Concept explainers
(II) A pressure cooker is a sealed pot designed to cook food with the steam produced by boiling water somewhat above 100°C. The pressure cooker in Fig. 18–17 uses a weight of mass m to allow steam to escape at a certain pressure through a small hole (diameter d) in the cooker’s lid. If d = 3.0 mm, what should m be in order to cook food at 120°C? Assume that atmospheric pressure outside the cooker is 1.01 × 105 Pa.
Want to see the full answer?
Check out a sample textbook solutionChapter 18 Solutions
Modified Mastering Physics with Pearson eText -- Combo Access -- for Physics for Scientist and Engineers (18 week)
Additional Science Textbook Solutions
Conceptual Physical Science (6th Edition)
College Physics: A Strategic Approach (4th Edition)
Essential University Physics (3rd Edition)
University Physics Volume 1
The Cosmic Perspective (8th Edition)
Physics for Scientists and Engineers: A Strategic Approach, Vol. 1 (Chs 1-21) (4th Edition)
- An airtight dispenser for drinking water is 25 cm × 10 cm in horizontal dimensions and 20 cm tall. It has a tap of negligible volume that opens at the level of the bottom of the dispenser. Initially, it contains Water to a level 3.0 cm from the top and air at the ambient pressure, 1.00 atm, from there to the top. When the tap is opened, water will flow out until the gauge pressure at the bottom of dispenser, and thus at the opening of the tap, is 0. What volume of water flows out? Assume the temperature is constant, the dispenser is perfectly rigid, and the water has a constant density of 1000 kg/m3.arrow_forwardMost cars have a coolant reservoir to catch radiator fluid that may overflow when the engine is hot. A radiator is made of copper and is filled to its 16.0-L capacity when at 10.0 . What volume of radiator fluid will overflow when the radiator and fluid reach a temperature of 95.0 , given that the fluid's volume coefficient of expansion is =400106/C? (Your answer will be a conservative estimate, as most car radiators have operating temperatures greater than 95.0 ).arrow_forwardIn a common demonstration, a bottle is heated and stoppered with a hard-boiled egg that's a little bigger than the bottle's neck. When the bottle is cooled, the pressure difference between inside and outside forces the egg into the bottle. Suppose the bottle has a volume of 0.500 L and the temperature inside it is raised to 80.0 while the pressure remains constant at 1.00 atm because the bottle is open. (a) How many moles of air are inside? (b) Now the egg is put in place, sealing the bottle. What is the gauge pressure inside after the air cools back to the ambient temperature of 25 but before the egg is forced into the bottle ?arrow_forward
- The excess internal energy of metabolism is exhausted through a variety of channels, such as through radiation and evaporation of perspiration. Consider another pathway for energy loss: moisture in exhaled breath. Suppose you breathe out 22.0 breaths per minute, each with a volume of 0.600 L. Suppose also that you inhale dry air and exhale air at 37C containing water vapor with a vapor pressure of 3.20 kPa. The vapor comes from the evaporation of liquid water in your body. Model the water vapor as an ideal gas. Assume its latent heat of evaporation at 37C is the same as its heat of vaporization at 100.C. Calculate the rate at which you lose energy by exhaling humid air.arrow_forward(I) What is the air pressure at a place where water boils at80°C?arrow_forward(II) A tire is filled with air at 15°C to a gauge pressure of230 kPa. If the tire reaches a temperature of 38°C, whatfraction of the original air must be removed if the originalpressure of 230 kPa is to be maintained?arrow_forward
- (I) (a) “Room temperature” is often taken to be 68°F. Whatis this on the Celsius scale? (b) The temperature of the filament in a lightbulb is about 1900°C. What is this on the Fahrenheit scale?arrow_forward(II) A storage tank at STP contains 28.5 kg of nitrogen (N2)(a) What is the volume of the tank? (b) What is the pressure if an additional 32.2 kg of nitrogen is added withoutchanging the temperature?arrow_forward(II) The lowest pressure attainable using the best availablevacuum techniques is about 10-12 N/m2 At such a pressure,how many molecules are there per cm3 at 0°C?arrow_forward
- (II) The rms speed of molecules in a gas at 20.0°C is to beincreased by 4.0%. To what temperature must it be raised?arrow_forward. (III) Air that is at its dew point of 5°C is drawn into abuilding where it is heated to 22°C. What will be the relativehumidity at this temperature? Assume constant pressureof 1.0 atm. Take into account the expansion of the air.arrow_forward(II) It is observed that 55.50 mL of water at 20°C completelyfills a container to the brim. When the container and thewater are heated to 60°C, 0.35 g of water is lost. (a) Whatis the coefficient of volume expansion of the container?(b) What is the most likely material of the container?Density of water at 60°C is 0.98324 g/mLarrow_forward
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage LearningCollege PhysicsPhysicsISBN:9781285737027Author:Raymond A. Serway, Chris VuillePublisher:Cengage Learning