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)40 N ∙ m
B)10 N ∙ m
C)5.0 N ∙ m
D)20 N ∙ m
E)30 N ∙ m

Question

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)40 N ∙ m 
B)10 N ∙ m 
C)5.0 N ∙ m 
D)20 N ∙ m 
E)30 N ∙ m

Quizplus · Accepted Answer

The Answer of 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)40 N ∙ m 
B)10 N ∙ m 
C)5.0 N ∙ m 
D)20 N ∙ m 
E)30 N ∙ m

A Uniform Rod Weighs 40 N and Is 1