Question

Q.9 Two wires are made up of same material and have same volume. The crossectional area of wire 1 is A and that of second wire is 4*A. If length of wire 1 increases by ΔL by applying force F, how much force is needed to stretch wire 2 by the same amount ? irc uuag urx​

Answer 1

Answer:

First we solve 5x+4y≥20

Let first draw graph of

x 0 4

y 5 0

5x+4y=20 ___(1)

Putting x=0 in (1)

5(0)+4y=20

0+4y=20

4y=20

y=

4

20

y=5

Putting y=0 in (1)

5x+4(0)=20

5x+0=20

5x=20

x=

5

20

x=4

Drawing graph

x 0 4

y 5 0

Points to be plotted are (0,5),(4,0)

Checking for (0,0)

5x+4y≤20

Putting x=0,y=0

5(0)+4(0)≤20

0≤20

Which is true

Hence origin lies in plane 5x+4y≤20

So, we shade left side of line

REF. IMAGE 1

Also, y≥2

So, for all values of

x,where y=2

x 0 −1 4

y 2 2 2

Points to be plotted are (0,2),(−1,2),(4,2)

Also, x≥1

So, for all values of y,where x=1

x 1 1 1

y 0 −1 3

Point to be plotted are (1,0),(1,−1),(1,3)

Hence the shaded region represents the given in equalit