‘Skysails’ is that genre of engineering science that uses extensive utilization of wind energy to move a vessel in the sea water. The ‘Skysails’ technology allows the towing kite to gain a height of anything between 100 metres – 300 metres. The sailing kite is made in such a way that it can be raised to its proper elevation and then brought back with the help of a ‘telescopic mast’ that enables the kite to be raised properly and effectively. Based on the following figure related to sky sailing, answer the questions:

Q 24 - Standard.jpg

(i) In the given figure, if sin𝜃 = cos (3𝜃 − 30°), where 𝜃 and 3𝜃 − 30°  are acute angles, then find the value of 𝜃.

(ii) What should be the length of the rope of the kite sail in order to pull the ship at the angle 𝜃 (calculated above) and be at a vertical height of 200 m?

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  1. Class 10
  2. Solutions of Sample Papers for Class 10 Boards

Transcript

Question 24 ‘Skysails’ is that genre of engineering science that uses extensive utilization of wind energy to move a vessel in the sea water. The ‘Skysails’ technology allows the towing kite to gain a height of anything between 100 metres – 300 metres. The sailing kite is made in such a way that it can be raised to its proper elevation and then brought back with the help of a ‘telescopic mast’ that enables the kite to be raised properly and effectively. Based on the following figure related to sky sailing, answer the questions: (i) In the given figure, if sin 𝜃 = cos (3𝜃 − 30°), where 𝜃 and 3𝜃 − 30° are acute angles, then find the value of 𝜃. Given sin 𝜃 = cos (3𝜃 − 30°) Writing sin θ = cos (90° – θ) cos (90° – 𝜃)= cos (3𝜃 − 30°) Comparing angles 90° – 𝜃 = 3𝜃 − 30° 90° + 30° = 3θ + θ 120° = 4θ 4θ = 120° θ = 120/4 θ = 30° (ii) What should be the length of the rope of the kite sail in order to pull the ship at the angle 𝜃 (calculated above) and be at a vertical height of 200 m? In Δ ABC sin θ = 𝐴𝐵/𝐴𝐶 sin 30° = 200/𝐴𝐶 1/2 = 200/𝐴𝐶 AC = 2 × 200 AC = 400 m So, length of the rope is 400 m

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.