Along, uninsulated steam line with a diameter of 100 mm and a surface emissivity of 0.8 transports steam at 150°c and is exposed to atmospheric air and large surroundings at an equivalent temperature of 20°c. (a) calculate the rate of heat loss per unit length for a calm day. (b) calculate the rate of heat loss on a breezy day when the wind speed is 8 m/s. (c) for the conditions of part (a), calculate the rate of heat loss with a 20-mm-thick layer of insulation (k = 0.08 w/m ⋅ k). would the heat loss change significantly with an appreciable wind speed?

The energy released by a chemical reaction can be measured using a calorimeter. when barium hydroxide octahydrate crystals are reacted with dry ammonium chloride inside of a coffee cup calorimeter, the temperature of the 18.00 g of water in the calorimeter decreases from 30.0°c to 8.0°c. the equation for calculating energy absorbed or released by a reaction is: where q is the energy released or absorbed, m is the mass of water in the calorimeter, cp is the specific heat of water, and δt is the observed temperature change. if the specific heat of liquid water is 4.19 j/g·°c, how much energy was absorbed by the reaction?

Which statement is best supported by the information in the chart? wave y is moving the fastest. wave x is moving the fastest. all of the waves are moving at the same speed. all of the waves have the same value of wavelengths per second.

Question 11 of 13 (1 point) jump to question: a stairway, ladder, or ramp must be present in excavations in which of the following situations? a. all trenches must have access/egress b. the trench is more than 15 feet wide but only 1 ½ feet deep c. the trench is more than 4 feet deep and the devices must be within 25 feet of all workers