On a hot summer day, a student turns his fan on when he leaves his room in the morning. When he returns in the evening, will the room be warmer or cooler than the neighboring rooms. Explain the answer. Assume that all the doors and windows are kept closed.
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A: Solution: Given that T0 = -40 °F = 233.15 K T = 86 °F = 303.15 K
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- A 100-gram apple is dropped off a 200 m high cliff. As it falls its temperature drops by 2.5 °C due to the cool surrounding air. If its heat capacity is 4100 J/(kg.K), determine which is greater, the decrease in potential energy as it moves from the top to bottom of the cliff or the decrease in internal energy.A rock of mass 0.432 kg falls from rest from a height of 17.4 m into a pail containing 0.373 kg of water. The rock and water have the same initial temperature. The specific heat capacity of the rock is 1870 J/(kg -C°). Ignore the heat absorbed by the pail itself, and determine the rise in temperature of the rock and water in Celsius degrees. Number UnitsA large block of lead, initially at rest, falls to the ground from a height of h = 0.65 m. The specific heat of lead is c = 130 J/(kg⋅°C). a)Assuming all the block’s kinetic energy at impact goes into increasing its temperature, enter an expression for the block’s temperature increase as a result of its fall, in terms of the defined quantities and the acceleration due to gravity, g.
- Q:33)The surface of the Sun has a temperature of about 5 800 K. The radius of the Sun is 6.96 × 108 m. Calculate the total energy radiated by the Sun each second. Assume that the emissivity is 0.986.#6. My buddy is starting to get hypothermic (body temperature 306 K) during an epic backcountry ski adventure. Since I'm quite warm (body temperature 310 K), I decide to get in a sleeping bag with him to try and warm him up. What heat transfer mechanism will be most responsible for heating him up? For simplicity, ignore any internal temperature differences across my body (that is, assume my skin temperature is also 310 K). Use num- bers to support your answer (for human skin, you can use the following values: surface area A = 1.50 m², emissivity = 0.970, thickness d= 0.0250 m, thermal conductivty 0.200 ms.K)
- #6. My buddy is starting to get hypothermic (body temperature 306 K) during an epic backcountry ski adventure. Since I'm quite warm (body temperature 310 K), I decide to get in a sleeping bag with him to try and warm him up. What heat transfer mechanism will be most responsible for heating him up? For simplicity, ignore any internal temperature differences across my body (that is, assume my skin temperature is also 310 K). Use num- bers to support your answer (for human skin, you can use the following values: surface area A = 1.50 m², emissivity € = 0.970, thickness d = 0.0250 m, thermal conductivty 0.200 ms.K) JThe "steam" above a freshly made cup of instant coffee is really water vapor droplets condensing after evaporating from the hot coffee. What is the final temperature of 205 g of hot coffee initially at 98.0°C if 3.18 g evaporates from it? The coffee is in a Styrofoam cup, and so other methods of heat transfer can be neglected. Assume that coffee has the same physical properties as water; its latent heat of vaporization is 539 kcal/kg and its specific heat is 1.00 kcal/(kg · °C).To keep yourself warm in the winter, you heat a solid metal ball and place it on a stand in the center of your room. The ball has a radius of 17.0 cm and an emissivity of 0.830. If your room has a temperature of 15°C, what is the net power radiated by the ball initially, when the ball's temperature is 200°C?