Physics equations/09-Statics and Torque/Q:torques

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Practice quiz

1

A massless bar of length, S = 7.6m is attached to a wall by a frictionless hinge (shown as a circle). The bar is held horizontal by a string that makes and angle θ = 37.4 degrees above the horizontal. An object of mass, M = 6kg is suspended at a length, L = 5.4m from the wall. What is the tension, T, in the string?

	a) 3.45E+01 N
	b) 4.34E+01 N
	c) 5.46E+01 N
	d) 6.88E+01 N
	e) 8.66E+01 N

2

In the figure shown, L₁ = 5.3m, L₂ = 4.3m and L₃ = 7.3m. What is F₁ if F₂ =3.6N and F₃ =5.1N?

	a) 8.21E+00 N
	b) 9.95E+00 N
	c) 1.20E+01 N
	d) 1.46E+01 N
	e) 1.77E+01 N

3

A massless bar of length, S = 8.1m is attached to a wall by a frictionless hinge (shown as a circle). The bar is held horizontal by a string that makes and angle θ = 28.2 degrees above the horizontal. An object of mass, M = 9.2kg is suspended at a length, L = 5.7m from the wall. What is the x (horizontal) component of the force exerted by the wall on the horizontal bar?

	a) 8.06E+01 N
	b) 9.77E+01 N
	c) 1.18E+02 N
	d) 1.43E+02 N
	e) 1.74E+02 N

4

In the figure shown, L₁ = 6.5m, L₂ = 4.5m and L₃ = 7.8m. What is F₂ if F₁ =0.56N and F₃ =0.4N?

	a) 6.50E-02 N
	b) 7.87E-02 N
	c) 9.54E-02 N
	d) 1.16E-01 N
	e) 1.40E-01 N

5

A massless bar of length, S = 9.5m is attached to a wall by a frictionless hinge (shown as a circle). The bar is held horizontal by a string that makes and angle θ = 26.5 degrees above the horizontal. An object of mass, M = 6.8kg is suspended at a length, L =6.6m from the wall. What is the y (vertical) component of the force exerted by the wall on the horizontal bar?

	a) 1.39E+01 N
	b) 1.68E+01 N
	c) 2.03E+01 N
	d) 2.46E+01 N
	e) 2.99E+01 N

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