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ahrayia [7]
3 years ago
6

A car travel with a constant velocity of 20.5m/s for 20seconds what distance does it cover in this time ?​

Physics
1 answer:
prohojiy [21]3 years ago
8 0

Answer:

410 m

Explanation:

Given:

v₀ = 20.5 m/s

a = 0 m/s²

t = 20 s

Find: Δx

Δx = v₀ t + ½ at²

Δx = (20.5 m/s) (20 s) + ½ (0 m/s²) (20 s)²

Δx = 410 m

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Although these quantities vary from one type of cell to another, a cell can be 1.9 μm in diameter with a cell wall 60 nm thick.
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Answer: 2(10)^{-9} mg

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d=1.9\mu m=1.9(10)^{-6} m

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On the other hand, we know the thickness of the cell wall is r_{t}=60 nm= 60(10)^{-9} m and its density is the same as water (\rho=997 kg/m^{3}).

Since density is the relation between the mass m and the volume V:

\rho=\frac{m}{V}

The mass is: m=\rho V (1)

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V=\frac{4}{3}\pi R^{3} (2)

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Knowing 1 kg=1000 g and 1 mg=0.001 g:

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