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Standard XII

Physics

Conservative and Non Conservative Forces

For the path ...

Question

For the path PQR in a conservative force field, the amount of work done in carrying a body from P to Q & from Q to R are $5$ J & $2$ J respectively. The work done in carrying the body from P to R will be?

7

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3

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\sqrt{21}

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Zero

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Solution

The correct option is A $7$ J
Workdone in closed path is zero.
$W_{P t o Q} + W_{Q t o R} + W_{R t o P} = 0$

$2 + 5 + W_{R t o P} = 0 W_{R t o P}$

$W_{R t o P} = - 7$

$W_{P t o R} = - W_{R t o P} = - (- 7) = 7 J$

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Similar questions

Q. For the path

P Q R

in a conservative force field, the amount of work done in carrying a body from

P

Q

& from

Q

R

are

5 J

2 J

respectively. The work done in carrying the body from

P

R

will be-

Q. For the path

P Q R

in a conservative force field (figure), the amount of work done in carrying a body from

P

Q

& from

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are

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respectively. The work done in carrying the body from

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will be

Q. The work done in carrying the body from

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20 J

and from

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C

15 J

. The work done in moving the body from

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assuming the force involved in all the cases is conservative force is:

A body of mass 1 kg is taken from infinity to a point P. when the body reaches that point,it has a speed of 2m/s. the work done by conservative force is -5J. which of the following is true(assuming non-conservative and pseudo-forces to be absent).

a) work done by applied force is +7J.

b)the total energy possessed by the body at P is +7J

c)The potential energy possessed by the bodyat P is +5J

d) work done by all foeces together is equal to the change in KE.

Q. A body is displaced from position

A

to position

B

. Kinetic and potential energies of the body at positions

A

and

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are

K_{A} = 70 J, U_{A} = - 50 J, K_{B} = - 20 J

and

U_{B} = 30 J

. Then:

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For the path PQR in a conservative force field, the amount of work done in carrying a body from P to Q & from Q to R are 5J & 2J respectively. The work done in carrying the body from P to R will be?

The correct option is A 7JWorkdone in closed path is zero.WPtoQ+WQtoR+WRtoP=02+5+WRtoP=0WRtoPWRtoP=−7WPtoR=−WRtoP=−(−7)=7J

For the path PQR in a conservative force field, the amount of work done in carrying a body from P to Q & from Q to R are $5$ J & $2$ J respectively. The work done in carrying the body from P to R will be?

The correct option is A $7$ J
Workdone in closed path is zero.
$W_{P t o Q} + W_{Q t o R} + W_{R t o P} = 0$

$2 + 5 + W_{R t o P} = 0 W_{R t o P}$

$W_{R t o P} = - 7$

$W_{P t o R} = - W_{R t o P} = - (- 7) = 7 J$