A wall has inner and outer surface temperatures of 25◦C and 8◦C, respectively. The interior and exterior air temperatures are 35◦C and −3 ◦C, respectively. The inner and outer convection heat transfer coefficients are 6 W/m2 ·K and 10 W/m2 ·K, respectively. Calculate and state the direction of the heat flux between (a) the interior air and the wall, and (b) the exterior air and the wall. (c) Is the wall under steady-state conditions? State your reasoning
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Physics, 21.06.2019 22:00, Brandon4188
If the speed of a particle triples ,by what factor does its kinetic energy increase?
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An engineer designs a roller coaster so that a car travels horizontally for 152 ft, then climbs 137 ft at an angle of 34.0° above the horizontal. it then moves 137 ft at an angle of 48.0° below the horizontal. if we take the initial horizontal motion of the car to be along the +x-axis, what is the car's displacement? (give the magnitude of your answer, in ft, to at least four significant figures and give the direction of your answer in degrees counterclockwise from the +x-axis.)
Answers: 1
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Mutt and jeff are running along a path each pushing a cart loaded with rocks. if mutt's wagon has a mass two times greater than jeff's and they want to stay together, arriving at their destination at the same time, what must happen? a) jeff should slow down so mutt can catch up. b) mutt must use half as much force to push his cart. c) mutt must use twice as much force to push his cart. d) mutt and jeff will use the same force, but mutt will take bigger steps.
Answers: 1
A wall has inner and outer surface temperatures of 25◦C and 8◦C, respectively. The interior and exte...
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