Question

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Which of the following is a feature of science of rational mechanics ?
1,
(1) Use of lever
(2) Study of living beings
(3) Cooking food
(4) Study of human behaviour
PT​

Answer 1

Answer:

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Explanation:

use of lever = Image result for Use of lever

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Lever

Levers can be used to exert a large force over a small distance at one end by exerting only a small force(effort) over a greater distance at the other.

Classification Simple machine

Components fulcrum or

Answer 2

(1) Use of lever is the correct answer.

1. Biology is the study of living beings that deals with all the life forms.
2. Psychology is the study of human behaviour along with human emotion and cognition.
3. Cooking of food in general term refers to applying heat to food. Thus it has nothing to with rotation mechanics.
4. Movement of lever arm is perpendicular to the distance from centre of rotation, therefore, rotational mechanics can be applied on lever.