Will an ice cube wrapped in a wool blanket remain frozen for (a) less time, (b) thesame length of time, or (c) a longer time than an identical ice cube exposed to air atroom temperature?
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Will an ice cube wrapped in a wool blanket remain frozen for (a) less time, (b) the
same length of time, or (c) a longer time than an identical ice cube exposed to air at
room temperature?
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- A container of 5 L water is left out on a hot day. A temperature change of 2.5°C was noted. Estimate the heat transfer that took place. (Ignore all other heat loss)(a) Calculate the rate of heat conduction through house walls that are 13.0 cm thick and that have an average thermal conductivity twice that of glass wool. Assume there are no windows or doors. The surface area of the walls is 120 m2 and their inside surface is at 18.0ºC , while their outside surface is at 5.00ºC . (b) How many 1-kW room heaters would be needed to balance the heat transfer due to conduction?Will an ice cube wrapped in a wool blanket remain frozen for (a) a shorter length of time (b) the same length of time (c) a longer length of time than an identical ice cube exposed to air at room temperature? Explain your choice.
- (a) Normal body temperature.The average normal body temperature measured in the mouthis 310 K. What would Celsius and Fahrenheit thermometers read forthis temperature? (b) Elevated body temperature. During very vigorousexercise, the body’s temperature can go as high as 40°C. Whatwould Kelvin and Fahrenheit thermometers read for this temperature?(c) Temperature difference in the body. The surface temperature ofthe body is normally about 7 C°lower than the internal temperature.Express this temperature difference in kelvins and in Fahrenheit degrees.(d) Blood storage. Blood stored at 4.0°C lasts safely for about 3 weeks,whereas blood stored at -160 C lasts for 5 years. Express both temperatureson the Fahrenheit and Kelvin scales. (e) Heat stroke. If the body’stemperature is above 105°F for a prolonged period, heat stroke can result.Express this temperature on the Celsius and Kelvin scales.(a) You have a styrofoam container with 937 g of tomato juice (specific heat of 3,980 1/(kg- °C)) at 37.0° and you add an 80 g chunk of ice at 0°C. Assume the liquid and water mix uniformly as the ice melts and determine the final temperature of the mixture (in °C). °C (b) What If? What is the minimum mass of the ice cube (in g) that will result in a final mixture at exactly 0°C? 0The official record for the lowest temperature ever recorded on Earth was set at Vostok, Antarctica, onJuly 21, 1983. The temperature on that day fell to -89.2 °C, wellbelow the temperature of dry ice. What is this temperature indegrees Fahrenheit?
- (b) According to Newton's law of cooling, the rate at which a substance cools in moving air is proportional to the difference between the temperature of the substance and that of the air. If the temperature of the air is 30° and the substance cools from 100° to 70° in 15 minutes, find when the temperature will be 40°.a sphere emissivity = 0.42 of radius 25 cm is at 27 degrees celsius is placed in a room with a temperature of 2 degrees celsius A. what is the rate of heat energy enterinh the sphere B. How long will it take for the spiritual as 1 x 10^6 joules of energy?(a) The specific heat of copper is 92.5 Jkg-1°C¯1. A copper with mass of 250 g was heated to 100 °C. Ah Beng makes a conclusion that the copper now contains 2312500 J of heat. Point out the mistakes in this conclusion and correct them.
- Soon after the Earth formed, heat released by the decay of radioactive elements raised the average internal temperature from 300 to 3000 K, at about which value it remains today. Assuming an average coefficient of volume expansion of 3.0 x 10-5 K -1 , by how much has the radius of the Earth increased since its formation? (Let r = 6400km be the present radius of the Earth.)(a) 1.0 kg of water with initial temperature Twin = 10 °C is mixed with 5.0 kg of ice with initial temperature Tice in=-20 °C. Find the amount of ice and water and the temperature of the final state. (b) A hot air balloon raises in air and reaches a stationary height at an altitude L = 8x10 m; if the total mass of the balloon (including its load) is 130 kg, estimate (one significant digit) the total volume of the balloon (load included); (c) A chunk of solid aluminum floats in mercury; what percentage of the volume of aluminum is submerged in mercury?(a) On January 22, 1943, the temperature in Spearfish, SouthDakota, rose from -4.0°F to 45.0°F in just 2 minutes. What wasthe temperature change in Celsius degrees? (b) The temperature inBrowning, Montana, was 44.0°F on January 23, 1916. The next day thetemperature plummeted to -56°F. What was the temperature change inCelsius degrees?