Two 400W fans are switched on in a perfectly-insulated, closed room at atmospheric pressure and a temperature of 18°C. If the fans operate continuously and the room is 5m x 6m with 3.5m high ceiling. Assuming that the specific gas constant and specific heat capacity of air at a constant volume are 287 J/kg.K and 717 J/kg.K respectively: (a) Calculate the temperature of the air in the room after 2 hours, stating all of the assumptions made. (b) What would be the temperature of the room if there was a heat loss through the walls of 750 W throughout the two hours?

Two 400W fans are switched on in a perfectly-insulated, closed room at atmospheric pressure and a temperature of 18°C. If the fans operate continuously and the room is 5m x 6m with 3.5m high ceiling. Assuming that the specific gas constant and specific heat capacity of air at a constant volume are 287 J/kg.K and 717 J/kg.K respectively: (a) Calculate the temperature of the air in the room after 2 hours, stating all of the assumptions made. (b) What would be the temperature of the room if there was a heat loss through the walls of 750 W throughout the two hours?

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

Calculate the force (P) required to move the 80 Kg blockshown in figure up the inclined plane.
2: The lecturer Aous used to drive his car early inorder to arrive and teach his students some engineering subjects in Tikrit University because he lives in Baghdad. The distance between the above two cities (Tikrit and Baghdad) is 160 km, and he always drive in average velocity which is about 75 mile per hour. Determine the time that he should start driving from Baghdad if you know that the first lecture begins at 8:30 a.m Hint: one mile is almost equal to 1.6 km
QUIZ. Solve the problem stated below. Use bond papers and black ball pen (sign pen). Make your solution clear and clean. Draw the Figure. PROBLEMS 1. A baseball is thrown vertically upward from the ground and reached the height of 40 meters. Determine the time required for the baseball hits the ground.
Problem 21 E-35 Lbs a 1.25 feet A-4.5 feet Calculate R Calculate MA
If area of the cylinder increases,the pressure of the cylinder given from pump could be more. Select one: True False
Identify if the statement is true or false. Choose from the given conditions on the choices below. Please explain. I. For an object submerged in y distance from the water level, as y increases, the pressure experienced by the object decreases.II. The same object placed in containers with three different areas submerging by the same depth will have a varying pressure depending on the containers. a. Both statements are true b. Both statements are false c. Statement I is true, the latter being false d. Statement I is false, the latter being true
Textbook 10.45. If an astronaut and her space suit weigh 250 lb on Earth, what should be the volume of her suit if she is to practice for weightless conditions in an underwater neutral buoyant simulator similar to the one used by NASA shown in Chapter 7.
Company manufactures four types of furniture A, super A, B, super B. Furniture A requires (12 ft') of wood and requires (10 ft) of wood. Wood cost is (13 Dinar per one ft). Wood available is (40000 ft). It takes (4 hours) to manufacture A and (2 hours) to manufacture B. More (2.5 hours) need to change A into super A and more (3 hours) to change B into super B. A total of (5000 hours) are available. All furniture can be sold at the following price; A for 90 Dinar, super A 120 Dinar, B for 50 Dinar and super A for 70 Dinar. Formulate an LPM will maximize the profit from manufacturing these four furniture.
1. Which of the following statement/s is/are incorrect? a. For uniform body, the center of gravity and centroids acts on the same point. b. In equilibrium, The net moment of force at the centroids is zero. c. The moment of inertia is directly proportional to the distance from the neutral axis. d. The center of gravity is always at the geometric center of the body. 2. Which of the following is an accurate statement? a. Reaction due to roller support have rotation motion only b. In rotational equilibrium, the net moment of force is not equal to zero. c. Reaction due to hinged support have normal force only. d. A static structure have a net force of zero.
Assignment No: 2 Mechanics 1st grade PROBLEMS 1 - Find the distance ( Y ) if the moment of the forces system shown in fig. is equal to ( 12750 N.m) about the point (0) 500 N T 70 m 30°/ 120 N 2 - The moment of a certain force (F) is ( 180 N.m ) clockwise about (o) and ( 90 N . m) counterclockwise about ( B ) , if it's moment about (A) is zero , Determine the force ? OA 3 m 6 m 6N 3 - Forces of ( 4N & 6 N ) act on the lamina ABCD as shown in fig . Find the total moments of these forces about the point (0). 3m 5m 4N 250 N 15 4 - Calculate the moment of the -200 mm ( 300 N) force on the handle of the monkey wrench about the center of the bolt. 30 mm F60N 5 - A force F of magnitude 60 N is applied to the gear Determine the moment of F about point o. 100 O O D
Which car seats are appropriate for a 30-lb child? Select all that apply. A. The third car seat. B. The second car seat. C. The first car seat.
Q3: Explane in which case Fa has a maximum Value & minimum Value in Puling the car shown in Fig