Answer to Question #170133 in Mechanics | Relativity for anonymous

Question #170133

A bacterium moves with a speed of 3.5  across a petri dish with a radius of 8.4 cm. How long does it take the bacterium to traverse the petri dish? (Hint: assume it travels through the centre of the dish.)



1
Expert's answer
2021-03-09T15:27:27-0500

The total distance the bacterium has to travell is d=28.4cm=16.8cmd = 2\cdot 8.4cm = 16.8cm (the diameter of the dish). I assume that the speed of the bacterium is v=3.5cm/minv = 3.5cm/min. Then the time it takes the bacterium to traverse the petri dish is:


t=dv=16.8cm3.5cm/min=4.8mint = \dfrac{d}{v} = \dfrac{16.8cm}{3.5cm/min} = 4.8min

Answer. 4.8 minutes.


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