Suppose object A<span> is a cue ball and object </span>B<span> is an eight ball on a pool table. If the cue ball strikes the eight ball, the cue ball exerts a force on the eight ball that sends it rolling toward the pocket. At the same time, the eight ball exerts an equal and opposite force on the cue ball that brings it to a stop. Note that both the cue ball and the eight ball each experience a change in momentum. However, the sum of the momentum of the cue ball and the momentum of the eight ball remains constant throughout.</span>
Since the density of the substance is ρ (rho),
==> every cm³ of this substance has ρ grams of mass.
Then
==> V cm³ of it has ρV grams of mass. That's ' m '.
and
==> 3V cm³ of it has 3ρV grams of mass. That's ' <em>3m</em> '.
Answer:
e). The ratio is not given
Explanation:
<u>Capacitance of a capacitor</u>
The expression for the capacitance of a capacitor with di electric material is given as
C=KεA/d
where
ε=permittivity of di electric
C= capacitance in farads
A= Area of plate
d= separating distance
K= dielectric constant
let the distance in capacitor B be 1mm
therefore the distance in A is 0.5mm
For the first (A) capacitor
C1=8εA/0.5
C1=16εA
For the Second (B) capacitor
C2=8εA/1
C2=8εA
the ratio of the capacitance of A to B
=C1/C2
=16εA/8εA
=2/1
=2
The force needed is less in water vs land because of the buoyancy in water