Hp 39g Graphing Calculator Uživatelský manuál stáhnout pdf (Strana 92)

Plotting to find guesses

The main reason for plotting in the Solve aplet is to help you

find initial guesses and solutions for those equations that have

difficult-to-find or multiple solutions.

Consider the equation of motion for an accelerating body:

-V = Vnf +

where ,v is distance, vq is initial velocity, t is time, and a is

acceleration. This is actually tn’o equations, y = x and

y = Vq t + (aP) / 2.

Since this equation is quadratic for t, there can be both a

positive and a negative solution. However, we are concerned

only with positive solutions, since only positive di.stance

makes sense.

1. Select the Solve aplet and enter the equation.

I APLET I Select Solve HEU

I alphaIXB

fALPHAlV [xllALPHAlT

[+11 alpha] A

[x](alpha]T[x5]02

:dlve svmmlic viehs

■PEliX=V*T+fl*TgA2

E3:

E4:

E5:

jgtniBimi

■ WilililljtW

Find the solution for T (time) when A=30, V=2, and

A=4. Enter the values for X, V, and A; then highlight the

independent variable, T.

NUM

30 I ENTER I

2 I ENTER I

[T|4 I ENTER I

py] fvl to highlight T

sSOLVE NUMEiilC VIEWS

ENTER VmUE Oli PRESS SOLVE

_______

Solve aplet

1 2 ... 87 88 89 90 91 92 93 94 95 96 97 ... 291 292

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Hp 39g Graphing Calculator Uživatelský manuál Strana 92