At a fabrication plant, a hot metal forging has a mass of 75 kg and a specific heat
capacity of 430 j/(kg? c°). to harden it, the forging is immersed in 710 kg of oil that has
a temperature of 32 °c and a specific heat capacity of 2700 j/(kg? c°). the final
temperature of the oil and forging at thermal equilibrium is 47 °c. assuming that heat
flows only between the forging and the oil, determine the initial temperature of the
forging.
(5)

Avolcano erupts next to a grassland area in a valley. a. describe three ways in which material released by the volcano could impact the grassland area. b. describe three ways in which the grassland ecosystem could recover after a volcanic eruption.

Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. which one, if either is correct? a. beryl, because low thermal conductivity results in low heat transfer. b. beryl, because low thermal conductivity results in high heat transfer. d. sapphire, because low thermal conductivity results in high heat transfer. e. neither, because low heat transfer is desirable both in summer and in winter.

Suppose you plot the distance traveled by an object at various times and you discover that the graph is not a straight line. what does this indicate about the object's acceleration?