A 175 g lump of molten lead at its melting point (327° C) is placed into 55.0 g of water at 20.0°C. The specific heat of
lead is 130J/kg°C and the Hf of lead is 20,400 J/kg. When
the lead has become solid but is still at the melting point, what
is the temperature of the water?

Assume that a person skiing high in the mountains at an altitude of h = 15100 ft takes in the same volume of air with each breath as she does while walking at sea level. determine the ratio of the mass of oxygen inhaled for each breath at this high altitude compared to that at sea level. assume that the air composition (i.e. % of air that is oxygen) is the same at sea level as it is at 15100 ft.

The sound level near a noisy air conditioner is 70 db. if two such units operate side by side, the sound level near the, would bea. 70dbb. 73 dbc. 105 dbd 140 db

Explain what will happen if decomposers were apsent from a forest ecoysystem.