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ianhamilton_ 15 preguntas

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Preguntas del test (15)

  1. 11) Which one of the following gives the most accurate definition of a rocket?
    1. AA) Any vehicle that produces thrust by combustion of a propellant
    2. BB) Any vehicle producing thrust by acquiring mass by combustion of a propellant
    3. CC) Any vehicle which carries its own oxygen supply, but not its own fuel
    4. DD) Any vehicle producing thrust by ejecting mass, no matter what the propulsion
      technology
    5. EE) Any vehicle manufactured by NASA or ESA
  2. 22) A Saturn V rocket is sitting on its launch-pad at Cape Canaveral. It has a weight of
    2.9x107 N and has an upward thrust of 3.5x107 N. What will be its initial acceleration if it
    has mass 2.96x106
    kg?
    1. AA) 0.2 m/s2
    2. BB) 0.5 m/s2
    3. CC) 1.0 m/s2
    4. DD) 2.0 m/s2
    5. EE) 10.0 m/s2
  3. 33) Which of the follow is NOT an example of some form of a rocket?
    1. AA) Stone launched in the air
    2. BB) Chinese fire arrow
    3. CC) Balloon filled with air
    4. DD) Missile
    5. EE) Ares 1-X
  4. 44) What is the ideal mass distribution for any practical rocket to be launched into orbit
    around the earth?
    1. AA) 10% propellant, 50% tanks, engines, fins, etc., 40% payload
    2. BB) 100% propellant, 0% tanks, engines, fins, etc., 0% payload
    3. CC) 33% propellant, 33% tanks, engines, fins, etc., 33% payload
    4. DD) 11% propellant, 25% tanks, engines, fins, etc., 64% payload
    5. EE) 91% propellant, 3% tanks, engines, fins, etc., 6% payload
  5. 55) Why do most solid rockets contain a central cylindrical hollow core?
    1. AA) This increases the surface area of the burn hence enabling greater thrust
    2. BB) This is safer than a tail-burning rocket
    3. CC) This makes the rocket lighter and hence easier to get into space
    4. DD) It is difficult to engineer solid cylinders of fuel
    5. EE) Solid fuels need to "breathe" and hence must be open to the atmosphere
  6. 6Two objects, one with mass m and the other with mass 4m are situated in space. If the
    distance between the objects is 4d what is the magnitude of the force of gravitational
    attraction between the objects?

    1. A1
    2. B4
    3. C8
    4. D1/4
    5. E1/8
  7. 77) What is the main advantage of a multi-stage rocket?
    1. AA) It is easy to construct
    2. BB) It enables use of several different engines during the flight enabling greater safety
    3. CC) The ejection of stages during the flight, lightens the rocket enabling it to travel further
    4. DD) There is a rest time for each engine because they do not have to burn for the whole
      period of the flight
    5. EE) It can use either solid or liquid propellants
  8. 88) If a person has a mass of 75 kg, and the acceleration due to gravity on the moons surface
    is 1.7 m/s2. What is the weight of the person standing on the moon's surface?
    1. AA) 102.4 N
    2. BB) 102.4 kg
    3. CC) 127.5 N
    4. DD) 127.5 kg
    5. EE) 588 N
  9. 98) If a person has a mass of 75 kg, and the acceleration due to gravity on the moons surface
    is 1.7 m/s2. What is the weight of the person standing on the moon's surface?
    1. AA) 102.4 N
    2. BB) 102.4 kg
    3. CC) 127.5 N
    4. DD) 127.5 kg
    5. EE) 588 N
  10. 109) Which of the following is false?
    1. AA) A satellite is an object in orbit around a celestial body
    2. BB) The apparent weight on a artificial satellite is zero
    3. CC) Geostationary satellites orbit at a height of approximately 36000 km above the Earth’s
      surface
    4. DD) The earth’s gravitational force is generally greater for a geostationary satellite than a
      polar orbiting satellite
    5. EE) Geostationary satellites appear to hover at a point on the equator

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Test sobre Sin título, creado por ianhamilton_ el 15/01/2014.
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