Advertisements
Advertisements
Question
Can you find the diameter of a thin wire of length 2 m using the ruler from your instrument box?
Advertisements
Solution
Yes, first you have to wound the wire around the scale for 10 cm and count the number of turns in it. Then if you divide 10 cm by number of turns which gives the thickness of the wire.
APPEARS IN
RELATED QUESTIONS
Just as precise measurements are necessary in science, it is equally important to be able to make rough estimates of quantities using rudimentary ideas and common observations. Think of ways by which you can estimate the following (where an estimate is difficult to obtain, try to get an upper bound on the quantity):-
the number of air molecules in your classroom.
Match the following.
| 1. | Length | kelvin |
| 2. | Mass | metre |
| 3. | Time | kilogram |
| 4. | Temperature | second |
Which line is longer? C or D? Measure each line. How good is your guess?
What is the length of a 100 rupee note? Guess. Now measure it using a scale.
Measure the yellow rectangle. It is ________ cm long.
Arbaz plans to tile his kitchen floor with green square tiles. Each side of the tile is 10 cm. His kitchen is 220 cm in length and 180 cm wide. How many tiles will he need?
There are two beautiful lakes near a village. People come for boating and picnics in both the lakes. The village Panchayat is worried that with the noise of the boats the birds will stop coming. The Panchayat wants motorboats in only one lake. The other lake will be saved for the birds to make their nests.
- What is the length of the boundary of lake B in the drawing?
The SI unit of mass is kg.
To measure the distance of a planet from the earth, ______ method is used.
If a planet subtends an angle α at distance D, what formula is used to find the planet's diameter?
