How much heat (in J) is needed to raise the temperature of 7 kg of copper from 32°C to 820°C?
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How much heat (in J) is needed to raise the temperature of 7 kg of copper from 32°C to 820°C?
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- Air is accelerated in a nozzle from 119 m/s and 327 °C to 334 m/s. The heat loss from the nozzle is estimated to be 17 kJ/kg. Determine the exit temperature of air in °C to 1 decimal place. Take the specific heat of air to be 1.0 kJ/(kgK).A swimming pool filled with water has dimensions of 4.76 m ✕ 10.2 m ✕ 1.70 m. Water has density ρ = 1.00 ✕ 103 kg/m3 and specific heat c = 4186 J/(Kg◦°C). Find the mass (in kg) of water in the pool. 2. Find the thermal energy (in J) required to heat the pool water from 3°C to 27.1°C. 3. Calculate the cost (in dollars) of heating the pool from 3°C to 27.1°C if electrical energy costs $0.120per kilowatt-hour.6. 11 088 J of heat energy are needed to raise the temperature of 1.6 kg of copper from 7 °C to 25 °C. Calculate the specific heat capacity of copper.
- The specific heat of a substance varies with temperature according to c = 0.24 + 0.47T+ 0.049T2, with Tin °C and c in cal/g-K. Find the energy required to raise the temperature of 7.9 g of this substance from 1.0°C to 11°C. Number UnitsAn electronics device generates 36.8 W of heat energy during normal operation. The heat is dissipated from the top surface of the device to ambient air at 23°C. If the top surface area is 0.174 m2 and the convection heat transfer coefficient is 7.365 W/m2· K, what will be the surface temperature (in °C) of the device [round your final answer to one decimal place]?The amount of heat per second conducted from the blood capillaries beneath the skin to the surface is 260 J/s. The energy is transferred a distance of 1.5 x 103 m through a body whose surface area is 1.4 m². Assuming that the thermal conductivity is that of body fat, determine the temperature difference between the capillaries and the surface of the skin.
- How much heat energy is required to raise the temperature of 0.368 kgkg of copper from 23.0 ∘C∘C to 60.0 ∘C∘C? The specific heat of copper is 0.0920 cal/(g⋅∘C)cal/(g⋅∘C) .A closed box is filled with dry ice at a temperature of -86.0 °C, while the outside temperature is 21.0 °C. The box is cubical, measuring 0.394 m on a side, and the thickness of the walls is 4.49 × 102 m. In one day, 3.76 × 106 J of heat is conducted through the six walls. Find the thermal conductivity of the material from which the box is made. Number UnitsWhen it rains, water vapor in the air condenses into liquid water, and energy is released. (a) How much energy is released when 0.0356 m (1.40 inch) of rain falls over an area of 2.59×106 m² (one square mile)? (b) If the average energy needed to heat one home for a year is 1.50x10¹1 J, how many homes could be heated for a year with the energy determined in part (a)? (a) Number i (b) Number 1 Units Units
- The number of kilocalories in food is determined by calorimetry techniques in which the food is burned and the amount of heat transfer is measured. How many kilocalories per gram are there in a 9.56-g pistachio if the energy from burning it is transferred to 0.540 kg of water held in a 0.116-kg aluminum cup, causing a 57.7°C temperature increase? (You do not need to enter any units.) kcal/g Submit Answer Tries 0/10 Part B If a serving of pistachio consists of 16.0-g, how many kcal is consumed per serving? (Note: Food packaging energy content is labeled as "Cal" which is equivalent to "kcal".) (You do not need to enter any units.) kcal Submit Answer Tries 0/10How much energy is required to change a 31 g ice cube from ice at -11 °C to steam at 112°C? The specific heat of ice is 2090 J/kg °C, the specific heat of water is 4186 J/kg °C and the specific heat of steam is 2010 J/kg °C. The heat of fusion of water is 333000 J/kg and the heat of vaporization is 2.26 × 106 J/kg. Answer in units of J.When the indoor temperature of a house is 25°C and the outdoor temperature is -8°C, the inside and outside surfaces of the glass are measured to be 21.4°C and 18.1°C. If the glass has an area of 3.06 m2 and a thickness of 6.23 mm, what is the rate of heat (in W) lost though the window [round your final answer to zero decimal places]? {kglass = 0.78 W/m∙K}