MATLAB: I need help with this exercise.

projectilevelocity

An ball is launched at a velocity (V0) of 20 m/s in a direction making an angle (θ) of 25° upward with the horizontal. Use element by element math where appropriate.

• Find the x- and y- components of the projectile velocity, V. • Find the components of the projectile position, x and y. • Assume g = 9.8 m/s2. • Calculate the above values for time from 0-1.7 seconds in increments of 0.1 second.

Vx = V0cos(θ) x = V0cos(θ)t

Vy = V0sin(θ)-gt y = V0sin(θ)t-(1/2)gt^2

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See my attached demo for a projectile that I did two years ago for my son's college physics class. It lets you specify just about every initial parameter you can think of and computes just about everything you could possibly want.

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Hello Silvia,

The input acceleration readings "acc" are actually negated in the accelerometer model before being rotated to the sensor frame by "ori" and then returned as the output "accelMeas".

As you have correctly pointed out, in order to convert "accelMeas" back to "acc", you will need to use the "rotatepoint" command and then negate the output.

This is due to linear acceleration being negative in the NED reference frame. Consider the two examples below:

Accelerometer at rest:

acc = [0 0 0] -> accelMeas = [0 0 9.81]

Accelerometer in free fall:

acc = [0 0 9.81] -> accelMeas = [0 0 0]

Thanks,

Ryan

MATLAB: Erro fprint EXERCISE VII.7 HAFFNER

While the code is completely unreadable due to the avoided formatting (did you see the "{} Code" button?), it is not needed to understand the problem. After the darn "clear all" (which has too many disadvantages to be useful), the line

saida = fopen('saida.txt','w')

fails already. Never open a file without testing the success:

[saida, msg] = fopen('saida.txt','w');
is saida == -1
  error('Cannot open file: %s', msg);
end

I guess, that you do not have write permissions in the current folder. Use cd() to change to a folder, in which you are allowed to write.

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MATLAB: IMU reference frame with respect to heading

MATLAB: Erro fprint EXERCISE VII.7 HAFFNER

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