The acceleration of a piston is given by : rw^2 cos(wt-pi/4) find amplitude.

Given :

The acceleration of a piston is given by :

To Find :

The amplitude of the acceleration of piston .

Solution :

Now , acceleration is :

Now , amplitude is maximum of any function .

So , maximum value of is equal to 1 .

Therefore , amplitude of the acceleration of piston is :

Hence , this is the required solution .

i think the answer is b

the current is 0.6

voltage ÷ resistance = current

so 12 ÷ 20 = 0.6