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Vika [28.1K]
2 years ago
10

in an effort to reach the store before it closed the motorist increase the speed of his car from 20 m per second to 60 meters pe

r second over a four second. What was the car's acceleration ​
Physics
1 answer:
Ber [7]2 years ago
7 0

Answer:

10

Explanation:

Givens

vi = 20 m/s

vf = 60 m/s

t = 4 second.

Formula

a = (vf - vi) / t

a = (60 - 20)/4

a = 40 / 4

a = 10 m/s^2

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A rock with a mass of 540 g in air is found to have an apparent mass of 342 g when submerged in water. (a) What mass of water is
AleksandrR [38]

(a) 198 g

When the rock is submerged into the water, there are two forces acting on the rock:

- its weight, equal to W=mg (m=mass, g=acceleration of gravity), downward

- the buoyant force, equal to B=m_w g (m_w=mass of water displaced), upward

So the resultant force, which is the apparent weight of the rock (W'), is

W'=W-B

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m'g = mg-m_w g

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(b) 1.98\cdot 10^{-4} m^3

If the rock is completely submerged, the volume of the rock corresponds to the volume of water  displaced.

The volume of water displaced is given by

V_w = \frac{m_w}{\rho_w}

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m_w = 198 g = 0.198 kg is the mass of the water displaced

\rho_w = 1000 kg/m^3 is the density of the water

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(c) 2727 kg/m^3

The average density of the rock is given by

\rho = \frac{m}{V}

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m = 540 g = 0.540 kg is the mass of the rock

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\rho = \frac{0.540 kg}{1.98\cdot 10^{-4}}=2727 kg/m^3

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