Concept explainers
You are watching a new bridge being built near your house. You notice during the construction that two concrete spans of the bridge of total length Li = 250 m are placed end to end so that no room is allowed for expansion (Fig. P18.11a). In the opening storyline for this chapter, we talked about buckling sidewalks. The same thing will happen with spans on bridges if allowance is not made for expansion (Fig. P18.11b). You want to warn the construction crew about this dangerous situation, so you calculate the height y to which the spans will rise when they buckle in response to a temperature increase of ΔT = 20.0°C.
Figure P18.11
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Chapter 19 Solutions
Physics for Scientists and Engineers, Technology Update, Hybrid Edition (with Enhanced WebAssign Multi-Term LOE Printed Access Card for Physics)
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- A gas is in a container of volume V0 at pressure P0. It is being pumped out of the container by a piston pump. Each stroke of the piston removes a volume Vs through valve A and then pushes the air out through valve B as shown in Figure P19.74. Derive an expression that relates the pressure Pn of the remaining gas to the number of strokes n that have been applied to the container. FIGURE P19.74arrow_forwardA 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 1.50 ✕ 106 N/m2, what percent oxygen should it be to have the same oxygen partial pressure as at sea level?arrow_forwardA flanged bolt coupling consists of ten steel 1/2-in.-diameter bolts spaced evenly around a bolt circle 14 in. in diameter. Determine the torque capacity of the coupling if the allowable shearing in the bolts is 6000 psi.arrow_forward
- The internal air pressure of a fridge reduces after closing its door due to cooling of air. If the temperature of all the trapped air falls from 30 deg Celcius to 5.0 deg Celcius after closing the fridge door, what is the magnitude of the resulting net force on the door? Take the volume of trapped air to be 0.30 m3, take the fridge to be perfectly sealed, and take the door area that is in contact with the trapped air to be 0.60 m2?arrow_forward1.88 moles of an ideal gas are placed in a container whose volume is 4.88 x10−3 m3. The absolute pressure of the gas is 6.3 x105 Pa. What is the average translational kinetic energy of a molecule of the gas?arrow_forwardAtmospheric pressure atop Mt. Everest is 4 2 3.30x10 N/m . (a) What is the partial pressure of oxygen there if it is 20.9% of the air? (b) What percent oxygen should a mountain climber breathe so that its partial pressure is the same as at sea level, where atmospheric pressure is 1.01 × 10^5 N/m^2 ?arrow_forward
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