Question

A 3.1-Ib force \( F \) is applied to the knob of the window-opener mechanism when the crank \( B C \) is horizontal. Determine the moment of the force about point \( A \) and about line \( A B \) (report both answers as vectors). Assume \( \mathrm{a}=1.5 \mathrm{in} ., \mathrm{b}=3.5 \mathrm{in} ., \mathrm{c}=1.1 \mathrm{in} \). , and \( \theta=28^{\circ} \). Answers: \[ \begin{array}{l} M_{A}=\text { ( } \\ \text { i + } \\ \text { j+ } \\ \text { k) lb-in. } \\ M_{A B}=( \\ \text { i } \\ \text { i + } \\ \text { i } \\ \text { j+ } \\ \text { i } \\ \text { k) lb-in. } \end{array} \]

          A 3.1-Ib force \( F \) is applied to the knob of the window-opener mechanism when the crank \( B C \) is horizontal. Determine the moment of the force about point \( A \) and about line \( A B \) (report both answers as vectors).
Assume \( \mathrm{a}=1.5 \mathrm{in} ., \mathrm{b}=3.5 \mathrm{in} ., \mathrm{c}=1.1 \mathrm{in} \). , and \( \theta=28^{\circ} \).

Answers:
\[
\begin{array}{l}
M_{A}=\text { ( } \\
\text { i + } \\
\text { j+ } \\
\text { k) lb-in. } \\
M_{A B}=( \\
\text { i } \\
\text { i + } \\
\text { i } \\
\text { j+ } \\
\text { i } \\
\text { k) lb-in. }
\end{array}
\]

A 3.1-Ib force F is applied to the knob of the window-opener mechanism when the crank B C is horizontal. Determine the moment of the force about point A and about line A B (report both answers as vectors).
Assume a=1.5 in ., b=3.5 in ., c=1.1 in. , and θ=28^∘.

Answers:

MA= (
i +
j+
k) lb-in.

MA B=(
i
i +
i
j+
i
k) lb-in.

Added by Abigail R.

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