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10.1, thermonetry,thermal expansion and calorimetry — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics10.1, thermonetry,thermal expansion and calorimetry1 Mark
MCQ
A body of mass $5 \,kg$ falls from a height of $30$ metre. If its all mechanical energy is changed into heat, then heat produced will be........ $cal$
  • ✓
    $350$
  • B
    $150$
  • C
    $60$
  • D
    $6$
✓

Answer

Correct option: A.
$350$
a
(a) $W = JQ$ $\Rightarrow$ $mgh = J \times Q$

$\Rightarrow$ $Q = \frac{{mgh}}{J} = \frac{{5 \times 9.8 \times 30}}{{4.2}} = 350\,cal$

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