Answer with Explanation:
We are given that
Egood=12 V
Rbatt,good=0.02ohm
Edead=10.8 V
Rbatt,dead=0.3 ohm
We have to find the current through the batteries connected in series and parallel.
When batteries are connected in series
V=Egood+Edead=12+10.8=22.8 V
R=Rbatt,good+Rbatt,dead=0.02+0.3=0.32 ohm
Current,I=
Using the formula
When the batteries are connected in parallel
V=Egood-Edead=12-10.8=1.2 V
R=0.02+0.3=0.32 ohm
Buoyant force is equal to upthrust therefore
Upthrust = weight of brick in air - weight of brick in water
Upthrust = 26 - 11
Upthrust =15N
It's S.I unit is Newton (N) because it is a force.