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Standard XII

Physics

Problem Solving

Question 11Av...

Question

Question 11
Avinash can run with a speed of $8 m s^{- 1}$ against the frictional force of $10 N$ , and Kapil can move with a speed of $3 m s^{- 1}$ against the frictional force of $25 N$ . Who is more powerful and why?

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Solution

$P o w e r = \frac{W o r k d o n e}{T i m e} = \frac{F o r c e \times d i s t a n c e}{T i m e} = F o r c e \times V e l o c i t y$
$\Rightarrow$ $P = F \times v$
Power of Avinash $= P_{A} = F_{A} \times v_{A} = 10 \times 8 = 80 W$
Power of Kapil $= P_{K} = F_{K} \times v_{K} = 25 \times 3 = 75 W$
So, Avinash is more powerful than Kapil.

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Similar questions

Question 11
Avinash can run with a speed of $8 m s^{- 1}$ against the frictional force of $10 N$ , and Kapil can move with a speed of $3 m s^{- 1}$ against the frictional force of $25 N$ . Who is more powerful and why?

Q. Avinash can run with a speed of

8

m s^{- 1}

against the frictional force of

10

N

, and Kapil can move with a speed of

3

m s^{- 1}

against the frictional force of

25

N

. Who is more powerful?

Q. Avinash can run with a speed of

8 m s^{- 1}

against the frictional force of 10 N, and Kapil can move with a speed of

3 m s^{- 1}

against the frictional force of 25 N. Who is more powerful?

Q. An elevator can carry a maximum load of

1800 k g (e l e v a t o r + p a s s e n g e r s)

is moving up with a constant speed of

2 m s^{- 1}

. The frictional force opposing the motion is

4000 N

. What is minimum power delivered by the motor to the elevator?

Q. An elevator in a building can carry a maximum of

10

persons, with the average mass of each person being

68 kg

. The mass of the elevator itself is

920 kg

and it moves with a constant speed of

3 {ms}^{- 1}

. The frictional force opposing the motion is

6000 N

. If the elevator is moving up with its full capacity, the power delivered by the motor to the elevator

(g = 10 {ms}^{- 2})

must be at least

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Problem Solving

Standard XII Physics

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Question 11 Avinash can run with a speed of 8 ms−1 against the frictional force of 10 N, and Kapil can move with a speed of 3 ms−1 against the frictional force of 25 N. Who is more powerful and why?

Power=Work doneTime=Force×distanceTime=Force×Velocity ⇒P=F×v Power of Avinash =PA=FA×vA=10×8=80 W Power of Kapil =PK=FK×vK=25×3=75 W So, Avinash is more powerful than Kapil.

Question 11
Avinash can run with a speed of $8 m s^{- 1}$ against the frictional force of $10 N$ , and Kapil can move with a speed of $3 m s^{- 1}$ against the frictional force of $25 N$ . Who is more powerful and why?