How much times does it take for the first black/clear part to fall through the photo gate timer, starting from the rest? Plastic strip has 8 black stripes and 8 clear stripes the width of the black/clear pair is 5 cm.

Question

Singh

Mathematics

8 October, 01:49

How much times does it take for the first black/clear part to fall through the photo gate timer, starting from the rest? Plastic strip has 8 black stripes and 8 clear stripes the width of the black/clear pair is 5 cm.

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Answers (1)

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Pooh · Answer 1

I can figure out this is a frefall motion.

Starting from rest = > Vo = 0

Then, use the equation: d = [1/2]gt^2 = > t = √ (2d/g)

d = width of a black/clear stripe pair = 5cm = 0.05m

g ≈ 10 m/s^2 (the real value is about 9.81 m/s^2)

t = √ (2*0.05m/10m/s^2) = 0.1 s

Answer: approximately 0.1 s