Physics
posted by jake
A class of 11 students taking an exam has a power output per student of 122 W. Assume that the initial temperature of the room is 18.8oC and that its dimensions are 6.40 m by 14.5 m by 3.50 m. What is the temperature (in oC, do not enter units) of the room at the end of 54.0 min if all the heat remains in the air in the room and none is added by an outside source? The specific heat of air is 840 J/kg*oC, and its density is about 1.25E3 g/cm3
** I keep getting different answers ranging from 3040 and nothing is correct! HelP!

bobpursley
power*timeinseconds=specifheatair*densityair*volumeair(TfTi)
Tf=Ti+power*time/(specheatair*density*volume)
Tf=18.8+54*60*122/(840*6.4*14.5*3.5*density)
now change denstity to kg/m^3
density=1.25E3g/cm^3*(100cm/m)^3*1kg/1000g= 1.25E3*E6*E3=1.25kg/m^3
Tf= about one C higher. Check my calcs
Respond to this Question
Similar Questions

Teacher approach
When I entered the art room, the students were painting but there was very little studentteacher interaction. The teacher examined the students work but was not providing them with feedback. I was, in a way, disappointed at the teacher’s … 
economics
A professor of economics gives multiple choice exams each semester. He curves the exams by giving the maximum possible points to the high score on the exam. For example, if a 50 question exam is worth 100 points and the top score in … 
Physics
60) A class of 10 students taking an exam has a power output per student of about 200W. Assume the initial temperature of the room is 20 C and that its dimensions are 6.0 m by 15.0 m by 3.0 m. What is the temperature of the room at … 
Physics
A class of 11 students taking an exam has a power output per student of 124 W. Assume that the initial temperature of the room is 18.7°C and that its dimensions are 6.00 m by 14.5 m by 3.40 m. What is the temperature (in °C, do not … 
statistics and probability
It is known that an exam scores of students in STAT 2507 follow a normal distribution with a mean of 70% and a standard deviation of 9%. (A) If a student must obtain a mark of 50% to pass the exam, what proportion of students fail … 
physics
A class of 11 students taking an exam has a power output per student of 122 W. Assume that the initial temperature of the room is 18.8oC and that its dimensions are 6.40 m by 14.5 m by 3.50 m. What is the temperature of the room at … 
Math
First period: 85, 83, 74, 70, 88,95,89,72,90,83,77,91,98,89,82,84 Second period: 95,89,82,81,72,69,100,97,75,91,82,79,96,81,80,95,89,97,83,71 Mark is a student in the first period class. His score on the exam was 95%. Zoe is a student … 
JAVA PROGRAMMING
im new to java and this is my first assignment can anyone help me solving it: compile the class final grades, based on the students’ scores obtained in the classwork, midterm, and final exams. According to the course syllabus, the … 
math
a student’s grade in a class is simply the mean of five 100point exams a. If the student has grades of 77, 73, 97, and 89 on the first four exams, what is the students’ grade before taking the last exam? 
English
There are 7 classes for first year students. Each class is composed of about 30 students. Emily is a student of Class 12. One of his classmates who went to the same elementary school asks: Which class are you in?