Mercury takes 88 days to complete an orbit around the Sun; Venus takes 225 to complete an orbit around the Sun. Which of the following might be the period of a Hohmann transfer orbit that takes you from Mercury to Venus? 140 days 450 days 225 days 88 days 44 days
Mercury takes 88 days to complete an orbit around the Sun; Venus takes 225 to complete an orbit around the Sun. Which of the following might be the period of a Hohmann transfer orbit that takes you from Mercury to Venus?
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140 days |
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450 days |
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225 days |
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88 days |
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44 days |
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A spacecraft starts out in an eastward-moving circular orbit around Jupiter. It then burns its engines and increases its speed beyond Jupiter's escape speed - and it does this while it's over Jupiter's night hemisphere. Which of the following might be its destination?
the Sun
Mars
Earth
Uranus
The chief advantage of solid rocket propellant is that
it is the cheapest type of rocket fuel
it ignites spontaneously when subject to high enough pressures
it has the greatest thrust of any rocket fuel
solid rocket engines can be shut off and turned on again
A spacecraft is moving to the east, and its nozzle is pointing to the west. If the spacecraft needs to slow down, then
it should make a 180-degree roll maneuver before it fires its main engines
it does not need to make any attitude changes before firing its main engines
it should make a 180-degree yaw maneuver before it fires its main engines
The Space-X Falcon Heavy's first payload was
a space probe going to Mars
a small electric car
a capsule carrying a human crew to the International Space Station
a communications satellite
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