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Jul 05, 2018
06:20 AM

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Labels:

ACCEPTED SOLUTION

Accepted Solutions

Jul 05, 2018
09:11 AM

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Jul 05, 2018
09:11 AM

11 REPLIES 11

Jul 05, 2018
07:32 AM

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Jul 05, 2018
09:11 AM

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Jul 05, 2018
09:11 AM

Here's an alternative solution.

Worksheet in P4 format attached

Jul 09, 2018
04:16 AM

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Jul 09, 2018
06:46 AM

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Jul 09, 2018
06:46 AM

@kenan2 wrote:

Need help again......

I need solve 2 equations again

Similar to the system we solved before.

You have to solve for both unknowns.

Its sometimes necessary to set the labels for the variables by hand as Primes autolabeling very often fails.

Here is a solution without using the symbolics. We can use a numeric solve block as all the other of your variables have been assigned numeric values.

This solve block was less sensible wrt the labels of the variables.

Worksheet in MP4 format attached

Aug 07, 2018
08:37 AM

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Aug 07, 2018
09:00 AM

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Aug 07, 2018
09:00 AM

Where is the problem? I don't see your attempt solving this system.

Whenever you have two equations in two variables (here v.f and theta) you have to solve for both of them, even though you might be just interested in one.

Because of the units applied I would suggest you use a solve block as shown in one of your questions before .

The symbolics does not know anything about units and always tries to return a complete solution. So sometimes it might be necessary to tell Prime (with "assume" modifier) that m, s and kg are non-zero reals or you will have to provide a range for theta (possibly 0<theta<pi/2).

Aug 07, 2018
09:07 AM

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Aug 08, 2018
02:31 AM

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Aug 08, 2018
05:11 AM

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Aug 08, 2018
05:11 AM

Like this:

Success!

Luc

Aug 08, 2018
07:15 AM

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Aug 08, 2018
07:15 AM

Luc's answer is the same and neater.

Aug 07, 2018
10:01 AM

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Aug 07, 2018
10:01 AM