Bicycling on a warm day. If the air temperature is the same as the temperature of your skin (about 30°C), your body cannot get rid of
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- A student is trying to find the energy it takes to melt an ice cube. They measure exactly 95.1 mL of water and pour it into a styrofoam cup. They use a thermometer to find the initial temperature is 23.8 °C, and then drop an ice cube in the water, covering it and stirring until it is completely melted. After it has melted, the water cools to a final temperature of 16.5 °C. How much energy (in calories) did it take to melt this ice cube? Note: The density of water is 1.0 g/mL and the specific heat of water is 1.0 cal/(g·°C)arrow_forwardThe amount of heat per second conducted from the blood capillaries beneath the skin to the surface is 230 J/s. The energy is transferred a distance of 1.8 × 10-3 m through a body whose surface area is 1.7 m2. Assuming that the thermal conductivity is that of body fat, determine the temperature difference between the capillaries and the surface of the skin.arrow_forwardA 1.0 x 102-kg steel support rod in a building has a length of 2.0 m at a temperature of 20.0°C. The rod supports a hanging load of 6.0 x 103 kg. Find (a) the work done on the rod as the temperature increases to 40.0°C, (b) the energy Q added to the rod (assume the specific heat of steel is the same as that for iron), and (c) the change in internal energy of the rod.arrow_forward
- Water is placed into an iron container along with an ice cube. They are thermally isolated.The iron container has a mass of 620. g and is initially at 70.0 degrees Celsius. The water has a mass of 200. g and is initially at 16.0 degrees Celsius. The ice cube has a mass of 86.0 g and is initially at -9.30 degrees Celsius.What is the heat required to bring the iron container AND the water down to 0 degrees Celsius?arrow_forwardA crate of fruit with a mass of 31.0 kg and a specific heat capacity of 3600j/(kgxk) slides 8.40m down a ramp inclined at an angle of 39.4 degrees below horizontal. if the crate was at rest at the top of the incline and has a speed of 2.85 m/s at the bottom, how much work wf was done on the crate by friction? if an amount of heat equal to the magnitude of the work done by friction is absorbed by the crate of fruit and the fruit reaches a uniform final temperature what is its temperature change?arrow_forwardA pronghorn antelope can run at a remarkable 18 m/s for up to 10 minutes, almost triple the speed that an elite human runner can maintain. For a 32 kg pronghorn, this requires an astonishing 3.4 kW of metabolic power, which leads to a significant increase in body temperature. If the pronghorn had no way to exhaust heat to the environment, by how much would its body temperature increase during this run? (In fact, it will lose some heat, so the rise won’t be this dramatic, but it will be quite noticeable, requiring adaptations that keep the pronghorn’s brain cooler than its body in suchcircumstances.)arrow_forward
- Overall, 80% of the energy used by the body must be eliminated as excess thermal energy and needs to be dissipated. The mechanisms of elimination are radiation, evaporation of sweat (2,430 kJ/kg), evaporation from the lungs (38 kJ/h), conduction, and convection. A person working out in a gym has a metabolic rate of 2,500 kJ/h. His body temperature is 37°C, and the outside 5.6696 x 10-8 W/m2 · K4) temperature 22°C. Assume the skin has an area of 2.0 m2 and emissivity of 0.97. (o %D (a) At what rate is his excess thermal energy dissipated by radiation? (Enter your answer to at least one decimal place.) 136.7 Your response differs from the correct answer by more than 10%. Double check your calculations. W (b) If he eliminates 0.44 kg of perspiration during that hour, at what rate is thermal energy dissipated by evaporation of sweat? (Enter your answer to at least one decimal place.) W (c) At what rate is energy eliminated by evaporation from the lungs? (Enter your answer to at least one…arrow_forwardWater 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?arrow_forwardRubbing your hands together warms them by converting work into thermal energy. If a woman rubs her hands back and forth for a total of 10 rubs, at a distance of 7.50 cm per rub, and with a frictional force of 50.0 N, what is the temperature increase in degrees Celsius? The mass of tissue warmed is only 0.100 kg, mostly in the palms and fingers.arrow_forward
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