A uniform rod weighs 40 N and is 1.0 m long. It is hinged to a wall at the left end, and held in a horizontal position at the right end by a vertical string of negligible weight, as shown in the figure. What is the magnitude of the torque due to the string about a horizontal axis that passes through the hinge and is perpendicular to the rod? The hinge is very small with negligible friction.
$A uniform rod weighs 40 N and is 1.0 m long. It is hinged to a wall at the left end, and held in a horizontal position at the right end by a vertical string of negligible weight, as shown in the figure. What is the magnitude of the torque due to the string about a horizontal axis that passes through the hinge and is perpendicular to the rod? The hinge is very small with negligible friction. A) 5.0 \mathrm {~N} \cdot \mathrm { m } B) 20 \mathrm {~N} \cdot \mathrm { m } C) 40 \mathrm {~N} \cdot \mathrm { m } D) 30 \mathrm {~N} \cdot \mathrm { m } E) 10 \mathrm {~N} \cdot \mathrm { m }$
A)

5.0 \mathrm {~N} \cdot \mathrm { m }

20 \mathrm {~N} \cdot \mathrm { m }

40 \mathrm {~N} \cdot \mathrm { m }

30 \mathrm {~N} \cdot \mathrm { m }

10 \mathrm {~N} \cdot \mathrm { m }

A Light Board That Is 10 M Long Is Supported

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