A uniform 40.0-kg scaffold of length 6 m is supported by two light cables, as shown below. An 80 kg painter stands 1 m from the left end of the scaffold, and his painting equipment is 1.5 m from the right end. The tension in the left cable is twice that in the right cable. Find 1. The tension in the left cable = 2. The tension in the right cable = 3. The mass of the equipment: N N kg

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A uniform 40.0-kg scaffold of length 6 m is supported by two light cables, as shown below. An 80 kg
painter stands 1 m from the left end of the scaffold, and his painting equipment is 1.5 m from the
right end. The tension in the left cable is twice that in the right cable.
Find
1. The tension in the left cable =
2. The tension in the right cable =
3. The mass of the equipment =
N
99+
N
kg
Think & Prepare
1. If the plank is in equilbrium, torque about any point will be zero. Pick a point about which to
calculate torques.
2. Draw all forces and torques.
3. Write down the First Condition for Equilibrium symbolically.
4. Write down the Second Condition for Equilibrium symbolically.
5. How many unknowns are there? How many equations are there?
6. How can you solve the equations find the unkowns?
Transcribed Image Text:1. ch A uniform 40.0-kg scaffold of length 6 m is supported by two light cables, as shown below. An 80 kg painter stands 1 m from the left end of the scaffold, and his painting equipment is 1.5 m from the right end. The tension in the left cable is twice that in the right cable. Find 1. The tension in the left cable = 2. The tension in the right cable = 3. The mass of the equipment = N 99+ N kg Think & Prepare 1. If the plank is in equilbrium, torque about any point will be zero. Pick a point about which to calculate torques. 2. Draw all forces and torques. 3. Write down the First Condition for Equilibrium symbolically. 4. Write down the Second Condition for Equilibrium symbolically. 5. How many unknowns are there? How many equations are there? 6. How can you solve the equations find the unkowns?
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