A Navy captain going away from a lighthouse at the speed of 4[(√3) – 1] m/s. He observes that it takes him 1 minute to change the angle of elevation of the top of the lighthouse from 60o to 45o. What is the height (in metres) of the lighthouse?
Let height is H tan 600= H / BD = BD = H / tan600 [BD = H / √3 tan 450= AB / BC = AB = BC, BC = H 4(√3 – 1) m/s speed Time = 1 minute 60 Second Distance = Speed × Time = 4√3 – 1) × 60 = 240√3 – 240 CD = 240√3 – 60 CD = H – H/√3 = 240√3 – 240 H(√3 – 1) = 240√3(√3 – 1) H = 240√3 m
Which one of the following is not an organ of the government?
Two trains of same length are running in parallel tracks in the same direction with speed 70 km/hr and 120 km/hr respectively. The latter completely cro...
Which of the following provision/s of factories act 1948 is/are incorrect?
I. Every worker who has worked fo...
Rainbow is produced when sunlight falls on drops of rain. Which of the following physical phenomena are responsible for this?
(1) Dispersion
"Everyone as a member of the society has the right to social security, and is entitled to realization through national efforts and international cooper...
Who is the inventor of worldwide web?
What is the minimum age requirement to subscribe to the VPBY scheme?
Quality of petrol depends upon:
In 2023, which state launched the "Path Shri Rasta Shree" Project?
Vasco da Gama discovered the new and all-sea route from Europe to India and landed on 17th May 1498 at: