Water has a density of 1.0 g/cm3 at room temperature. State whether each of the following will sink or float when placed in water. a. Paraffin wax (density 5 0.90 g/cm3) b. Limestone (density 5 2.8 g/cm3) Air has a density of 1.29 g/L at room temperature. State whether each of the following will rise or sink in air. a. Helium gas (density 5 0.18 g/L) b. Argon gas (density 5 1.78 g/L

Water has a density of 1.0 g/cm3 at room temperature. State whether each of the following will sink or float when placed in water. a. Paraffin wax (density 5 0.90 g/cm3) b. Limestone (density 5 2.8 g/cm3) Air has a density of 1.29 g/L at room temperature. State whether each of the following will rise or sink in air. a. Helium gas (density 5 0.18 g/L) b. Argon gas (density 5 1.78 g/L

Physics for Scientists and Engineers, Technology Update (No access codes included)

9th Edition

ISBN:9781305116399

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter19: Temperature

Section: Chapter Questions

Problem 19.69AP: Review. (a) Derive an expression for the buoyant force on a spherical balloon, submerged in water,...

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Review. (a) Derive an expression for the buoyant force on a spherical balloon, submerged in water, as a function of the depth h below the surface, the volume Vi of the balloon at the surface, the pressure P0 at the surface, and the density w of the water. Assume the water temperature does not change with depth, (b) Does the bouyant force increase or decrease as the balloon is submerged? (c) At what depth is the buoyant force one-half the surface value?
(a) As blood passes through the capillary bed in an organ, the capillaries join to form venules (small veins). If the blood speed increases by a factor of 4.00 and the total cross-sectional area of the venules is 10.0 cm2, what is the total cross-sectional area of the capillaries feeding these venules? (b) How many capillaries are involved if their average diameter is 10.0 m?
How many cubic meters of helium are required to lift a light balloon with a 400-kg payload to a height of 8 000 m? Take Hc = 0.179 kg/m3. Assume the balloon maintains a constant volume and the density of air decreases with the altitude z according to the expression pair = 0e-z/8 000, where z is in meters and 0 = 1.20 kg/m3 is the density of air at sea level.
(a) The density of water at 0C is very nearly 1000kg/m3 (it is actually 999.84kg/m3 ), whereas the density of ice at 0C is 917kg/m3. Calculate the pressure necessary to keep ice from expanding when it freezes, neglecting the effect such a large pressure would have on the freezing temperature. (This problem gives you only an indication of how large the forces associated with freezing water might be.) (b) What are the implications of this result for biological cells that are frozen?
A deepsea diver should breathe a gas mixture that has the same oxygen partial pressure as at sea level, where dry air contains 20.9% oxygen and has a total pressure of 1.01105N/m2. (a) What is me partial pressure of oxygen at sea level? (b) If the diver breathes a gas mixture at a pressure of 2.00106N/m2, what percent oxygen should it be to have the same oxygen partial pressure as at sea level?
4. Two gases flow into separate ducts and merge into a single duct. Gas1 has a density of 1.5 kg/m³ and flows into a duct with an area of 0.25 m2. a. If gas 2 has a density of 0.8 kg/m3 and a volume flow rate of 2.5 m/s, what is the average speed of gas 1? b. What is the speed of gas 2 if the duct it passes through has an area of 0.5 m2 c. What is the mass flow rate of the mixture?
1. What would happen to the water level in a glass if the ice cube floating in a glass of water will be completely melted? 2. A. Why does a balloon filled with helium gas rise? B. Is there a lower limit on how much helium gas it must contain before it begins to rise?
A. Calculate the time required for molecules to diffuse in a liquid a distance of 10^(−3) cm. Assume that the average velocity of the molecules is 10^4 cm/sec and that the mean free path is 10^(−8) cm. a. 10 s b. 0.1 s c. 0.01 s d. 100 s B. Repeat the calculation for the time of diffusion in letter A in a gas at 1 atm pressure, where the mean free path is 10^(−5) cm. a. 0.00001 s b. 0.001 s c. 0.01 s d. 0.0000001 s
An airplane is pressurized with air to 650 mmHg. a. If air is 21% oxygen, what is the partial pressure of oxygen on the plane? b. If the partial pressure of oxygen drops below 100 mmHg, passengers become drowsy. If this happens, oxygen masks are released. What is the total cabin pressure at which oxygen masks are dropped?
b. Determine the final units of the following expression, which provides the molecular weight of 5.3 moles of water: 5.3 moles x 18 grams/mole 7. (Oceanography) The pressure, P, exerted on an underwater object can be determined by this formula: P=pgh P is the density of water, which is 100 kg/m. g is the acceleration caused by Earth's gravity, which is 9.8 m/s. h is the depth of the object in the water in meters. 3 Determine the units of P by calculating the units resulting from the right side of the formula. Check that your answer corresponds to the units for pressure listed in Table a. 1.1. b. Determine the pressure on a submarine operating at a depth of 500 meters. 8. (Thermodynamics) The work, W, performed by a single piston in an engine can be determined by this formula: W Fd F is the force provided by the piston in Newtons. d is the distance the piston moves in meters. Determine the units of W by calculating the units resulting from the right side of the formula. Check that your…
2. A balloon with a volume of 2.0 L is filled with a gas at 3 atmospheres. If the pressure is reduced to 0.5 atmospheres without a change in temperature, what would be the volume of the balloon? 3. A gas exerts a pressure of 3 kPa on the walls of container 1. When container 1 is emptied into a 10-liter container, the pressure exerted by the gas increases to 6 kPa. Find the volume of container 1. Assume that the temperature and quantity of the gas remain constant.
A deep sea diver should breathe a gas mixture that has the same oxygen partial pressure as at sea level, where dry air contains 20.9% oxygen and has a total pressure of 1.01 ✕ 105 N/m2. a. What is the partial pressure (in N/m2) of oxygen at sea level? b. If the diver breathes a gas mixture at a pressure of 3.00 ✕ 106 N/m2, what percent oxygen should it be to have the same oxygen partial pressure as at sea level?