EXERCISE 9


A robotic spacecraft lands on Mars and collects 200 cm^3 of Martian atmosphere
in a spherical elastic container to bring back to Earth for study.  At the 
surface of Mars the pressure is 0.007 Earth atmosphere, and the typical daytime
temperature is 260 K.

(a) To reduce the size of the gas, the container is squeezed downward until
it is one-fifth its original diameter.  What is the pressure inside the
container at this reduced size?

(b) During re-entry into Earth's atmosphere, this spacecraft's temperature
is expected to reach a maximum of 700 K.  What maximum internal pressure did the
designers of this container have to account for, to keep the container from
rupturing during this time?