(A) Power is defined as the rate of doing work,calculated as $P = F \times v$,where $F$ is the force and $v$ is the velocity.For Avinash:$P_{A} = F_{A

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Avinash,because his power is $80 \, W$.

(A) Power is defined as the rate of doing work,calculated as $P = F \times v$,where $F$ is the force and $v$ is the velocity.For Avinash:$P_{A} = F_{A} \times v_{A} = 10 \, N \times 8 \, m \, s^{-1} = 80 \, W$.For Kapil:$P_{K} = F_{K} \times v_{K} = 25 \, N \times 3 \, m \, s^{-1} = 75 \, W$.Comparing the two,$80 \, W > 75 \, W$. Therefore,Avinash is more powerful than Kapil.

Class 9 Science WORK AND ENERGY Mix Example - WORK AND ENERGY

Medium

Avinash can run with a speed of $8 \, m \, s^{-1}$ against a frictional force of $10 \, N$,and Kapil can move with a speed of $3 \, m \, s^{-1}$ against a frictional force of $25 \, N$. Who is more powerful and why?

A
Avinash,because his power is $80 \, W$.
B
Kapil,because his power is $75 \, W$.
C
Both are equally powerful.
D
None of the above.

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WORK AND ENERGY

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Mix Example - WORK AND ENERGY

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Avinash can run with a speed of $8 \, m \, s^{-1}$ against a frictional force of $10 \, N$,and Kapil can move with a speed of $3 \, m \, s^{-1}$ against a frictional force of $25 \, N$. Who is more powerful and why?

Similar Questions

Water stored in a dam possesses

What is the work done by the tension in the string of a simple pendulum?

State whether the following statement is true or false:In order to get minimum work,the angle between force and displacement should be $90^{\circ}$.

$(a)$ Define power. Give its $SI$ unit.$(b)$ Taking the example of a simple pendulum, explain the variations in the forms of energy and the interconversions involved.

$A$ block of mass $5 \,kg$ is lying on a frictionless table. $A$ force of $20 \,N$ is applied on it for $10 \,s$. Calculate its kinetic energy. (in $J$)

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State whether the following statement is true or false:
In order to get minimum work,the angle between force and displacement should be $90^{\circ}$.

$(a)$ Define power. Give its $SI$ unit.
$(b)$ Taking the example of a simple pendulum, explain the variations in the forms of energy and the interconversions involved.