A worker uses a crowbar to move a boulder of weight 100 kg wt. If the length of the crowbar is 2 m and the effort arm is 0.3 m, then write the following steps in sequential order to find the effort needed to be applied.
(A) Find the load, effort arm, and length of the crowbar from the given data.
(B) Use the principle of the lever, i.e., load × load arm = effort × effort arm.
(C) Here, load arm = length of a crowbar – length of effort arm.
(D) Substitute the values in the above formula and find the effort required.

ACBD

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ABDC

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CDAB

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CBDA

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Solution

The correct option is A
ACBD

For finding the effort needed to be applied first of all we have to find the data from the question regarding the load, effort arm, and length of the crowbar. Load = 100 kg wt. Length of the crowbar = 2 m, Length of the effort arm = 0.3 m.
According to the question, the length of the load arm will be the length of a crowbar – the length of the effort arm.
Length of the load arm = 2 m - 0.3 m = 1.7 m
Now we will apply the principle of the lever $L o a d \times L o a d a r m = E f f o r t \times E f f o r t a r m$
Now put the respective values $100 \times 1.7 = E f f o r t \times 0.3$
We get $E f f o r t = \frac{1700}{3} k g w t$
Hence the correct option is (A) ACBD

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