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Two donkeys are tied to the same pole.
One donkey pulls the pole at a strength of 
5N in a direction that is a 
50^(@) rotation from the east.
The other donkey pulls the pole at a strength of 
4N in a direction that is a 
170^(@) rotation from the east.
What is the combined strength of the donkeys' pulls?
Round your answer to the nearest tenth. You can round intermediate values to the nearest hundredth.

N

Two donkeys are tied to the same pole.\newlineOne donkey pulls the pole at a strength of 5 N 5 \mathrm{~N} in a direction that is a 50 50^{\circ} rotation from the east.\newlineThe other donkey pulls the pole at a strength of 4 N 4 \mathrm{~N} in a direction that is a 170 170^{\circ} rotation from the east.\newlineWhat is the combined strength of the donkeys' pulls?\newlineRound your answer to the nearest tenth. You can round intermediate values to the nearest hundredth.\newlineN \mathrm{N}

Full solution

Q. Two donkeys are tied to the same pole.\newlineOne donkey pulls the pole at a strength of 5 N 5 \mathrm{~N} in a direction that is a 50 50^{\circ} rotation from the east.\newlineThe other donkey pulls the pole at a strength of 4 N 4 \mathrm{~N} in a direction that is a 170 170^{\circ} rotation from the east.\newlineWhat is the combined strength of the donkeys' pulls?\newlineRound your answer to the nearest tenth. You can round intermediate values to the nearest hundredth.\newlineN \mathrm{N}
  1. Representing the forces as vectors: Represent the forces as vectors.\newlineThe first donkey pulls with a force of 5N5\,\text{N} at a 50°50° angle from the east. This can be represented as a vector with components (5cos(50°),5sin(50°))(5 \cdot \cos(50°), 5 \cdot \sin(50°)).\newlineThe second donkey pulls with a force of 4N4\,\text{N} at a 170°170° angle from the east. This can be represented as a vector with components (4cos(170°),4sin(170°))(4 \cdot \cos(170°), 4 \cdot \sin(170°)).
  2. Calculating the first donkey's force components: Calculate the xx and yy components of the first donkey's force.\newlineFor the first donkey:\newlinexx-component =5×cos(50°)5×0.642793.21395= 5 \times \cos(50°) \approx 5 \times 0.64279 \approx 3.21395\newlineyy-component =5×sin(50°)5×0.766043.8302= 5 \times \sin(50°) \approx 5 \times 0.76604 \approx 3.8302
  3. Calculating the second donkey's force components: Calculate the xx and yy components of the second donkey's force.\newlineFor the second donkey:\newlinexx-component =4×cos(170°)4×(0.98481)3.93924= 4 \times \cos(170°) \approx 4 \times (-0.98481) \approx -3.93924\newlineyy-component =4×sin(170°)4×0.173650.6946= 4 \times \sin(170°) \approx 4 \times 0.17365 \approx 0.6946
  4. Finding the resultant vector: Add the xx-components and yy-components of both vectors to find the resultant vector.\newlineResultant xx-component = 3.21395+(3.93924)0.725293.21395 + (-3.93924) \approx -0.72529\newlineResultant yy-component = 3.8302+0.69464.52483.8302 + 0.6946 \approx 4.5248
  5. Calculating the magnitude of the resultant vector: Calculate the magnitude of the resultant vector to find the combined strength of the donkeys' pulls.\newlineMagnitude = (x-component2+y-component2)\sqrt{(x\text{-component}^2 + y\text{-component}^2)}\newlineMagnitude ((0.72529)2+(4.5248)2)\approx \sqrt{((-0.72529)^2 + (4.5248)^2)}\newlineMagnitude (0.52605+20.4738)\approx \sqrt{(0.52605 + 20.4738)}\newlineMagnitude (20.99985)4.583\approx \sqrt{(20.99985)} \approx 4.583
  6. Rounding the magnitude of the resultant vector: Round the magnitude of the resultant vector to the nearest tenth. The combined strength of the donkeys' pulls 4.6N\approx 4.6\,\text{N}

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