Abicyclist leaves from her home at 9 a. m. and rides to a
beach40 mi away. because of a breeze off the ocean, thetemperature
at the beach remains 60 of throughout theday. at the
cyclist's home the temperature increases linearlywith time, going
from 60 of at 9 a. m. to 80of by 1 p. m. the
temperature is assumed to varylinearly as a function of position
between the cyclist's home andthe beach. determine the rate of
change of temperatureobserved by the cyclist for the following
conditions: (a) as shepedals 10 mph through a town 10 mi from her
home at 10 a. m.; (b) asshe eats lunch at a rest stop 30 mi from her
home at noon; (c)as she arrives enthusiastically at the beach at 1
p. m., pedaling 20mph.

Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.

Heat is added to a piston-cylinder device filled with 2 kg of air to raise its temperature 400 c from an initial temperature of t1 27 cand pressure of pi 1 mpa. the process is isobaric process. find a)-the final pressure p2 b)-the heat transfer to the air.

The higher the astm grain-size number, the coarser the grain is. a)-true b)-false