Question
A boat is being rowed away from a cliff 183 m high. From
the top of the cliff, the angle of depression of the boat changes from 60° to 45° in 3 minutes. What is the speed of the boat?(approx.)Solution
According to the figure above: Cot 45° = (AD/AB) = 1= (AD/183) = 183 m Also, Cot 60° = (AC/AB) = (1/ √3 ) = (AC/150) = AC = (183/√3 ) m Therefore AC = (183 x √3 )/(√3 x √3) = 61√3 = 61 x 1.73 = 105.5 m Therefore CD = AD - AC = (183 - 105.5) = 77.5 m Speed of Boat = 77.5/180 m/s ((77.5/180) x (18/5) ) km/hr (1395/900) = 1.5km/hr
Recently International solar alliance has launched a tender to establish 1150 MW solar plant in which country?
Which company will partner with Dai-ichi Life to set up a Global Capability Centre (GCC) in India?Â
What fine has the Directorate General of Civil Aviation (DGCA) imposed on Air India, and for what violation recently?
Jio Payments Bank recently obtained a mutual fund distribution licence from which organization?
Which startup support platform under MeitY organized SANGAM 2025?
With reference to the Index of Industrial Production (IIP), consider the following statements:
       I.           This index...
What initiative has Amazon launched in Bengaluru to support technological education?
Indian Navy Participation Women20@g20 at which of the following city in 27 – 28 Feb 23?
When is the Indian Navy scheduled to commission the ASW-SWC Arnala ship?
REC Limited has signed an MoU with the ________ to jointly finance projects in the power, infrastructure, and logistics sectors over the next three year...
