Question

A student measures the length of the pencil using a broken ruler. The
image shows the measurement by the broken ruler. The student made an
error and records the length of the pencil as 7 cm. How can this error be
removed?​

Answer 1

Answer:

this error can be removed by taking the measurement from 2cm and to now see where it ends .

it's actual measure is 2cm to 7cm = 7cm- 2cm = 5cm( ans)

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Answer 2

Answer:

The error is removed by changing the initial point value of the ruler.

Explanation:

• The length is equal to the size of the object from one end to the other.
• Meter, centimeters, millimeters, and kilometers are the units of measuring length.
• Screw gauge, vernier caliper, and rulers are used generally to measure length.

We can calculate length using a ruler correctly by:

$Total$ $Length$ $= Vf-Vi$

where, $Vf$ is the endpoint mark value.

            $Vi$ is the initial point mark value.

Step 1:

Here, the student is using a broken ruler so, the initial point mark value is not equal to zero. So, there is an error in the length recorded.

Step 2:

We will make the adjustment that the initial point mark value is now  $1.2$ not zero. So, $Vi=1.2$ .

As we know that  $Vf=7$.

So, the correct length is $=7-1.2$  $cm$

                                        $=5.8$  $cm$

Hence, the correct adjustment is by changing the initial point value of the ruler.