The distance–time graph for a girl on a cycle ride is shown in Figure 1.2.14.
a Calculate
i how far the girl travelled

When does your body conduct current more readily?

Consider a 1000 w iron whose base plate is made of 0.5 cm thick aluminum alloy 2024-t6 (ρ = 2770 kg/m3 and cp = 875 j/kg°c). the base plate has a surface area of 0.03 m2. initially, the iron is in thermal equilibrium with the ambient air at 22°c. assuming 90% of the heat generated in the resistance wires is transferred to the plate, determine the minimum time needed for the plate temperature to reach 200°c.

Explain why you think this diagram shows what happened to the carbon in the biodome.