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A: let Emf be E and internal resistance be r terminal voltage= V V=E-ir - (1)
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A:
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Q: What is a simple electric circuit?
A: A simple electric circuit is the complete path circuit around which an electric current can flow.
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Q: How much energy (in J) is required to evaporate 25% of 4g of water currently at 100 oC?
A: M= 4g only 25% is to be evaporated evaporated mass, m=25100×4= 1 g
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A: X-rays are photons, that is high energy light-waves. When emitted by a source, for example, radium ,...
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A: Given data: Angle of incidence, i=300
Q: 43. ••An object experiences a constant acceleration of 2.0 m/s along the -x axis for 2.7 s, attainin...
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Cite two reasons why firewalkers don’t burn their wetted feet when they walk barefoot on red-hot coals?
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- Beryllium has roughly one-half the specific heat of water (H2O). Rank the quantities of energy input required to produce the following changes from the largest to the smallest. In your ranking, note any cases of equality, (a) raising the temperature of 1 kg of H2O from 20C to 26C (b) raising the temperature of 2 kg of H2O from 20C to 23C (c) raising the temperature of 2 kg of H2O from 1C to 4C (d) raising the temperature of 2 kg of beryllium from 1C to 2C (e) raising the temperature of 2 kg of H2O from -1C to 2CAs a cook you hold place a metal pan(with a wooden handle attached to it) on top a hot flame and then notice that you cannot touch the metal pan but you can still touch the wooden handle. Explain using your knowledge of physics how this is possible?What is the role of “loose” electrons in heat conductors? (A) Loose electrons move quickly away from hot locations, making it impossible for energy to move and making the object a good insulator. (B) Loose electrons absorb energy, giving materials a high specific heat capacity. (C) Loose electrons vibrate and emit radiation that carries energy through the material at the speed of light. (D) Loose electrons transfer energy rapidly through a solid.
- At night, the surface of the earth cools, mostly by radiation. The surface radiates energy upward; the much cooler sky above radiates much less. Patches of ground under trees can stay warmer, which is why, if you livesomewhere that has cold, clear nights, you may have noticed some mornings when there is frost on open patches of ground but not under trees. Why does being under a tree keep the ground warmer?You are standing in Death Valley, California on a summer afternoon, and the temperature is well above 100 degrees. You place a piece of asphalt (Specific Heat = 0.915 J/g°C) and a piece of concrete (Specific Heat = 0.879 J/g°C) on the ground next to one another. If you were to crack an egg onto each surface, which one would be more likely to fry the egg completely? Please explain.Consider a double-pane window consisting of two glass sheets separated by a 1-cm-wide air space. Someone suggests inserting a thin vinyl sheet in the middle of the two glasses to form two 0.5-cm-wide compartments in the window in order to reduce natural convection heat transfer through the window. From a heat transfer point of view, would you be in favor of this idea to reduce heat losses through the window?
- On a cold day, you grab a piece of metal and a fallen tree limb, both with bare hands. Both have been lying outside for a long time and are at the same temperature. The metal feels colder than the tree limb. Why?You apply a flame to 2 L of water for a certain time and its temperature rises by 1°C. If youapply the same flame for the same time to 4L of water, what happens to its temperature? . Why?Now or Later? You are on a date and you come earlier. You ordered two cups of coffee but you have no wish to drink the coffee alone. If you want to preserve the hotness of the coffee, while waiting for your date, should you add the cream now, or later by the time your date Tit comes? Why?
- Please answer all my questions A house walls that are 21 cm thick and have an average thermal conductivity twice that of glass wool. Assume there are no windows or doors. The walls’ surface area is 1350000 cm2 and their inside surface is at 21°C, while their outside surface is at 6°C. (Thermal conductivity of glass wool is 0.042 W/m°C) (i) Calculate the rate of heat conduction through house walls? Answer for part 1 (ii) How many 100W room heaters would be needed to balance the heat transfer due to conduction? (approximate number) Answer for part 2 b) A spherical infrared heater of radius 5.5 cm has an emissivity of 0.73. What temperature must it run at if the required power is 0.54 kW? Neglect the temperature of the environment. (Stefan's constant = 5.67*10-8 Wm-2K-4) The temperature of the heater in Celsius =Radiation is emitted(a) only by glowing objects such as the Sun.(b) only by objects whose temperature is greater than thetemperature of the surroundings.(c) only by objects with more caloric than their surroundings.(d) by any object not at 0 K.(e) only by objects that have a large specific heat.The loss of body heat via convection is described by which statement? The body gives off waves of heat from uncovered surfaces. An oscillating fan blows currents of cool air across the surface of a warm body. Body fluid in the form of perspiration is vaporized from the skin. The body transfers heat to an ice pack, causing the ice to melt.