QI/ A 80 kg man at 37°C walks under sunrays, drinks 1 kg water at 3°C, the increase in the thermal energy of his body due walking is 31 kJ, he lost heat from sweating by 95 kJ, and his final temperature with the water he drank is 39.5°C. The average specific heat of the human body and water are 3.6 kJ/kg°C and 4.2 kJ/kg°C respectively. Find the heat added to him because of exposing to the sunrays.
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- Specific heat (c) J/kg C 900 Problem 6: Consider a 0.775 kg aluminum pot containing 2.35 kg of water. Substances Solids Aluminum kcal/kg-C 0.215 Concrete 840 0.20 Copper 387 0.0924 Glass 840 0.20 Human Body (37°C) 3500 0.83 Iron, steel 452 0.108 Liquids Water 4186 1.000 Mercury 139 0.0333 Part (a) How much heat, in kilocalories, must be transferred to raise the temperature of the aluminum pot and the water from 30.0°C to the boiling point of water and then boil away 0.775 kg of water (L, = 539 kcal/kg)? Q = sin() cos() tan() 7 8 9 HOME cotan() asin() acos() E 6. atan() acotan() sinh() 1 2. 3 cosh() tanh() cotanh() + END ODegrees O Radians Vol BACKSPACE DEL CLEAR Feedback I give up! Submit Hint Part (b) How long, in seconds, does this take if the rate of heat transfer is 500 W?A 2.80-kg steel ball at 24.7°C is dropped from a height of 15.4 m into an insulated container with 4.50 L of water at 10.1°C. If no water splashes, what is the final temperature of the water and steel? The specific heat of steel and water is 450 J/(kg·K) and 4186 J/(kg·K) respectively.1)A common practice for a person with a high fever is to take a bath in cool water. Assuming an 80 kg person is really ill and needs to cool down from 40°C to 37°C. What is the minimum amount of water needed for bathing assuming the water begins at room temperature, 25°C? The specific heat of the body on average is 3470 J/kg°C and water is 4186 J/kg°C. 16.6 kg 212.2 kg 19.8 kg 200 kg 2( photo question) 3) Describe the distinguishing features between mechanical waves and light waves, and longitudinal versus transverse waves. Be sure to include the terms medium, particles, vacuum, perpendicular and direction of wave motion. professor can you answer these questions please?
- A parcel of air with a volume of 9.3 x 10 km that contains 4.8 x 10 kg of water vapor rises to an altitude where all the water in the parcel condenses and then freezes. What is the change in temperature of the parcel of air due to freezing? Assume the density of air at the condensation altitude is 7.2 x 10 g/m. The specific heat of air is 0.17 cal/g Co, the latent heat of vaporization of water is 540 cal/g, and the latent heat of fusion of water is 80 cal/g.) Express the answer in standard seientific nötation. AT= x 10A 95.0-kg block of ice at 0.00°C breaks off from a glacier, slides along the frictionless ice to the ground from a height of 2.43 m, and then slides along a horizontal surface consisting of gravel and dirt. Find how much of the mass of the ice is melted by the friction with the rough surface, assuming 75.0% of the internal energy generated stays in the ice. Latent heat of fusion (Lf) for water 333,700 J/kg.The thermal conductivities of human tissues vary greatly. Fat and skin have conductivities of about 0.20 W/m · K and 0.020 W/m · K respectively, while other tissues inside the body have conductivities of about 0.50 W/m · K. Assume that between the core region of the body and the skin surface lies a skin layer of 1.0 mm, fat layer of 0.50 cm, and 3.2 cm of other tissues. (a) Find the R-factor for each of these layers, and the equivalent R-factor for all layers taken together, retaining two digits. Rskin m2 · K/W Rfat m2 · K/W Rtissue m2 · K/W R m2 · K/W (b) Find the rate of energy loss when the core temperature is 37°C and the exterior temperature is 0°C. Assume that both a protective layer of clothing and an insulating layer of unmoving air are absent, and a body area of 2.0 m2. W
- A 390-g metal container, insulated on the outside, holds 170.0 g of water in thermal equilibrium at 21.0°C. A 18.0-g ice cube, at -15.0°C, is dropped into the water, and when thermal equilibrium is reached the temperature is 12.0°C. Assume there is no heat exchange with the surroundings. The specific heat capacity of water is 4190 J/kg ∙ K, the specific heat capacity of ice is 2090 J/kg ∙ K and the heat of fusion is 3.34 × 105 J/kg. What is the specific heat capacity of the metal of the container?The temperature of a 5.00-kg lead brick is increased by 525 C°. If the specific heat capacity of lead is 128 J/(kg.C°), what is the increase in the mass of the lead brick when it has reached its final temperature? O 5.80 × 10- -11 kg O 9.12 × 10-11 kg O 1.60 × 10-12 kg O 3.73 × 10-12 kg O 2.80 × 10-12 kgWater is placed into an iron container along with an ice cube. They are thermally isolated.The iron container has a mass of 790. g and is initially at 72.0 degrees Celsius. The water has a mass of 220. g and is initially at 17.0 degrees Celsius. The ice cube has a mass of 80.0 g and is initially at -15.0 degrees Celsius.What is the heat required to raise the temperature of the ice to 0 degrees Celsius?