Question

please answer these and please make it clear for my understanding

thank you very much in advance

1. Explain how momentum is the key to rocket succes 2. To put a one tonne satellite in to low earth orbit requires a delta v of around 10 km per second from the launch pad. Explain what this means and why a velocity of this magnitude is required. 3. How much kinetic energy will this satellite have in orbit? Compare that with the KE of a family car (of the same mass) KE driving at 100 km per hour. 4. The rocket that launches this satellite burns fuel which releases 42.8 MJ joules per kg of combusted material. What mass of fuel is needed for lifting the satellite's mass to orbit? 5. Explain why more fuel is needed than in question 4 for a real launch system. (overcoming air resistance is only a small part of this additional energy need) Early liquid-fuelled rockets, such as the V2, buned ethanol and liquid oxygen as their propellant gases 6. Write the ethanol-water combustion chemical reaction 7. Which reactant is oxidised and which is reduced? 8. Explain how the state of matter of the products is important to the rocket's succesS Apollo moon missions required the Command Module (CM) to orbit around the moon at around 200km above the surface, whilst the Lunar Excursion Module visited the surface itself. 9 to enter lunar orbit the CM and LEM, which were still joined at that point, performed a lunar insertion burn. This is classified as retrograde. Explain the meaning of this term and why it was needed. In your answer refer to delta v and gravitational potential wells.

Answer 1

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