The diagram below is just a help.
please help me with that task.

The adjacent circuit with an ohmic resistor and a temperature-dependent resistor is used for temperature detection. Thermistors are conductive materials that have a higher conductivity at high temperatures than at low temperatures. This means that their electrical resistance decreases with increasing temperature.

#1 Calculate the voltage U20 if a temperature of 20 degrees Celsius is measured at the temperature-dependent resistor!

#2 Calculate the temperature of the thermistor with an open circuit voltage U20 = 3.2 V at the temperature-dependent resistor!

thank you.

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?

Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?

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