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Zepler [3.9K]
3 years ago
8

What is the acceleration of a car initially traveling at -5m/s and reaching -22m/s in 3s.

Physics
1 answer:
lozanna [386]3 years ago
4 0

Answer:

a=-5.67\ m/s^2

Explanation:

Given that,

Initial velocity, u = -5 m/s

Final velocity, v = -22 m/s

Time, t = 3s

We need to find the acceleration of the car. The formula of it is given by :

Acceleration,

a=\dfrac{v-u}{t}\\\\a=\dfrac{(-22)-(-5)}{3}\\\\a=-5.67\ m/s^2

So, the acceleration of the car is -5.67\ m/s^2.

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So, the more electronegative an element is, the more electrons it will attract.

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     heat of vaporization of water = 2257 J/g

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Here wee need to convert 1 kg ice from -13°C to vapor at 100°C

First the ice changes to -13°C from 0°C , then it changes to water, then its temperature increases from 0°C to 100°C, then it changes to steam.

Mass of water = 1000 g

Heat energy required to change ice temperature from -13°C to 0°C

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Heat energy required to change ice from 0°C to water at 0°C

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Heat energy required to change water temperature from 0°C to 100°C  

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Heat energy required to change water from 100°C to steam at 100°C  

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Total heat energy required

          H = H₁ +  H₂ + H₃ + H₄ = 27.17 + 334 + 418 +2257 = 3036.17 kJ

Heat energy needed = 3036.17 kJ

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