08/30

1.

What is allowed in this class?

(a)

Copying your homework from a better student.

(b)

Dropping off homework questions at the departmental office.

(c)

Giving your homework solutions to the Professor at the end of class.

(d)

Handing in homework questions in any order.

(e)

Messy homework solutions.

(f)

Working together on homework.

2.

What important contribution did De Laval make to gas dynamics? Converging-diverging duct.

3.

What did it open the door to? Supersonic exit flow/rockets/windtunnels

4.

When was the first supersonic flight? 1947

5.

By whom? Chuck Yeager

6.

Describe his or her medical problem Broken ribs.

7.

Give an expression for the speed of sound in normal air.

(a)

dx/dt

(b)

(c)

answer:

8.

Under what condition is compressibility commonly ignored for the air flow around vehicles like cars and planes? M<0.3.