Exercise Formulas and Constants

Question 1

What is the formula for the rocket equation?

Answer 1

delta v = v_e ln (m_o/m_f)

Question 2

What is the effective exhaust velocity for hydrolox thruster?

Answer 2

4.5 km/s

Question 3

What is the effective exhaust velocity for methalox thrusters?

Answer 3

3.6 km/s

Question 4

What is the delta v requirement of LEO?

Answer 4

9.3-10

Question 5

What is atmospheric pressure?

Answer 5

101325 Pa

Question 6

What is the formula for absorbed Solar Radiation?

Answer 6

Q_solar = A_cross-section * alpha * I_solar

Question 7

What is the value of I_solar? (solar constant)

Answer 7

1361 W/m^2

Question 8

What is the formula for an object in thermal equilibrium?

Answer 8

T = [ (Q_total) / (A *F * Epsilon * Sigma ) ] ^1/4

Question 9

What is the value of the Stefan Boltzmann constant?

Answer 9

5.67 * 10^-8 W/m^2 K^4

Question 10

What is the formula for Fitting Power Law Data to Curve?

Answer 10

Y= A + bX

where:
- X = ln x
- Y = ln y
- A = ln a
- b = sum [(X - bar X)(Y - bar Y)] / sum (X - bar X)^2

Question 11

What is the formula for hydrogen reduction of ilmenite?

Answer 11

FeTiO_3 + H_2 <–> Fe + TiO_2 + H_2O

Question 12

What is the formula for Electrolysis of Water?

Answer 12

H_2O <–> H_2 + 0.5 O_2

Question 13

What is wt% mean?

Answer 13

Weight Percentage

Question 14

What is the formula to determine minimum thermodynamic potential for an Electrolysis Reaction?

Answer 14

E = triangle G / (z * F)

Question 15

What is the formula for Power consumed by electrolysis?

Answer 15

Energy = Pt = EIt where E = (required potential + overpotential)