I can't work out how to use my calculator pleae help exam sunday

AI Thread Summary
The user is struggling to use their Texas Inspire CX and another calculator for trigonometry questions ahead of an exam. They have been following a formula from their university textbook but consistently arrive at incorrect answers. A key suggestion was to ensure the calculator is set to degrees instead of radians, which resolved the issue for the user. The discussion highlights the importance of calculator settings in solving trigonometric problems effectively. Proper configuration can lead to accurate results in exam preparation.
Pete789
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1. I have two calculators. including the Texas inspire cx. I can't make either of them work reliably on trig questions. I have an exam sunday and i need to be sure how to use my inspire.
2. Summation: [50][0.5] + [50][0.07cos35] + [100][0.1cos35] = 13.55
3. Now i got this formula off my uni textbook. However, i consistently get the wrong answer. The internet and the book that came with my inspire are useless.

Anyone with an inspire or casio fx82au.. please help

Pete
 
Last edited:
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If you are using degrees in your trig formulas, make sure the calculator is set to degrees rather than radians.
 
Yep right, got it thanks Steamking. Now it works

Peter
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
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