the (X,Y) plane be 5.0 m at a 30 degree angle with respect to the x-axis and the force vector 6.0 N at a -45 degree angle with respect to the x-axis. Calculate the work done by the force in moving an object that distance using both methods (trigonometry and vector components). Then calculate the torque acting at that displacement by that force about the origin of the axis system, including the direction of the torque. (Hint: it will be

College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
icon
Related questions
Question
100%
As noted in the text, the scalar product between two vectors A and B can be
calculated using trigonometry as:
Ả B = \Ä||B| cos 0
and the vector product as:
ẢxB = |Ã||B| sin 0 fA
In words, the scalar product between vectors A and B is the product of their
magnitudes and the cosine of the angle between them. The vector product
between vectors A and B is the product of their magnitudes and the sine of the
angle between them. The direction of the resulting vector is perpendicular to
the plane containing the vectors, with the sign of the vector following the right-
hand rule.
The right-hand rule is as follows: begin at vector A and curl the fingers of your
right hand toward vector B. The direction of your thumb is the direction of the
resulting vector. In the traditional sense, the positive direction is above a
horizontal plane and the negative direction is below it.
These quantities can also be calculated if the vectors are expressed in (i,j,k)
notation. If
A = Ayî + Ayƒ + A,k
and
B = B,1 + B,} + B,k
then
÷B = A,B, + A,By + A,B,
and
AxB = \A Ay Az =
(A,B, - A,B2)î + (A,B, – A,Bx)} + (A, B,- Ay Bx)k
|Bx By Bz
53%
Transcribed Image Text:As noted in the text, the scalar product between two vectors A and B can be calculated using trigonometry as: Ả B = \Ä||B| cos 0 and the vector product as: ẢxB = |Ã||B| sin 0 fA In words, the scalar product between vectors A and B is the product of their magnitudes and the cosine of the angle between them. The vector product between vectors A and B is the product of their magnitudes and the sine of the angle between them. The direction of the resulting vector is perpendicular to the plane containing the vectors, with the sign of the vector following the right- hand rule. The right-hand rule is as follows: begin at vector A and curl the fingers of your right hand toward vector B. The direction of your thumb is the direction of the resulting vector. In the traditional sense, the positive direction is above a horizontal plane and the negative direction is below it. These quantities can also be calculated if the vectors are expressed in (i,j,k) notation. If A = Ayî + Ayƒ + A,k and B = B,1 + B,} + B,k then ÷B = A,B, + A,By + A,B, and AxB = \A Ay Az = (A,B, - A,B2)î + (A,B, – A,Bx)} + (A, B,- Ay Bx)k |Bx By Bz 53%
Both the scalar and vector product have applications in mechanics. The
displacement vector and force vector can be multiplied by both methods,
resulting in different physical quantities.
If multiplied as a scalar product, the resulting quantity is the work done while
pushing or pulling an object from one location to another:
W = d = Fd cos 0
If multiplied as a scalar product, the result is the torque acting on the object,
causing it to begin spinning about an axis, or change its rate of spin:
T= ixF = Fr sin 0 în
When considering work done, the displacement is usually symbolized with a d'
(as in scalar distance) whereas with torque, the displacement is usually
symbolized with an 'r' (as in the radius of a spinning circle).
In this challenge exercise, we are asking you to confirm that both methods of
calculating the scalar and vector products.
Let a displacement vector in the (X,Y) plane be 5.0 m at a 30 degree angle with
respect to the x-axis and the force vector 6.0 N at a -45 degree angle with
respect to the x-axis.
Calculate the work done by the force in moving an object that distance using
both methods (trigonometry and vector components).
Then calculate the torque acting at that displacement by that force about the
origin of the axis system, including the direction of the torque. (Hint: it will be
either the +Z or -Z direction.)
Your solutions should show all the steps necessary to determine the final
answers.
53%
Transcribed Image Text:Both the scalar and vector product have applications in mechanics. The displacement vector and force vector can be multiplied by both methods, resulting in different physical quantities. If multiplied as a scalar product, the resulting quantity is the work done while pushing or pulling an object from one location to another: W = d = Fd cos 0 If multiplied as a scalar product, the result is the torque acting on the object, causing it to begin spinning about an axis, or change its rate of spin: T= ixF = Fr sin 0 în When considering work done, the displacement is usually symbolized with a d' (as in scalar distance) whereas with torque, the displacement is usually symbolized with an 'r' (as in the radius of a spinning circle). In this challenge exercise, we are asking you to confirm that both methods of calculating the scalar and vector products. Let a displacement vector in the (X,Y) plane be 5.0 m at a 30 degree angle with respect to the x-axis and the force vector 6.0 N at a -45 degree angle with respect to the x-axis. Calculate the work done by the force in moving an object that distance using both methods (trigonometry and vector components). Then calculate the torque acting at that displacement by that force about the origin of the axis system, including the direction of the torque. (Hint: it will be either the +Z or -Z direction.) Your solutions should show all the steps necessary to determine the final answers. 53%
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 2 steps with 1 images

Blurred answer
Similar questions
  • SEE MORE QUESTIONS
Recommended textbooks for you
College Physics
College Physics
Physics
ISBN:
9781305952300
Author:
Raymond A. Serway, Chris Vuille
Publisher:
Cengage Learning
University Physics (14th Edition)
University Physics (14th Edition)
Physics
ISBN:
9780133969290
Author:
Hugh D. Young, Roger A. Freedman
Publisher:
PEARSON
Introduction To Quantum Mechanics
Introduction To Quantum Mechanics
Physics
ISBN:
9781107189638
Author:
Griffiths, David J., Schroeter, Darrell F.
Publisher:
Cambridge University Press
Physics for Scientists and Engineers
Physics for Scientists and Engineers
Physics
ISBN:
9781337553278
Author:
Raymond A. Serway, John W. Jewett
Publisher:
Cengage Learning
Lecture- Tutorials for Introductory Astronomy
Lecture- Tutorials for Introductory Astronomy
Physics
ISBN:
9780321820464
Author:
Edward E. Prather, Tim P. Slater, Jeff P. Adams, Gina Brissenden
Publisher:
Addison-Wesley
College Physics: A Strategic Approach (4th Editio…
College Physics: A Strategic Approach (4th Editio…
Physics
ISBN:
9780134609034
Author:
Randall D. Knight (Professor Emeritus), Brian Jones, Stuart Field
Publisher:
PEARSON