You leave a pastry in the refrigerator on a plate and ask your roommate to take it out before you get home so you can eat it at room temperature, the way you like it Instead, your roommate plays video games for hours. When you return, you notice that the pastry is still cold, but the game console has become hot. Annoyed, and knowing that the pastry w-ill not be good if it is microwaved, you warm up the pastry by unplugging the console and putting it in a clean trash bag (which acts as a perfect calorimeter) with the pastry on the plate. After a while, you find that the equilibrium temperature is a nice, warm 38.3 ℃. You know that the game console has a mass of 2.1 kg. Approximate it as having a uniform initial temperature of 45 ℃. The pastry has amass of 0.16 kg and a specific heat of 3.0 k J/(kg . ℃), and is at a uniform initial temperature of 4.0 ℃. The plate is at the same temperature and has a mass of 0.24 kg and a specific heat of 0.90 J/(kg . ℃). What is the specific heat of the console?
You leave a pastry in the refrigerator on a plate and ask your roommate to take it out before you get home so you can eat it at room temperature, the way you like it Instead, your roommate plays video games for hours. When you return, you notice that the pastry is still cold, but the game console has become hot. Annoyed, and knowing that the pastry w-ill not be good if it is microwaved, you warm up the pastry by unplugging the console and putting it in a clean trash bag (which acts as a perfect calorimeter) with the pastry on the plate. After a while, you find that the equilibrium temperature is a nice, warm 38.3 ℃. You know that the game console has a mass of 2.1 kg. Approximate it as having a uniform initial temperature of 45 ℃. The pastry has amass of 0.16 kg and a specific heat of 3.0 k J/(kg . ℃), and is at a uniform initial temperature of 4.0 ℃. The plate is at the same temperature and has a mass of 0.24 kg and a specific heat of 0.90 J/(kg . ℃). What is the specific heat of the console?
You leave a pastry in the refrigerator on a plate and ask your roommate to take it out before you get home so you can eat it at room temperature, the way you like it Instead, your roommate plays video games for hours. When you return, you notice that the pastry is still cold, but the game console has become hot. Annoyed, and knowing that the pastry w-ill not be good if it is microwaved, you warm up the pastry by unplugging the console and putting it in a clean trash bag (which acts as a perfect calorimeter) with the pastry on the plate. After a while, you find that the equilibrium temperature is a nice, warm 38.3 ℃. You know that the game console has a mass of 2.1 kg. Approximate it as having a uniform initial temperature of 45 ℃. The pastry has amass of 0.16 kg and a specific heat of 3.0 k J/(kg . ℃), and is at a uniform initial temperature of 4.0 ℃. The plate is at the same temperature and has a mass of 0.24 kg and a specific heat of 0.90 J/(kg . ℃). What is the specific heat of the console?
Two rooms, each a cube 4.1 m per side, share a 13-cm-thick brick wall. Because of a number of 100-W lightbulbs in one room, the air is at 29 ∘C, while in the other room it is at 8.0 ∘CHow many of the 100-W bulbs are needed to maintain the temperature difference across the wall?
The giant hornet Vespa mandarinia japonica preys on Japanese bees. However, if one of the hornets attempts to invade a beehive, several hundred of the bees quickly form a compact ball around the hornet to stop it. They don’t sting, bite, crush, or suffocate it. Rather they overheat it by quickly raising their body temperatures from the normal 35 C to 47 C or 48 C, which is lethal to the hornet but not to the bees . Assume the following: 500 bees form a ball of radius R=2.0 cm for a time t= 20 min, the primary loss of energy by the ball is by thermal radiation, the ball’s surface has emissivity ´=0.80, and the ball has a uniform temperature. On average, how much additional energy must each bee produce during the 20 min to maintain 47 C?
Should a modern kitchen be air-conditioned? Will this create cold food(which is supposed to be hot)? What are some solutions that would keep employees comfortable and keep the food hot?
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