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Finding the speed to orbit Deimos

Thread starter aron silvester
Start date Oct 24, 2017
Tags

Orbit Speed

1 reply · 1K views · last reply Oct 24, 2017

aron silvester

Thread starter
Oct 24, 2017

#1

Homework Statement

They stated in the problem that the radius is 6.3. Why did they multiply it by 10^3 during the calculation?

Textbook worked example 6.14 finding the orbital speed around Deimos: computing surface gravity as GM/R^2 giving 0.0030 m/s^2, then orbital speed v = sqrt(gr) = 4.3 m/s, about 10 mph.

Homework Equations

It's in part 1 and 3.

The Attempt at a Solution

Handwritten derivation of orbital speed around Deimos: v_orbit = sqrt(gr), g = GM/R^2 with G = 6.67 x 10^-11 N·m^2/kg^2, M = 1.8 x 10^15 kg, R = 6.3 x 10^3 m, giving g = 0.0030 m/s^2 and v_orbit = 4.3 m/s, approximately 10 mph.

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Discussion

TSny

Science Advisor

Homework Helper

Gold Member

Oct 24, 2017

#2

What are the units that go with the 6.3 stated in the problem? What are the units of length contained in the units for G?

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