Mathematical and Physical Journal
for High Schools
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# Problem G. 613. (November 2017)

G. 613. A vehicle undergoes circular motion at a constant speed of 72 km/h. How much time elapses until it gets back to the same point if its acceleration is 1.6 m/s$\displaystyle {}^2$?

(3 pont)

Deadline expired on December 11, 2017.

Sorry, the solution is available only in Hungarian. Google translation

Megoldás. A centripetális gyorsulásból és a sebességből kiszámítható, hogy a körpálya sugara

$\displaystyle R=\frac{v^2}{a}=\frac{20^2}{1{,}6}\,{\rm m}=250\,{\rm m}.$

Egy-egy kör megtételéhez szükséges idő:

$\displaystyle T=\frac{2\pi R}{v}=78{,}5~{\rm s}=1{,}3~\text{perc}.$

### Statistics:

 102 students sent a solution. 3 points: 90 students. 2 points: 6 students. 1 point: 1 student. 0 point: 5 students.

Problems in Physics of KöMaL, November 2017