AnswerWithUnits1

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Answer is a Number or Formula with Units

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This PG code shows how to require students to enter units with their answers.


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PG problem file Explanation

Problem tagging data

Problem tagging:

DOCUMENT(); 

loadMacros(
"PGstandard.pl",
"MathObjects.pl",
"parserNumberWithUnits.pl",
"parserFormulaWithUnits.pl",
);

TEXT(beginproblem());

Initialization: We load parserNumberWithUnits.pl and parserFormulaWithUnits.pl.

Context("Numeric")->variables->are(t=>"Real");

$h = Formula("-16 t^2 + 16");
$v = $h->D('t');
$v1 = $v->eval(t=>1);
$a = $v->D('t');

$answer[0] = FormulaWithUnits("$v","ft/s");
$answer[1] = NumberWithUnits("$v1","ft/s");
$answer[2] = FormulaWithUnits("$a","ft/s^2");

Setup: We use the differentiation operator ->D('t') and the evaluation method ->eval() to construct the derivative and evaluate it as a function. If we were writing several questions like this with different height functions, using the differentiation and evaluation methods would really speed up the writing.

Context()->texStrings;
BEGIN_TEXT
Suppose the height of a falling object, in feet
above the ground, is given by \( h(t) = $h \) 
for \( t \geq 0 \), where time is measured in 
seconds.
$BR
$BR
(a) What is the velocity of the object?  Include
units in your answer.
$BR
\{ ans_rule(20) \}
\{ helpLink("units") \}
$BR
$BR
(b) What is the velocity of the object when it
hits the ground?  Include units in your answer. 
$BR
\{ ans_rule(20) \}
\{ helpLink("units") \}
$BR
$BR
(c) What is the acceleration of the object?  
Include units in your answer. 
$BR
\{ ans_rule(20) \}
\{ helpLink("units") \}
END_TEXT
Context()->normalStrings;

Main Text: Don't forget to use helpLink("units") so your students will have access to the complete list of units that WeBWorK understands.

$showPartialCorrectAnswers = 1;

foreach my $i (0..2) {
  ANS( $answer[$i]->cmp() );
}

Answer Evaluation:

Context()->texStrings;
BEGIN_SOLUTION
Solution explanation goes here.
END_SOLUTION
Context()->normalStrings;

COMMENT('MathObject version.');

ENDDOCUMENT();

Solution:

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