A boat is being rowed away from a cliff 270 m high. From the top of the cliff, the angle of depression of the boat changes from 60° to 45° in 2 minutes. What is the speed of the boat?
According to the figure above: tan 45° = 270/(a + b) ⇒ 1 = 270/(a + b) ⇒ a + b = 270 Also, tan 60° = 270/a ⇒ √ 3 = 270/a ⇒ a = 270/ √ 3 ⇒ a = 90√ 3 = 155.8 ∴ b = 270 - 155.8 = 114.2 ⇒ The boat covers a distance of 114.2 m in 2 minutes. ∴ Speed of the boat = (114.2 x 60)/(2 x 1000) km/h = 3.4 km/h
The predominant sugar in insect hemolymph is
When any plane passing through the central axis of the body divides the organism into two identical halves called
Indian Agriculture Research Institute was established in Pusa (Bihar) in the year ___
In C4 plants, Calvin cycle works at
Whether use of Iodized Salt is mandatory in standardized products, which specify the use of Edible Common Salt?
Which of the following rural development programme launched before independence?
'Sugar baby' is a cultivar of -
Bacterial leaf blight of rice caused by Xanthomonas oryzae can be identified by
Who is regarded as the "FOUNDER OF MODERN MYCOLOGY"?
The appropriate dose (g/ha) of Metsulfuron for wheat is: