Question

a machine has input work 100j and output work 90j what is its ifficiency​

Answer 1

Explanation:

Given equation of curve xy=1

x

dx

dy

+y=0

⇒

dx

dy

=−

x

y

Slope of tangent at P(x

1

,y

1

)=−

x

1

2

1

Slope of normal at P is =x

2

....(1)

Given equation of normal

ax+by+c=0

Slope of the normal at P is −

b

a

.....(2)

From (1) and (2),

x

2

=−

b

a

Since, x

2

>0

−

b

a

>0

⇒

b

a

<0

i.e.

b

a

should be negative.

⇒a<0,b>0 or a>0,b<0

Answer 2

Explanation:

n = MA *100

VR

n= 90*100

100

n=,90 efficient