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xxTIMURxx [149]
3 years ago
6

I need help with question 4

Physics
1 answer:
stellarik [79]3 years ago
5 0
See if it’s answer A
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A flea walking along a ruler moves from the 45 cm mark to the 27 cm mark. It does this in 3 seconds. What is the speed? What is
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Answer:

Explanation:

In the calculation of distance we do not take into account the direction of movement .So only magnitude of movement is taken care of.

On the other hand , in respect of displacement , we take into account even direction of movement along with magnitude.

Distance covered by flea = 45 - 27 = 18 cm

Displacement by flea = 27 - 45 = - 18 cm

Speed = Distance covered / time

= 18 / 3 = 6 cm / s

Velocity = - 18 / 3 = - 6 cm /s.

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If the mass of a material is 45 grams and the volume of the material is 11 cm^3, what would the density of the material be?
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D=m÷v

D=45 g÷11 cm³

D=4.1 g/cm³

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