1. the ima of the doorknob shown is .
1
0.2
6

2. what is the ima of the inclined plane shown?
6
6.75
3

3. choose the mathematical formula expressing work.

w=f x d
w=d/f
w=f/d

Explanation :

(a) The full form of IMA is Ideal Mechanical Advantage. It is given as the ratio of the radius of the wheel and the radius of the axle.

From the figure,

The radius of the wheel is 6 cm

and the radius of the axle is 1 cm.    

So, the IMA of the doorknob is 6.

(b) The IMA of the inclined plane is given by the ratio of the distance covered by the effort (L) and the distance covered by the resistance (h).

So,

So, the IMA of the inclined plane is 3.

(c) Work done is the product of the force acting and the displacement caused.

Mathematically, it can be written as :

F is applied force

d is the distance or displacement.

- lead + phosphoric acid = hydrogen + lead(ii) phosphate

when the volume of gas is   changed from   717.73 ml   to 852 ml   the temperature will   change   from 315   c to 452   c

    calculation

this is calculated using the charles law formula

that is,   v1/t1 = v2/t2

          v1=?

        t1 = 315 c   into   kelvin = 315 +273 = 588 k

        v2 = 852   ml

        t2 = 425c + 273 =698 k

make v1   the subject of the formula ( by   multiplying both side by t1)

  v1=( v2 xt1) / t2

v1= (852 ml   x 588 k)/ 698 k= 717.73 ml