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Matter In Our Surroundings

Question
CBSEENSC9006326
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A force of 20 N displaces an object through 10 cm and does 10 J work in the process. Find the angle between force and displacement.

Solution

Given comma space Force comma space straight F space equals space 20 space straight N Distance space travelled comma space straight s space equals space 10 space cm space equals space 0.10 space straight m comma Work space done comma space straight W space equals 1 space straight J Angle space between space force space and space displacement comma space straight theta space equals space ? using space the space formula comma space space space space space space straight W space equals space Fs space cos space straight theta therefore space 1 space equals space 20 space cross times space 0.10 space cross times space cos space straight theta space rightwards double arrow space cos space straight theta space equals space 1 half Hence comma space space space space straight theta space equals space 60 degree. space space

Some More Questions From Matter In Our Surroundings Chapter

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.

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 ?

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