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During a de-orbit burn, a pre-calculatedV (delta V, change in velocity)will be used to decrease the Orion MPCV's altitude. The Orion MPCV's Orbital Maneuvering System
During a de-orbit burn, a pre-calculatedV (delta V, change in velocity)will be used to decrease the Orion MPCV's altitude. The Orion MPCV's Orbital Maneuvering System (OMS) engines provide a combinedthrust forceof 53,000 Newtons. The Orion MPCV has amassof25,848kg when fully loaded. CALCULATION: Calculate how long a de-orbit burn must last in seconds to achieve the Orion MPCV's change in altitude from 391.6 kilometers to 96.5 kilometers at perigee. Use the equations and conversions provided to find the required burn time. Equations to use: 1.Newton's Second Law:F = ma Where: a =acceleration is inmeters per second per second(ms2)units F = force is in Newtons1N=1(kgm/s^2) M =mass is in kg units Solve for a =F/m 2. Determination ofV(DeltaV): Find the change in altitude (Original Perigee - New Perigee) Use the conversion factor of(0.379[ms]/1km). This conversion factor is the approximation of orbital velocity for the altitude difference, only valid for Earth's gravity and atmospheric drag for the altitudes of this problem. Equation should read V= (Change in Altitude) x 0.379 3. Equation that defines averageacceleration, the amount by which velocity will change in a given amount of time:a = V/t 4. Rearranging the acceleration equation above to find thetime requiredfor a specific velocity change given a specific acceleration, wheret =V/a V = change in velocity in meters per second m/s a = acceleration is in meters per second per second m/s^2 t = required time in seconds (this is the value you are solving The Orion MPCV must reduce its velocity at a pre-calculated point in its orbit in order to return to Earth after its mission to the moon
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