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Q. The concrete wall of a building is 0.10m thick. The temperature inside the building is 20.0 °C, while the temperature outside is 0°C. Heat is conducted through the wall. When the building is unheated, the inside temperature falls to 0°C, and heat conduction ceases. However, the wall does emit radiant energy when its temperature is 0°C. The radiant energy emitted per second per square meter is the same as the heat lost per second per square meter due to conduction. What is the emissivity of the wall?
Two crates, of mass 75 kg and 105 kg, are in contact and at rest on a horizontal surface. A 732 N force is exerted on the 75.00 kg crate.
A parallel-plate air-filled capacitor having area 44.0 cm2 and plate spacing 2.80 mm is charged to a potential difference of 620. V.
How rapidly atom are assembled in this protein synthesis
Some athletes can put out as much as 800 watts in short bursts. If you could sustain such energy output long enough to reach the top of a mountain, how much time would it take you to get there from the valley, 3000 meters below the peak? So how does ..
Refrigerant-134a enters a compressor at 180 kPa as a saturated vapour with a flow rate of 0.35 m3/min and leaves at 700 kPa. The power supplied to the refrigerant during compression process is 2.35 kW. What is the temperature R-134a at the exit of th..
If the mass of both weights is 150 gm, the first mass is located 30 north of east, the second mass is located 30 south of east, and the transducer sensitivity is 0.5 volts/Newton, how large a voltage do you expect to measure? Suppose the transducer h..
A gas increases in pressure from 2.0 atm to 6.0 atm at a constant volume of 1.0 m3 and then expands at constant pressure to a volume of 3.0 m3 before returning to its initial state. How much work is completed in one cycle.
They then turn together around the spindle with their centers superposed. What is an angular frequency in of the combination.
What is the final angular velocity
What is the distance delta y between the two points that you observe? suppose that the plates have length d , and use e and m for the charge and the mass of the electrons, respectively.
Calculate charges, current, potential difference.
What lengths of ship three sides according to the observer
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