Exhaust gases from a wire processing oven are discharged into a tall stack, and the gas and stack surface temperatures at the outlet of the stack must be estimated. knowledge of the outlet gas temperature tm o is useful for predicting the dispersion of effluents in the thermal plume, while knowledge of the outlet stack surface temperature ts'0 indicates whether condensation of the gas products will occur. the thin-walled, cylindrical stack is 0.5 m in diameter and 5 m high. the exhaust gas flow rate is 0.5 kg/s, and the inlet temperature is 500 degree c. the ambient air temperature is 4 degree c. calculations that are a little beyond where we are now in tf1 show that the average surface heat transfer coefficient in the outside surface is h0= 14 w/m2 k, and the inside heat transfer coefficient is hi= 10 w/m2 k. the thermal resistance of the stack wall itself may easily be neglected. estimate the outlet gas and stack surface temperatures for the given conditions.

Scout feels ill one day before school. her mother puts a thermometer in her mouth and the temperature begins to climb to 100°f. what is happening between the cooler thermometer and scout's body? a) scout's body is applying a force to the particles in the thermometer. b) kinetic energy is being transferred from her mouth to the thermometer. c) potential energy is being lost by the thermometer and gained by scout's body. d) the potential energy stored in foods is converted to mechanical energy to raise the mercury in the thermometer.

The frequency of vibrations of a vibrating violin string is given by f = 1 2l t ρ where l is the length of the string, t is its tension, and ρ is its linear density.† (a) find the rate of change of the frequency with respect to the following. (i) the length (when t and ρ are constant) (ii) the tension (when l and ρ are constant) (iii) the linear density (when l and t are constant) (b) the pitch of a note (how high or low the note sounds) is determined by the frequency f. (the higher the frequency, the higher the pitch.) use the signs of the derivatives in part (a) to determine what happens to the pitch of a note for the following. (i) when the effective length of a string is decreased by placing a finger on the string so a shorter portion of the string vibrates df dl 0 and l is ⇒ f is ⇒ (ii) when the tension is increased by turning a tuning peg df dt 0 and t is ⇒ f is ⇒ (iii) when the linear density is increased by switching to another string df dρ 0 and ρ is ⇒ f is ⇒

A0.580-kg rock is tied to the end of a string and is swung in a circle with a radius of 0.500 meters. the velocity of the rock is 4.50 m/s. what is the centripetal force acting on the rock? 15.5 n 5.22 n 69.8 n 23.5 n