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Matter In Our Surroundings

Question
CBSEENSC9005697
Wired Faculty App

Rita takes 20 minutes to cover a distance of 3.2 kilometres on a bicycle.
Calculate her velocity in units of kilometre/minute, metre/minute and kilometre/hour.

Solution
D i s t a n c e space c o v e r e d space b y space R i t a comma space space straight s space equals space 3.2 space k m space equals space 3200 space straight m space T i m e space t a k e n space t o space c o v e r space t h e space d i s t a n c e comma space straight t space equals space 20 space m i n space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space 1200 space straight s space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space 1200 over 3600 straight h space equals space 1 third straight h space left parenthesis straight i right parenthesis space V e l o c i t y comma space v space equals space straight s over straight t space equals fraction numerator 3.2 space k m over denominator 20 space m i n end fraction space equals space 0.16 space k m divided by m i n left parenthesis i i right parenthesis space V e l o c i t y comma space v space equals straight s over straight t space equals fraction numerator 3200 space k m over denominator space 20 space m i n end fraction space equals space 160 space space straight m divided by m i n left parenthesis i i i right parenthesis space V e l o c i t y comma space v equals space straight s over straight t equals fraction numerator 3.2 space k m over denominator begin display style 1 third space straight h end style end fraction space equals space 9.6 space k m divided by straight h

Some More Questions From Matter In Our Surroundings Chapter

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.

Give two reasons to justify
An iron almirah is a solid at room temperature.

Why is ice at 273K more effective in cooling than water at the same temperature ?

What produces more severe burns, boiling water or steam ?

8. Name A, B, C, D, E and F in the following diagram showing state change :

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