Drivers must be careful when driving close to cyclists, and should keep at least ____ feet apart when passing cyclists on the ro
ad.
A. 3
B. 4
C. 5
D. 6
1 answer:
Usually 3 feet but it depends on the state
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i got it right
Answer:

Explanation:
The given data :-
- Diameter of rod AB ( d₁ ) = 200 mm.
- Diameter of rod BC ( d₂ ) = 150 mm.
- The linear co-efficient of thermal expansion of copper ( ∝ ) = 1.6 × 10⁻⁶ /°C
- The young's modulus of elasticity of copper ( E ) = 120 GPa = 120 × 10³ MPa.
- Consider the required temperature increase to close the gap at C = T °C
- Consider the change in length of the rod = бL
Solution :-

![\begin{aligned}\delta L&= (\delta L _{thermal} +\delta L_{axial})_{AB} + ( \delta L _{thermal} +\delta L_{axial})_{BC}\\0& = (\delta L _{thermal} +\delta L_{axial})_{AB} + ( \delta L _{thermal} +\delta L_{axial})_{BC}\\&=\left[\alpha\:T\:L+\left(\frac{-RL}{AE}\right)\right]_{AB}+\left[\alpha\:T\:L+\left(\frac{-RL}{AE}\right)\right]_{BC}\\&=2\:\alpha\:T\:L-\frac{L}{E}(\sigma_{AB}+\sigma_{BC})\\T&=\frac{\sigma_{AB}+\sigma_{BC}}{2\alpha E}\end{aligned}](https://tex.z-dn.net/?f=%5Cbegin%7Baligned%7D%5Cdelta%20L%26%3D%20%28%5Cdelta%20L%20_%7Bthermal%7D%20%2B%5Cdelta%20L_%7Baxial%7D%29_%7BAB%7D%20%2B%20%28%20%5Cdelta%20L%20_%7Bthermal%7D%20%2B%5Cdelta%20L_%7Baxial%7D%29_%7BBC%7D%5C%5C0%26%20%3D%20%28%5Cdelta%20L%20_%7Bthermal%7D%20%2B%5Cdelta%20L_%7Baxial%7D%29_%7BAB%7D%20%2B%20%28%20%5Cdelta%20L%20_%7Bthermal%7D%20%2B%5Cdelta%20L_%7Baxial%7D%29_%7BBC%7D%5C%5C%26%3D%5Cleft%5B%5Calpha%5C%3AT%5C%3AL%2B%5Cleft%28%5Cfrac%7B-RL%7D%7BAE%7D%5Cright%29%5Cright%5D_%7BAB%7D%2B%5Cleft%5B%5Calpha%5C%3AT%5C%3AL%2B%5Cleft%28%5Cfrac%7B-RL%7D%7BAE%7D%5Cright%29%5Cright%5D_%7BBC%7D%5C%5C%26%3D2%5C%3A%5Calpha%5C%3AT%5C%3AL-%5Cfrac%7BL%7D%7BE%7D%28%5Csigma_%7BAB%7D%2B%5Csigma_%7BBC%7D%29%5C%5CT%26%3D%5Cfrac%7B%5Csigma_%7BAB%7D%2B%5Csigma_%7BBC%7D%7D%7B2%5Calpha%20E%7D%5Cend%7Baligned%7D)