Of A black body radiates heat energy at rate of 1.0×105 joule per second. per meters at the temperatione of 127 °C. Calculate temperature of the black body the at which the is 16.0 X 105 rate of heat radiation foule per second per meter 2
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- How much energy is needed (in Joules) to convert 9.6 kg of ice at -31° C to water at 84°C? Specific heat of water, Cwater = 4186 J/kg-C°, Latent heat of fusion of ice, LF = 3.33 X105 J/kg, specific heat of ice, cice = 2090 J/kg-C°A physicist makes a cup of instant coffee and notices that, as the coffee cools, its level drops 3.00 mm in the glass cup. Show that this decrease cannot be due to thermal contraction by calculating the decrease in level if the 350cm3 of coffee is in a 7.00-cm-diameter cup and decreases in temperature from 95.0ºC to 45.0ºC. (Most of the drop in level is actually due to escaping bubbles of air.)Newton’s law of cooling states that the rate at which a body cools is proportional tothe difference between the temperature of the body and that of the medium in which itis situated. A body of temperature 70oF is placed at time t = 0 in a medium thetemperature of which is maintained at 40 oF. At the end of 3 min, the body has cooled to a temperature of 50oF. a) What is the temperature of the body at the end of 10 minutes?b) When will the temperature of the body be 30oF?
- If the net thermal energy absorbed by a steel strut is 40320 joule, find its mass in kilogram if the change in temperature is 50OCAt what net rate does heat radiate from a 263-m2 black roof on a night when the roof’s temperature is 19.47ºC and the surrounding temperature is 39.77 ºC? The emissivity of the roof is 0.867. Round your answer to 0 decimal places.Shot on vivo S1 AI Triple Camera 2021.04.15 11:38 (a) if we have a bay with Temperature. is increased upto 4sc ms there will of the bar be a crack at the centes of the bay and it moves In upuard. direction. The. Cofficent of lineal exponsion. 25x 10-6/C then. Find from the of the nor mal Pasition bar ?
- Question 5 2 points Save Assume that the total surface area of a person's body is 1.9 m and his skin temprature is 10.5 °C (Assume his body acts as black body) . If the temprature of surrounding is 38.4 °C, what is his net rate of heat loss by radiation? (Answer in one decimal places) A Click Suubmit to complete this assessment. QuesticCharlie wants to know the mass of his copper statue of Isaac Newton, but he doesn't have a scale. So, he heats up the statue to 97.0° C and plunges it into a tank of cold water (50 kg) at a temperature of 6.00° C. He notices that the water temperature rises to 9.00° C. What must be the mass of the statue? (Ignore the heat absorption of the water tank.) Specific heat of water: cwater = 4186 J/kg-°C Specific heat of copper: copper = 387 J/kg-°C) A door of a room, constructed on the top of the hill, has an area of 1.50 m2 with a thickness of 8 cm. when the sunlight falls on the door then due to heat current of 38437.5 watt, though the door, the temperature of the room increases from 30 C0 to 40 C0. Find out through calculation and table below, that what material is used for the door?
- A physicist makes a cup of instant coffee and notices that, as the coffee cools, its level drops 3.00 mm in the glass cup. Show that this decrease cannot be due to thermal contraction by calculating the decrease in level if the 350 cm3of coffee is in a 7.00-cm-diameter cup and decreases in temperature from 95.0ºC to 45.0ºC. (Most of the drop in level is actually due to escaping bubbles of air.)why is the answer positive if the change in temperature is negative (initially at 100C then went down to 34C) isnt change in temperature Tf-Ti, so it would be 34-100 =-66C? also energy is being transferred out so wouldnt the answer be -6910 insteadThere are 4 people in an Igloo (half shpere) with an r of 2.4m and each person emits 120 watts of heat. How thick must the igloo walls be to maintain an inside tmep of 10C if outside temp is -17.8C. (Heat is only lost in this problem through conduction) k of ice blocks is 0.32j/smC. Assume no heat is lost throught the ground Cross section area of sphere 2pi(r)^2