Physics, 05.07.2019 00:20 calebvaughn924
An enclosed room with internal dimensions 4 m x 3 m x 2.4 m high is to be electrically heated to maintain the inside temperature at 25°c, when it is 5°c outside. the room has one window 1.2 m x 1.8 m and a sliding glass door 2.4 m x 2.1 m. the thermal conductivity k of each construction material is given below. walls: brick (200 mm thick) 1.00 w/(m. k) window and door: single glazed (6 mm thick) 1.40 w/(m. k) ceiling: plasterboard (13 mm thick) 0.15 w/(m. k) ignore the effects of - joins at the corners of the room, the roof above the ceiling, any furnishings, the presence of humans, orientation to the sun or any wind exposure. assume there is no heat loss through the floor and there is no requirement to initially heat the air in the room. calculate the power output of the electric heater required to maintain the specified temperature. you are required to tabulate your calculations providing one row for each part of the building's structure and use column headings of structural element, area, thermal conductivity, thickness and heat transfer rate, including suitable units. the total heat transfer rate should be provided at the bottom of the table. provide a table number and a suitable caption for your table. marks will be awarded for correct formatting.
Answers: 3
Physics, 22.06.2019 16:00, lazavionadams81
At what time will the interfering waves have an amplitudeof zero?
Answers: 1
Physics, 22.06.2019 20:10, dondre54
On a frictionless air track, a blue glider with mass 0.200 kg is moving to the right with a speed of 8.00 m/s. it strikes a red glider that has mass 0.600 kg and that is initially at rest. after the collision, the blue glider is moving to the left with a speed of 3.00 m/s.(a) what are the magnitude and direction of the velocity of the red glider after the collision? (b) is this collision elastic?
Answers: 1
An enclosed room with internal dimensions 4 m x 3 m x 2.4 m high is to be electrically heated to mai...