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# Tutor profile: Nick J.

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Nick J.
Control Systems Engineer with Experience in Engineering Math and Physics
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## Questions

### Subject:Physics (Newtonian Mechanics)

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Question:

Describe/define Newton's first law of motion and explain how it applies to vehicles in space.

Inactive
Nick J.

Newton's first law of motion says that in the absence of forces, every body has uniform motion in a constant direction at a constant speed. As it applies to space vehicles, if a vehicle (body) is in space such that any gravitational force is negligible and there are no other forces acting on the vehicle (wind drag, friction, etc.), then the vehicle will continue "drifting" in the directed it started with at a constant velocity.

### Subject:MATLAB

TutorMe
Question:

Compute the mean value of the columns and the rows for the following array without using any loops for computations. A = [0.8147, 0.6324, 0.9575, 0.9572; 0.9058, 0.0975, 0.9649, 0.4854; 0.1270, 0.2785, 0.1576, 0.8003; 0.9134, 0.5469, 0.9706, 0.1419]

Inactive
Nick J.

One solution of code is below with the answer following % column means mean(A,1) = 0.6902 0.3888 0.7627 0.5962 % row means mean(A,2) = 0.8404 0.6134 0.3408 0.6432

### Subject:Calculus

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Question:

Let f(x) = 1/(1+x). Compute f^(7) (1) (the 7th derivative of x=1.

Inactive
Nick J.

f^(1) = -1/(x+1)^2 f^(2) = 2/(x+1)^3 f^(3) = -6/(x+1)^4 f^(4) = 24/(x+1)^5 f^(5) = -120/(x+1)^6 f^(6) = 720/(x+1)^7 f^(7) = -5040/(x+1)^8 -> f^(7) (1) = -315/16

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