Physics, 24.06.2019 09:50 dmsmith192
Consider a thin circular disk that has been heated up to 100 °c and then left inside a chamber to cool down. the chamber surface is kept at 50 °c and the air inside is maintained at 20 °c. assume that the disk is held at the center of the chamber and the heat conduction is neglectable. what is the total rate of heat transfer from the disk? the disk diameter is 500 mm and the surface emissivity is ε = 0.5. note: air properties: υ = 20.92×10-6 m2 /s, k = 30×10-3 w/mk, pr = 0.7, α = 29.9×10-6 m2 /s and
Answers: 1
Physics, 22.06.2019 03:50
A30 kg weight lies on top of a massless piston of area a = 0.01 m2 the exterior air is at a (constant) p =1 atm and t = 27 c. the interior gas is 0.4 moles of (ideal) n2 and it has initial temperature 27.00 degrees c. 1. what is the initial pressure in the interior? a. 29.4 kpa b. 130.7 kpa c. 101.3 kpa the next three questions concern what happens when an amount of heat q is slowly added to the interior, raising the piston by 1 mm and raising the interior temperature to 27.40 c
Answers: 3
Physics, 22.06.2019 05:30
James is trying to prove newton's 2nd law of motion. he tries to move four different objects with different masses, shapes, and sizes from point a to point b. the objects are a toy car, a car, a refrigerator, and a kitchen table. after some experimentation, he finds that force is dependent on the mass of the object, rather than it's size or shape. the object that takes the most force to move is the
Answers: 1
Physics, 22.06.2019 09:30
Astone is dropped from a cliff and falls 9.44 meters. what is the speed of the stone when it reaches the ground? a. 13.6 m/sec b. 1.39 m/sec c. 185 m/sec d. 9.80 m/sec
Answers: 3
Consider a thin circular disk that has been heated up to 100 °c and then left inside a chamber to co...
Chemistry, 05.02.2021 02:50
Mathematics, 05.02.2021 02:50
Mathematics, 05.02.2021 02:50
Mathematics, 05.02.2021 02:50
Mathematics, 05.02.2021 02:50
Geography, 05.02.2021 02:50
Mathematics, 05.02.2021 02:50
French, 05.02.2021 02:50
Mathematics, 05.02.2021 02:50