Maurice Tutor

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Expertise:
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Teaching Since: May 2017
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  • MCS,PHD
    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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  • Professor
    Phoniex University
    Oct-2001 - Nov-2016

Category > Management Posted 06 Nov 2017 My Price 9.00

Sojourner rover vehicle

The Sojourner rover vehicle shown in the sketch above was used to explore the surface of Mars as part of
the Pathfinder mission in 1997. Use the data in the tables below to answer the questions that follow.
Mars Data
Radius: 0.53 x Earth's radius Mass of Sojourner vehicle: 11.5 kg
Sojourner Data
Mass: 0.11 x Earth's mass Wheel diameter: 0.13 m
Stored energy available: 5.4 x 105
Power required for driving
J
under average conditions: 10 W
Land speed: 6.7 x 10-3 m/s
a. Determine the acceleration due to gravity at the surface of Mars in terms of g, the acceleration due to gravity at
the surface of Earth.
b. Calculate Sojourner's weight on the surface of Mars.
c. Assume that when leaving the Pathfinder spacecraft Sojourner rolls down a ramp inclined at 20° to the
horizontal. The ramp must be lightweight but strong enough to support Sojourner. Calculate the minimum
normal force that must be supplied by the ramp.
d. What is the net force on Sojourner as it travels across the Martian surface at constant velocity? Justify your
answer.
e. Determine the maximum distance that Sojourner can travel on a horizontal Martian surface using its stored
energy.
f. Suppose that 0.010% of the power for driving is expended against atmospheric drag as Sojourner travels on the
Martian surface. Calculate the magnitude of the drag force.

Answers

Maurice Tutor
(5)
Status NEW Posted 06 Nov 2017 09:11 PM My Price 9.00

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