Students heat a sample of water with a electric heater for

PHYSICS · Single correct · A Level · Physics · Further mechanics and thermal physics · Further mechanics and thermal physics

Problem

Students heat a

0.25\,\text{kg}

sample of water with a

150\,\text{W}

electric heater for

200\,\text{s}

. The temperature of the water rises by

25^{\circ}\text{C}

. What is the percent error of the students’ experimentally determined specific heat compared with the accepted value of

4.18\times10^{3}\,\text{J}\,(\text{kg}\cdot\text{K})^{-1}

? (a)

21\%

(b)

5.9\%

(c)

15\%

(d)

12\%