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Oksanka [162]
3 years ago
10

If we changed our speed limit signs to metric, what would probably replace 55 mi/h? (please round your answer to the nearest 1 k

m/h.)
Physics
1 answer:
Anit [1.1K]3 years ago
7 0
55 miles/ hour

1 mile = 1.609 kilometers

So ..................>>> 55 (1.609) [km/h] = 88.495 km/h

Rounding the answer....>>> 88 km/h
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3688 km/h

Explanation:

Given:-

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What is the speed of the command module relative to Earth just after the separation?

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             Initial momentum = Final momentum

                                       Pi = Pf

                  M*vs_e = m*vc_e + 4m*vm_e

Where,

                  M = m + 4m = 5m

                  vc_e = Velocity of command relative to earth

                  vm_e = Velocity of motor relative to earth  

- We will develop a relation of velocities of command and motor in the frame of earth as follows:

                  vm_e =  v_c/m + vc_e        

- Substituting (vm_e) from Equation 2 into Equation 1, we have:

                  5m*vs_e = m*vc_e + 4m*(v_c/m + vc_e)

                  5m*vs_e = 5m*vc_e + 4m*(v_c/m)

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                   vs_e - 0.8*(v_c/m) = vc_e

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                  vc_e = 3760 - 0.8*(90)

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Answer:

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