Math  /  Geometry

QuestionAfter a mishap, a 76.0kg76.0-\mathrm{kg} circus performer clings to a trapeze, which is being pulled to the side by another circus artist, as shown here. Calculate the tension in the two ropes if the person is momentarily motionless. Include a free-body diagram in your solution.

Studdy Solution

STEP 1

1. The system is in static equilibrium, meaning the net force in both the horizontal and vertical directions is zero.
2. The weight of the circus performer acts vertically downward.
3. The angles given are with respect to the vertical and horizontal as described.

STEP 2

1. Draw a free-body diagram.
2. Set up equations for equilibrium conditions.
3. Solve for the tensions in the ropes.

STEP 3

Draw a free-body diagram of the forces acting on the trapeze. Include: - The weight w=mg w = mg acting downward, where m=76.0kg m = 76.0 \, \text{kg} and g=9.8m/s2 g = 9.8 \, \text{m/s}^2 . - Tension T1 T_1 at an angle 15 15^\circ from the vertical. - Tension T2 T_2 at an angle 10 10^\circ from the horizontal.

STEP 4

Set up the equilibrium conditions for the vertical forces. The sum of vertical components of the tensions must equal the weight:
T1cos(15)+T2sin(10)=mg T_1 \cos(15^\circ) + T_2 \sin(10^\circ) = mg

STEP 5

Set up the equilibrium conditions for the horizontal forces. The horizontal components of the tensions must cancel each other out:
T1sin(15)=T2cos(10) T_1 \sin(15^\circ) = T_2 \cos(10^\circ)

STEP 6

Solve the system of equations for T1 T_1 and T2 T_2 .
First, solve for T2 T_2 using the horizontal equilibrium equation:
T2=T1sin(15)cos(10) T_2 = \frac{T_1 \sin(15^\circ)}{\cos(10^\circ)}
Substitute T2 T_2 into the vertical equilibrium equation:
T1cos(15)+(T1sin(15)cos(10))sin(10)=mg T_1 \cos(15^\circ) + \left(\frac{T_1 \sin(15^\circ)}{\cos(10^\circ)}\right) \sin(10^\circ) = mg
Simplify and solve for T1 T_1 :
T1(cos(15)+sin(15)sin(10)cos(10))=mg T_1 \left( \cos(15^\circ) + \frac{\sin(15^\circ) \sin(10^\circ)}{\cos(10^\circ)} \right) = mg
T1=mgcos(15)+sin(15)sin(10)cos(10) T_1 = \frac{mg}{\cos(15^\circ) + \frac{\sin(15^\circ) \sin(10^\circ)}{\cos(10^\circ)}}
Calculate T1 T_1 :
T1=76.0×9.8cos(15)+sin(15)sin(10)cos(10) T_1 = \frac{76.0 \times 9.8}{\cos(15^\circ) + \frac{\sin(15^\circ) \sin(10^\circ)}{\cos(10^\circ)}}
T1746.6N T_1 \approx 746.6 \, \text{N}
Now calculate T2 T_2 :
T2=746.6×sin(15)cos(10) T_2 = \frac{746.6 \times \sin(15^\circ)}{\cos(10^\circ)}
T2195.2N T_2 \approx 195.2 \, \text{N}
The tensions in the ropes are approximately T1=746.6N T_1 = 746.6 \, \text{N} and T2=195.2N T_2 = 195.2 \, \text{N} .

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