Neco Model Questions Vol1 2017 Physics Question 28

Practice objective / multiple choice question 28 from the 2017 Neco Model Questions Vol1 Physics examination.

Neco Model Questions Vol1 2017 Physics Objective / Multiple Choice Medium Difficulty
Question 28 NECO_MODEL_QUESTIONS_VOL1 • 2017 • PHYSICS • objective

A boat can travel at a speed of \(5\ \text{m s}^{-1}\) in still water. A river flows uniformly at \(3\ \text{m s}^{-1}\). The river is \(200\ \text{m}\) wide. (a) At what angle upstream from the straight‑across direction must the boat be aimed so that it reaches a point directly opposite its starting point? (b) How long does the crossing take? (c) After reaching the opposite bank, the boat turns and rows directly upstream (against the current) at its still‑water speed for \(30\ \text{s}\). How far upstream from the opposite bank is the boat after this interval?

Answer Options

Correct Answer A. (a) \(\theta=\sin^{-1}(3/5)\approx36.9^{\circ}\); (b) \(50\ \text{s}\); (c) \(60\ \text{m}\) upstream
B. (a) \(\theta=\sin^{-1}(3/5)\approx30^{\circ}\); (b) \(50\ \text{s}\); (c) \(60\ \text{m}\) upstream
C. (a) \(\theta=\sin^{-1}(3/5)\approx36.9^{\circ}\); (b) \(60\ \text{s}\); (c) \(60\ \text{m}\) upstream
D. (a) \(\theta=\sin^{-1}(3/5)\approx36.9^{\circ}\); (b) \(40\ \text{s}\); (c) \(45\ \text{m}\) upstream
Correct Answer
A
Correct Option:
(a) \(\theta=\sin^{-1}(3/5)\approx36.9^{\circ}\); (b) \(50\ \text{s}\); (c) \(60\ \text{m}\) upstream

About This Question

This is Neco Model Questions Vol1 2017 Physics Question 28. It is one of the objective questions from the 2017 Neco Model Questions Vol1 Physics examination.

Difficulty level: Medium .

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