Answer:
<h3>(A) The width
m</h3><h3>(B) The new width is
m</h3>
Explanation:
Given :
Focal length 
Maximum aperture 
Wavelength 
m
(A)
From rayleigh criterion,
rad
From angle formula,
Where 
12 m ( given in example )
m
m
(B)
We know that 
is proportional to the 
and inversely proportional to the 
so we write the new width, here is 5.5 times larger than above case
m
Answer:
V=IR
since the circuit is parallel both resistor have same voltage and different current value according to OHMs law.
total resistance in parallel=
1/R=1/R1+1/R2+...+1/Rn
since we have two resistor in parallel
Rt=R1R2/R1+R2
2*4/2+4=4/3 ohms
I=V/R
12/4/3=36/4=9Amp
OR
I=12/2=6amp
I=12/4=3amp
total current
I=6+3
9amp
Answer:
Friction produces unnecessary heat leading to the wastage of energy. The force of friction acts in the opposite direction of motion, so friction slows down the motion of moving objects. Forest fires are caused due to the friction between tree branches. However, friction can also cause problems in a car. Friction between moving engine parts increases their temperature and causes the parts to wear down. Friction can be both harmful and helpful, so it may be necessary to decrease or increase friction.
