BIO A Thermodynamic Process in an Insect. The African bombardier beetle ( Stenaptinus insignis ) can emit a jet of defensive spray from the movable tip of its abdomen ( Fig. P 17.91 ). The beetle’s body has reservoirs containing two chemicals; when the beetle is disturbed, these chemicals combine in a reaction chamber, producing a compound that is warmed from 20°C to 100°C by the heat of reaction. The high pressure produced allows the compound to be sprayed out at speeds up to 19 m/s (68 km/h), scaring away predators of all kinds. (The beetle shown in Fig. P17.91 is 2 cm long.) Calculate the heat of reaction of the two chemicals (in J/kg). Assume that the specific heat of the chemicals and of the spray is the same as that of water, 4.19 × 10 3 J/kg · K, and that the initial temperature of the chemicals is 20°C. Figure P17.91
BIO A Thermodynamic Process in an Insect. The African bombardier beetle ( Stenaptinus insignis ) can emit a jet of defensive spray from the movable tip of its abdomen ( Fig. P 17.91 ). The beetle’s body has reservoirs containing two chemicals; when the beetle is disturbed, these chemicals combine in a reaction chamber, producing a compound that is warmed from 20°C to 100°C by the heat of reaction. The high pressure produced allows the compound to be sprayed out at speeds up to 19 m/s (68 km/h), scaring away predators of all kinds. (The beetle shown in Fig. P17.91 is 2 cm long.) Calculate the heat of reaction of the two chemicals (in J/kg). Assume that the specific heat of the chemicals and of the spray is the same as that of water, 4.19 × 10 3 J/kg · K, and that the initial temperature of the chemicals is 20°C. Figure P17.91
BIO A Thermodynamic Process in an Insect. The African bombardier beetle (Stenaptinus insignis) can emit a jet of defensive spray from the movable tip of its abdomen (Fig. P 17.91). The beetle’s body has reservoirs containing two chemicals; when the beetle is disturbed, these chemicals combine in a reaction chamber, producing a compound that is warmed from 20°C to 100°C by the heat of reaction. The high pressure produced allows the compound to be sprayed out at speeds up to 19 m/s (68 km/h), scaring away predators of all kinds. (The beetle shown in Fig. P17.91 is 2 cm long.) Calculate the heat of reaction of the two chemicals (in J/kg). Assume that the specific heat of the chemicals and of the spray is the same as that of water, 4.19 × 103 J/kg · K, and that the initial temperature of the chemicals is 20°C.
Figure P17.91
Science that deals with the amount of energy transferred from one equilibrium state to another equilibrium state.
An automobile wheel contains air with a pressure of 3x10^5 Pa at 25 C. The sipop cover was removed and the air was allowed to expand adiabatically against an external pressure of 10^5 Pa. What is the final temperature of the gas in the wheel? (It should be taken into account that the gas behaves ideally
and the Cp value for air is 7/2R)
Does the temperature of an ideal gas increase, decrease, or stay the same during (a) an isothermal expansion, (b) an expansion at constant pressure, (c) an adiabatic expansion, and (d) an increase in pressure at constant volume?
A monatomic ideal gas undergoes an isothermal expansion at 300K, as the volume increased from 4x10−2−2m33 to 0.16m33. The final pressure is 150kPa. The ideal gas constant is R=8.314J/mol K. What is the heat transfer to the gas closest to?
Chapter 17 Solutions
Mastering Physics with Pearson eText -- Standalone Access Card -- for University Physics with Modern Physics (14th Edition)
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