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AP Physics 2
9.5 Specific Heat and Thermal Conductivity
9.3 Thermal Energy Transfer and Equilibrium
BeginnerMCQGraphicalMathematicalConceptual23.5k
A quantitative line graph plotting Temperature T in degrees Celsius on the vertical axis against Heat Added Q in kilojoules on the horizontal axis. The vertical axis ranges from 0 to 100 degrees Celsius with labeled tick marks at 0, 20, 40, 60, 80, and 100. The horizontal axis ranges from 0 to 200 kilojoules with labeled tick marks at 0, 40, 80, 120, 160, and 200. A continuous solid line consists of three segments: a line segment starting at point (0, 20) and ending at point (40, 80), a horizontal segment extending from point (40, 80) to point (160, 80), and a line segment rising from point (160, 80) to point (200, 100). Dotted vertical construction lines extend down to the horizontal axis from points (40, 80) and (160, 80). No other labels, lines, text, or axes appear.
Temperature of a 0.50 kg sample as a function of heat added.
A \(0.50 \text{ kg}\) sample of an unknown pure substance, initially in the solid phase at \(20^\circ\text{C}\), is heated at a constant rate in an insulated container. The graph shows the temperature \(T\) of the sample as a function of the heat added \(Q\). Based on the graph, what is the latent heat of fusion of the substance?

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