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St. Vincent College PH 171 Exam I - Physics and Rocket Science, Exams of Physics

Cochin University of Science and TechnologyPhysics

A past exam from st. Vincent college's ph 171: it’s not rocket science course, dated september 27, 2006. The exam consists of six problems covering various topics in physics and rocket science. Problems include calculating the average thrust of a rocket motor, identifying the components of a chemical reaction, and determining whether a rocket is classified as a model rocket.

Typology: Exams

2012/2013

Uploaded on 02/21/2013

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St. Vincent College
PH 171: It’s Not Rocket Science
Exam I
9/27/2006
The exam consists of 6 questions. The questions may not be worth the same number of points, read
the entire exam before beginning work. Put your name on all pages.
Problem 1 15
Problem 2 20
Problem 3 10
Problem 4 20
Problem 5 20
Problem 6 15
Total 100
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St. Vincent College PH 171: It’s Not Rocket Science

Exam I

The exam consists of 6 questions. The questions may not be worth the same number of points, read the entire exam before beginning work. Put your name on all pages.

Problem 1 15

Problem 2 20 Problem 3 10 Problem 4 20

Problem 5 20 Problem 6 15

Total 100

  1. (15 pts) It is a simple modification to put a 24 mm diameter motor mount in an Estes Baby Bertha rather than the 18 mm diameter mount that comes with the kit. This allows use of substantially larger motors, such as the Aerotech F24.

a) If 1 lb = 4.448 N, list the average thrust of the F24 rocket motor in both Newtons and pounds.

b) If a Baby Bertha has a mass of 44.5 g when ready to launch (but without the motor installed) and the F24 has a total mass of 62.2 g before firing (including propellant and casing), what is the weight of the rocket and motor together (in pounds)? Note that 1 kg of mass has a weight of 9.8 N on earth.

c) The F24 motor has a total impulse of 50 N·s and propellant mass of 19 g. Is the Baby Bertha, flown with an F24, legally classified as a “model rocket”?

  1. (10 pts) The BATF argues that the common and usual purpose of ammonium perchlorate composite propellant (APCP) is to function by exploding and thus should be regulated as an explosive. This is the solid propellant used in both larger hobby rocket motors and the space shuttle solid rocket boosters.

Decide whether or not you agree with this position. Explain briefly why you agree or disagree, making mention of any evidence you can in support of your opinion.

  1. (20 pts)

a) What must happen to a solid fuel before it can combust. You may use combustion of any solid fuel as an example, including candle wax, the solid fuel in a hybrid rocket motor, or even the solid propellant in a solid rocket motor.

b) What are some things you can do to stop a combustion reaction?

  1. (15 pts) “For every action there’s an equal and opposite reaction,” says the commonly quoted version of Newton’s 3rd Law. What is the actual “action” that produces a forward force on a functioning rocket motor?