and r 2 from the rotational axis indicate
pressures pi and p 2 respectively (Fig. 56).
o':052 Aptitude Test Problems in Physics
Fig. 56
Determine the angular velocity co of ro-
tation of the tube, assuming that the densi-
ty pw of water is known.
1.115. Let us suppose that the drag F to the
motion of a body in some medium depends
on the velocity v of the body as F = Rya,
where o: > 0.
At what values of the exponent a, will
the body pass an infinitely large distance
after an initial momentum has been im-
parted to it?
1.116. The atmospheric pressure on Mars is
known to be equal to 1/200 of the atmospher-
ic pressure on the Earth. The diameter of
Mars is approximately equal to half the
Earth's diameter, and the densities pE and
pm of the planets are 5.5 X 10 3 kg/m 3
and 4 X 10 3 kg/m 3.
Determine the ratio of the masses of the
Martian and the Earth's atmospheres.