Question
A boat is being rowed away from a cliff 240 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?Solution
According to the figure above: tan 45° = 240/(a + b) ⇒ 1 = 240/(a + b) ⇒ a + b = 240 Also, tan 60° = 240/a ⇒ √ 3 = 240/a ⇒ a = 240/ √ 3 ⇒ a = 80√ 3 = 138.5 ∴ b = 240 - 138.5 = 101.5 ⇒ The boat covers a distance of 101.5 m in 3 minutes. ∴ Speed of the boat = (101.5 x 60)/(3 x 1000) km/h = 2.03 km/h
The concept of demand paging relies on:
What are the different modes of fiber optic communication?
Which of the following statements accurately describes the object-oriented programming (OOP) support in Java and C?
How many types of JDBC drivers?
A software developer is designing a banking application where each bank account object should restrict direct access to its balance variable to prevent ...
What is the primary goal of code optimization in software development?
Which of the following statements accurately describes the characteristics of a primary key in a relational database?
Which of the following statement is correct related to branch and bound method?
Which of the following is the last part of ICMP message format?
Which of the following protocol is a network layer protocol and used for reporting errors?
Relevant for Exams:
