y the second law of dynamics the impulse of a force
applied. to a givenbodyequals the changeintlle body's momen
tum, Denoting the force acting on the pig by F, and the pig's
velocitybyu,weshallhave:
=
F X 0⋅01 dyn/sec 5000 vgem/sec..
For the pig to overtake its own squeal, it must move with a
velocitygreater.than.the velocity ofsound, i.e.. umustbe greater
than 330 mjsec. Therefore
I
F 5000 X 33,000 dyn
> 0-01
or
F > 5000 X 33,000 kgwt,
0⋅01 X 980 X 1000
F> 16,500 kgwt.. approx.