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Alik [6]
3 years ago
9

a car travel the first 20km with a speed of 40km/h and the next 40km with a speed of 80km/h . find the average speed​

Physics
1 answer:
REY [17]3 years ago
3 0

Answer:

average speed is 60km/h

Explanation:

you sum up the speed attained in each distance covered and divide it by 2 to get your answer

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A substance has a vapor pressure of 77.86 mm Hg at 318.3 K and a vapor pressure of161.3 mmHg at 340. 7 K. Calculate its heat of
zavuch27 [327]

Explanation:

It is given that,

Initial vapor pressure, P₁ = 77.86 mm

Initial temperature, T₁ = 318.3 K

Final vapor pressure, P₂ = 161.3 mm

Initial temperature, T₂ = 340.7 K

We need to find its heat of vaporization. It can be calculated by using Clausius-Clapeyron equation.

ln(\dfrac{P_2}{P_1})=\dfrac{\Delta_{vap}H}{R}(\dfrac{1}{T_1}-\dfrac{1}{T_2})

\Delta _{vap} H=\dfrac{R\ ln(\dfrac{P_2}{P_1})}{(\dfrac{1}{T_1}-\dfrac{1}{T_2})}

\Delta _{vap} H=\dfrac{0.008 314\ ln(\dfrac{161.3}{77.86})}{(\dfrac{1}{318.3}-\dfrac{1}{340.7})}

\Delta _{vap} H=29.31\ kJ/mol

So, the heat of vaporization of a substance is 29.31 kJ/mol. Hence, this is the required solution.

4 0
3 years ago
Choose the word from the drop-down menu that completes each sentence. A/An star system is made of two stars. A/An star system is
Alenkinab [10]

Answer:

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Explanation:

A star system is a group of stars that orbit one another, through he influence of gravitational force. The Earth's star system is called solar system.

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Answer:

c

Explanation:

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True

Most photographs will be made using a shutter speed of 1/60 or faster.
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