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Lesechka [4]
2 years ago
13

A train travels 2km in 100 seconds. find the velocity of the train

Physics
1 answer:
AVprozaik [17]2 years ago
3 0

Answer:

20m/s = 72km/h

Explanation:

change 2km=2000m

The speed of the train is

v.t=S <=> v=S/t=2000/100=20 m/s

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What is the increase in pressure required to decrease volume of mercury by 0.001%
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Explanation:

Using Boyles law

Boyle's law states that, the volume of a given gas is inversely proportional to it's pressure, provided that temperature is constant

V ∝ 1 / P

V = k / P

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Then,

V_1 • P_1 = V_2 • P_2

So, if we want an increase in pressure that will decrease volume of mercury by 0.001%

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Let initial pressure be P_1 = P

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Using the equation above

V_1•P_1 = V_2•P_2

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Make P_2 subject of formula by dividing be 0.00001•V

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Now, using bulk modulus

Bulk modulus of mercury=2.8x10¹⁰N/m²

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-∆V = 10^-5•V

-∆V/V = 10^-5

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