which would you choose to keep from burning your hand while one end is in the fire?
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A poker is a stiff, nonflammable rod used to push burning logs around in a fireplace. At your disposal are rods made of either Brass or Silicon. Based on the heat capacity, which would you choose to keep from burning your hand while one end is in the fire? (Brass k = 0.40 kJ/kg K, Silicon k = 0.71 kJ/kg K) Explain your reasoning
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- The heating element of a 1200 Watt electric stove can reach temperatures of 815 °C when turned all the way up. If 86.0 % of the heat from the element is transferred into a pot of boiling water, how much water will boil off in one minute? 0.018 x kg Question Help: Message instructor Submit QuestionWhat is the value of the heat absorbed or emitted by liquid water of mass m = 410 g at 12° C to take it to the solid state at -15°C? Take Lf = 333 kJ/kg, the specific heat capacity of ice is 2220 J/kg • K, and the specific heat capacity of liquid water is 4186.8 J/kg • K.Two objects A & B are put into thermal contact and come to equilibrium. • A) m₁ = 100 g; CA = 900 J/(kg K) • B) mB = 200 g; CB = 450 J/(kg K) Their temperatures are initial TA and TÂ, and object A is initially hotter. Which statement about the final equilibrium temperature TEQ is correct? Tave - TA+TB 2 is the average of the initial temperatures. TEQ TA Tave > TEQ > TB TaveA small metal cube with a thermal mass mc and an initial temperature 0 is dropped into a container of water that is actively maintained at a constant temperature 0w. The cube quickly comes to rest on the bottom surface of the container. The bottom surface is maintained at a constant temperature 0 (note that this is different from 0w). The thermal resistance between the cube and the water is Rcw while the thermal resistance between the bottom surface of the container and the cube is RCB. The temperature of the cube is denoted by 0c. a) Draw the system schematic indicating the assumed directions of the heat transfer rates. Label all the nodes and system parameters. b) Derive the governing equation for the temperature of the cube, 0c. c) Where does to appear in the system schematic and how does it affect the governing equations? d) Calculate the steady-state temperature of the cube, css, assuming the following system parameters: 0o = 21°C, 0B = 6°C, 0w = 0°C, Rcw = 2°C/W, and RCB = 4°C/WBeryllium has roughly one-half the specific heat of liquid water (H20). 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. (Use only the symbols > or =, for example a>b=c) (a) raising the temperature of 1 kg of H,0 from 20°C to 26°C (b) raising the temperature of 2 kg of H20 from 20°C to 23°C (c) raising the temperature of 2 kg of H20 from 1°C to 4°C (d) raising the temperature of 2 kg of beryllium from O-1°C to 2°C (e) raising the temperature of 2 kg of H20 from O-1°C to 2°CA cylinder container is divided into two equal sections by thermally isolated, frictionless piston,as shown in the figure. One section contains water and the other air. The cylinder is isolated except the one face of the water section. Each section has an initial volume of 100 liter. The initial temperature of the air is 40 degees C and the water is 90 degrees C with steam quality of 10%. The water are heated slowly until the entire section of the water is filled with saturated steam. Find the final pressure and the amount of heat transported to the container. Assume: the heat transfer is a reversible process. Assume for ideal gas the following relation between p and v: (p2/p1)^((k-1)/k) = (v1/v2)^k-1 ; k=1.4Liquid helium has a very low boiling point, 4.2 K, as well as a very low latent heat of vaporization, 2.00 104 J/kg. If energy is transferred to a container of liquid helium at the boiling point from an immersed electric heater at a rate of 19.0 W, how long does it take to boil away 2.30 kg of the liquid? _________________minA 1,240 kg car going 30 m/s is brought to a stop using its brakes. Let's assume that a total of approximately 30 kg of iron in the brakes and wheels absorbs the heat produced by the friction. (a) What was the car's original kinetic energy (in J)? J (b) After the car has stopped, what is the change in temperature (in °C) of the brakes and wheels? °CA cube (1-1-1m) of ice in a room (50C) sitting on a wooden table. the ice is 1m away from the walls around it's 4 sides, except for 1 side is 30cm away. You're given 2 insulating blankets (1m by 1m) that can be used to cover the ice block. The goal is to keep the ice in solid form as long as possible. Where would you put the blankets?