# 8 – Physics Help Please! Finding Torque?

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Refer to image: http://session.masteringphysics.com/problemAsset/1…

In this problem, you must express the angle (alpha) in the above equation in terms of (theta), (phi), and/or (pi) when entering your answers.

A. What is the torque (rA) about axis A due to the force (Fvector)?Express the torque about axis A at Cartesian coordinates (0,0). rA = ???

B. What is the torque rB about axis B due to the force Fvector? (B is the point at Cartesian coordinates (0,b), located a distance b from the origin along the y axis.) Express the torque about axis B in terms of F, theta, phi, pi, and/or other given coordinate data.

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C. What is the torque rC about axis C due to Fvector? (C is the point at Cartesian coordinates (c,0), a distance c along the x axis.) Express the torque about axis C in terms of F, theta, phi, pi, and/or other given coordinate data.

What is the torque about axis D due to ? Aswer same as the previous problems.

Thank you for your help!

• any torq is vector t=[r×F], where vector r is arm, vector F is force;

our F=|F|*(cos(θ), sin(θ), 0); A♠ r=0; t=0;

B♣ r=(0, -b, 0); t/|F|=

` i`` ``j`` `` ``k│

` ` 0`<code> -b</code><code> </code> `“0│ = (0, 0, bcos(θ)); |t| =|Fb*cos(θ)|;

│ cos(θ), sin(θ), 0│

C♣ r=(-c, 0, 0); t/|F|=

` i`` ``<code>j</code><code> </code></code><code> </code>k│`

`<code>-c</code></code><code> </code><code>0</code> 0│ = (0, 0, -csin(θ)); |t| =|Fc*sin(θ)|;`

│ cos(θ), sin(θ), 0│

D♣ r=(-dcos(φ), -dsin(φ), 0); t/|F|=

` i`` ``<code>j</code><code> </code></code><code> </code><code> </code>``k│`

│-dcos(φ), -dsin(φ), 0│ = (0, 0, -dcos(φ)sin(θ) + dsin(φ)cos(θ))=

│ cos(θ),` sin(θ),`0│

= (0, 0, dsin(φ-θ))=; |t| =|Fd*sin(φ-θ)|;

• Finding Torque Mastering Physics

• Part A) 0

Part B) bFcos(θ)

Part C) -cFsin(θ)

Part D) d*F*(φ-θ)

Source(s): Another Mastering Physics victim