Using a lever to move a rock reduces the force a person must exert . It also reduces the work (effort ) the person must do.
Using a lever decreases the input force required to lift up the load, for example if a force of 900N is required to lift the load without a lever . Using the lever the input force decreases to 500N and as we all know by the formulae of work done :
Work done ∝ force applied
By this equation we can conclude that if the force to be applied on the load reduces by the use of a lever therefore the work to be done on the load will also reduce .
You can get a additional information about the lever system below :
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Answer:
∆u =-111.8 kJ/kg
T_fin=-10.09℃
Explanation:
note:
<em>solution is attached in word file due to some technical issue in mathematical equation. please find the attached documents.</em>
He would earn $60 more dollars making it $960 for washing 30 windows this month.
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Answer: The amount of light that enters the pupil is controlled by the Iris
Explanation:
Answer:
It is also called law of Malus,the law states that the intensity of a beam of plane-polarized light after passing through a rotatable polarizer varies as square of the cosine of the angle through which the polarizer is rotated from the position that gives maximum intensity expand.
Before u can know it u have to understand it, so go through it over and over again and u will get it.
