1. A tank having a volume of 30 m 3 contains air at 400 kPa. We intend to charge this tank through a

1. A tank having a volume of 30 m3 contains air
at 400 kPa. We intend to charge this tank through a feed line having a diameter
of 4 cm and a length of 30 m. Pressurized air at 900 kPa and 15 C enters the
feed line. Find the time it takes for the tank pressure to reach 900 kPa.

2. A tank having a volume of 40 m3 contains air
at 500 kPa. We intend to charge this tank through a feed line having a diameter
of 4 cm and a length of 30 m. Pressurized air at 900 kPa and 15 C enters the
feed line. Find the tank pressure after 2 minutes. Plot the tank pressure and
the inlet mass flow rate versus time.