Suppose you take and hold a deep breath on a chilly day, inhaling 1.8 L of air at 0∘C. Assume that air pressure is 1.0 atm. Part A How much heat must your body supply to warm the air to your internal body temperature of 37∘C? Assume that for air Cp = 29.1 J/(K⋅mol) as […]
If a person has a dangerously high fever, submerging her in ice water is a bad idea, but an ice pack can help to quickly bring her body temperature down. Part A How many grams of ice at 0∘C will be melted in bringing down a 65 kg patient’s fever from 40∘C to 39∘C? Express […]
Part A What minimum heat is needed to bring 50 g of water at 50 ∘C to the boiling point and completely boil it away? The specific heat of water is 4190 J/(kg⋅K) and its heat of vaporization is 22.6×105 J/kg. Express your answer to two significant figures and include the appropriate units.
When air is inhaled, it quickly becomes saturated with water vapor as it passes through the moist upper airways. When breathing dry air, about 25 mg of water are exhaled with each breath. At 12 breaths per minute, what is the rate of energy loss due to evaporation? At body temperature, the heat of vaporization […]
Older railroad tracks in the U.S. are made of 12 m-long pieces of steel. When the tracks are laid, gaps are left between the sections to prevent buckling when the steel thermally expands. Part A If a track is laid at 16∘C, how large should the gaps be if the track is not to buckle […]
A weather balloon rises through the atmosphere, its volume expanding from 4.0 m3 to 11 m3 as the temperature drops from 23 ∘C to -14 ∘C. Part A If the initial gas pressure inside the balloon is 1.0 atm, what is the final pressure? Express your answer using two significant figures.
Total lung capacity of a typical adult is approximately 5.0 L. Approximately 20% of the air is oxygen. Part A At sea level and at an average body temperature of 37∘C, how many moles of oxygen do the lungs contain at the end of an inflation? Express your answer using two significant figures.
A gas is compressed by an adiabatic process that decreases its volume by a factor of 2. Part A In this process, the pressure increases by a factor of 2. increases by a factor of less than 2. does not change. increases by a factor of more than 2.
In some expensive cookware, the pot is made of copper but the handle is made of stainless steel. Part A Explain why this is so. Drag the terms on the left to the appropriate blanks on the right to complete the sentences.
A standard mercury thermometer consists of a hollow glass cylinder, the stem, attached to a bulb filled with mercury. As the temperature of the thermometer changes, the mercury expands (or contracts) and the height of the mercury column in the stem changes. Marks are made on the stem to denote the height of the mercury […]