Which fractures tend to occur first when a pane of glass is struck?
a. radial fractures
b.
concentric fractures
c. spider web fractures
d. impact fractures

Radial fractures tend to occur first when a pane of glass is struck.

Option A

Explanation:

There is a slight difference between radial and concentric fractures and as radial fractures are formed which extends outwards in a radial manner  from the point where the glass is struck.

Whereas concentric fractures are circular in pattern and they terminate long before radial crack. Also when a bullet is fired from a gun, a similar reaction is observed as it gets struck on the surface and fractures are formed in the same pattern.

total distance travelled = 60 miles

total time taken =1.5 hours

average speed = total distance / total time

60 / 1.5

= 40

therefore, average speed = 40 m/h

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snell's law

refractve index = sin incidence / sin refraction