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Nov 2013 p41 q3
4026
A cyclist exerts a constant driving force of magnitude \(F\) N while moving up a straight hill inclined at an angle \(\alpha\) to the horizontal, where \(\sin \alpha = \frac{36}{325}\). A constant resistance to motion of 32 N acts on the cyclist. The total weight of the cyclist and his bicycle is 780 N. The cyclist's acceleration is \(-0.2 \text{ m s}^{-2}\).
(i) Find the value of \(F\).
The cyclist’s speed is 7 m s-1 at the bottom of the hill.
(ii) Find how far up the hill the cyclist travels before coming to rest.
Solution
(i) Apply Newton's second law to the cyclist and bicycle system. The net force equation along the incline is: