Physics
JAMB 1985
Two thermo flasks of volume Vx and Vy are filled with liquid water at an initial temperature of 0
oC. After sometime the temperature were found to be 9x, 9y, respectively. Given that \(\frac{Vx}{Vy}\) = 2 and \(\frac{\theta x}{\theta y}\) = \(\frac{1}{2}\) the ratio of the heat flow into the flask is
-
A.
\(\frac{1}{4}\)
-
B.
\(\frac{1}{2}\)
-
C.
4
-
D.
1
-
E.
2
Correct Answer: Option D
Explanation
Heat = mc\(\theta\)
Hx = Dx x Vx x Cx x \(\theta\)x
Hy = Dy x Vy x Cy x \(\theta\)y
\(\frac{H_x}{H_y}\) = \(\frac{D_x \times V_x \times C_x \times \theta_x}{D_x \times V_x \times C_x \times \theta_x}\)
= 2 x \(\frac{1}{2}\)
= 1
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