1. Drops frequently form above the ocean by the mechanical disruption of waves in strong winds. How much work is required to break up 1 kg of seawater (T = 20°C, s=35 psu) into tiny drops (called spray drops), each in the form a sphere with radius 1 μm? The surface tension between seawater and air can be evaluated from σ (air-seawater) = 75.63 -0.144 T+ 0.221 s where T is in °C, s is in psu, and σis 10-3 Nm-1.

1. Drops frequently form above the ocean by the mechanical disruption of waves in strong winds. How much work is required to break up 1 kg of seawater (T = 20°C, s=35 psu) into tiny drops (called spray drops), each in the form a sphere with radius 1 μm? The surface tension between seawater and air can be evaluated from σ (air-seawater) = 75.63 -0.144 T+ 0.221 s where T is in °C, s is in psu, and σis 10-3 Nm-1.

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter15: Thermodynamics

Section: Chapter Questions

Problem 13PE: A hand—driven tire pump has a piston with a 2.50cm diameter and a maximum stroke of 30.0 cm. (a) How...

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A hand—driven tire pump has a piston with a 2.50cm diameter and a maximum stroke of 30.0 cm. (a) How much work do you do in one stroke if the average gauge pressure is 2.40105N/m2 (about 35 psi)? (b) What average force do you exert on the piston, neglecting friction and gravitational force?
Which of the assumptions below is not made in the kinetic theory of gases? (a) The number of molecules is very large. (b) The molecules obey Newtons laws of motion. (c) The forces between molecules are long range. (d) The gas is a pure substance. (e) The average separation between molecules is large compared to their dimensions. (f) of (his account are correct statements necessary for a clear and complete explanation? (ii) Which are correct statements that are not necessary to account for the higher thermometer reading? (iii) Which are incorrect statements?
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.
Consider the piston cylinder apparatus shown in Figure P20.81. The bottom of the cylinder contains 2.00 kg of water at just under 100.0c. The cylinder has a radius of r = 7.50 cm. The piston of mass m = 3.00 kg sits on the surface of the water. An electric heater in the cylinder base transfers energy into the water at a rate of 100 W. Assume the cylinder is much taller than shown in the figure, so we dont need to be concerned about the piston reaching the top of the cylinder. (a) Once the water begins boiling, how fast is the piston rising? Model the steam as an ideal gas. (b) After the water has completely turned to steam and the heater continues to transfer energy to the steam at the same rate, how fast is the piston rising?
A cylinder that has a 40.0-cm radius and is 50.0 cm deep is filled with air at 20.0C and 1.00 atm (Fig. P10.74a). A 20.0-kg piston is now lowered into the cylinder, compressing the air trapped inside as it takes equilibrium height hi (Fig. P16.74b). Finally, a 25.0-kg dog stands on the piston, further compressing the air, which remains at 20C (Fig. P16.74c). (a) How far down (h) does the piston move when the dog steps onto it? (b) To what temperature should the gas be warmed to raise the piston and dog back to hi?
9. ssm When a .22-caliber rifle is fired, the expanding gas from the burn- ing gunpowder creates a pressure behind the bullet. This pressure causes the force that pushes the bullet through the barrel. The barrel has a length of 0.61 m and an opening whose radius is 2.8 × 10-³ m. A bullet (mass = 2.6 X 10-³ kg) has a speed of 370 m/s after passing through this barrel. Ignore friction and determine the average pressure of the expand- ing gas.
27. ssm A water tower is a familiar sight in many towns. The purpose of such a tower is to provide storage capacity and to provide sufficient pres- sure in the pipes that deliver the water to customers. The drawing shows Vent- B 15.0 m Faucet 7.30 m A Faucet a spherical reservoir that contains 5.25 × 10° kg of water when full. The reservoir is vented to the atmosphere at the top. For a full reservoir, find the gauge pressure that the water has at the faucet in (a) house A and (b) house B. Ignore the diameter of the delivery pipes.
QUESTION 7 An S-590 iron component (Figure provided) must have a creep rupture lifetime of at least 20 days at 650°C (923 K). Compute the maximum allowable stress level. T(20 + log t,)(°R-h) 35 40 x103 ×103 x103 ×10³ ×103 x103 25 30 45 50 100,000 100 10,000 10 1,000 12 16 20 24 28 x103 x103 x103 x103 X103 T(20 + log t,)(K-h) Attach File Browse My Computer Browse Content Collection Stress (MPa) Stress (psi)
When a .22-caliber rifle is fired, the expanding gas from the burning gunpowder creates a pressure behind the bullet. This pressure causes the force that pushes the bullet through the barrel. Suppose the barrel has a length of 0.557 m and an opening whose radius is 2.94 x 10-3 m. A bullet (mass = 2.6 x 10-3 kg) has a speed of 467 m/s after passing through this barrel. Ignore friction and determine the average pressure of the expanding gas.
1. A rubberized sphere contains carbon dioxide. If the initial radius of the sphere is 15cm: a. How much work is done if the carbon dioxide-filled sphere expanded to five times its original volume against the pressure at STP? Express your answer in Latm. b. Upon the expansion of the sphere, what is the kinetic energy of a single carbon dioxide molecule if it travels across the diameter and covers it in 30ms? Assume that the sphere contains one mole of carbon dioxide. Express your answer in J. c. How much power can all the molecules in this sphere generate after 30s? Assume that the sphere contains one mole of carbon dioxide and that all molecules have the same kinetic energy. Express your answer in W. (Use the KE obtained from the previous required)
1. A rubberized sphere contains carbon dioxide. If the initial radius of the sphere is 15cm:a. How much work is done if the carbon dioxide-filled sphere expanded to five times its original volume against the pressure at STP? Express your answer in L atm.b. Upon the expansion of the sphere, what is the kinetic energy of a single carbon dioxide molecule if it travels across the diameter and covers it in 30ms? Assume that the sphere contains one mole of carbon dioxide. Express your answer in J.c. How much power can all the molecules in this sphere generate after 30s? Assume that the sphere contains one mole of carbon dioxide and that all molecules have the same kinetic energy. Express your answer in W. (Use the KE obtained from the previous required) Answer the letter c only . (Note that 1L atm=101.325J)
1. A rubberized sphere contains carbon dioxide. If the initial radius of the sphere is 15cm:a. How much work is done if the carbon dioxide-filled sphere expanded to five times its original volume against the pressure at STP? Express your answer in L atm.b. Upon the expansion of the sphere, what is the kinetic energy of a single carbon dioxide molecule if it travels across the diameter and covers it in 30ms? Assume that the sphere contains one mole of carbon dioxide. Express your answer in J.c. How much power can all the molecules in this sphere generate after 30s? Assume that the sphere contains one mole of carbon dioxide and that all molecules have the same kinetic energy. Express your answer in W. (Use the KE obtained from the previous required) (Note that 1L atm=101.325J)