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Matter In Our Surroundings

Question
CBSEENSC9005741
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A car accelerates uniformly from 18 km/h to 36 km/h in 5 seconds. Calculate (i) the acceleration and Hi) the distance covered by the car in that time.

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 18 km over straight h space equals space fraction numerator 18 space cross times space 1000 space straight m over denominator 3600 space straight s end fraction space equals space 5 space straight m divided by straight s F i n a l space v e l o c i t y comma space straight v space equals space 36 space km over straight h space equals space fraction numerator 36 space cross times space 1000 space straight m over denominator 3600 space straight s end fraction space equals space 10 space straight m divided by straight s T i m e space o f space t r a v e l comma space straight t space equals space 5 space straight s Acceleration comma space straight a space equals space ? space space D i s tan c e space t r a v e l l e d space b y space c a r comma space straight s space equals space ? left parenthesis straight i right parenthesis space U sin g space t h e space f i r s t space e q u a t i o n space o f space m o t i o n comma space Acceleration comma space space space straight a space equals space fraction numerator straight v minus straight u over denominator straight t end fraction space equals space fraction numerator 10 minus 5 over denominator 5 end fraction space equals space 1 space straight m divided by straight s squared left parenthesis ii right parenthesis space Distance space t r a v e l l e d space b y space t h e space c a r space i s space g i v e n space b y comma space space space space straight s space equals space ut plus 1 half at squared space space space space space space space space equals space 5 space cross times 5 space plus space 1 half cross times space 1 cross times left parenthesis 5 right parenthesis squared space space space space space space space equals space 25 space plus space 12.5 space equals space 37.5 space straight m.

Some More Questions From Matter In Our Surroundings Chapter

Convert the following temperature to Celsius scale.

573 K

Convert the following temperatures to Kelvin scale

25°C

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

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