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Matter In Our Surroundings

Question
CBSEENSC9005733
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A bus was moving in a straight line with a speed of 54 km/h. On applying brakes, it stopped in 8 s. Calculate the acceleration.

Solution
Here comma space I n i t i a l space v e l o c i t y comma space straight u space equals space fraction numerator 54 space km over denominator straight h end fraction space equals space fraction numerator 54 space cross times space 1000 space straight m over denominator 3600 space straight s end fraction space equals space 15 space straight m divided by straight s F i n a l space v e l o c i t y comma space v space equals space 0 T i m e space t a k e n space f o r space t h e space b i c y c l e space t o space s t o p comma space straight t space equals space 8 space straight s Acceleration comma space space straight alpha space equals space fraction numerator v minus straight u over denominator straight t end fraction space equals space fraction numerator 0 minus 15 over denominator 8 end fraction space equals space minus 1.87 space straight m divided by straight s squared. space

Some More Questions From Matter In Our Surroundings Chapter

What is the physical state of water at

100 °C

For any substance, why does the temperature remain constant during the change of state ?

Suggest a method to liquify atmospheric gases.

Convert the following temperatures to Kelvin scale.

35°C

Give reason for the following observations.

Naphthalene balls disappear with time without leaving any solid.

Give reason for the following observations.

We can get the smell of perfume sitting several metres away.

What is the physical state of water at

a) 25°C
b)00C
c)1000C

What is the physical state of water at
0°C

What is the physical state of water at
100°C

Give two reasons to justify
Water at room temperature is a liquid.

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