An American client calls you from Europe for your help in converting the pet food she can purchase over there. The bag says 2200 kJ/kg, what do you tell her is the energy density in kcal/kg? a. 255 kcal/kg b. 525 kcal/kg c. 2200 kcal/kg d. 9205 kcal/kg
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- A.) find the total change in thermal energy involved in changing 4.55 L of water at 75.0oC to ice at -25.0oC. Be sure to include a complete (and clearly labelled) Temperature-Thermal Energy Graph that matches the question. B.) find the speed of a stone as it is about to hit the ground, if it is thrown (in an unknown direction) at 14.9 m/s from a height of 35.0 m (above the ground). Please include steps and graphs also steps!Suppose you have a 1000Wmicrowave that you need to run for 5minto heat up your dinner.1. How much energy does it take to heat up your dinner?2. At$0.12/kWhr, how long much does it cost to warm up your dinner?An electrical power station requires 1.05 × 1014 J of heat transfer into the engine and has an efficiency of 42 %. a.) How much heat transfer occurs to the environment by the electical power station in J? b.) What is the ratio of heat transfer to the environment to work output? c.) How much work is done in J?
- Use energy transfers and conservation (energy interaction modelFor each of the following situations: a. Choose an initial and final state (states A and B) that will be appropriate (interesting) for analysis. b. If there is not already a physical diagram of the situation and there should be one for proper analysis, include one. c. Construct a system schema of the situation. Do not forget to include the system boundary for the system specified by the problem. Choose your system wisely. d. Construct an energy bar chart and system flow diagram (LOL plots) for each problem. e. You are allowed to add other energy storage modes. You do not have to use the energy storage modes that are printed in each LOL plot. f. Find the unknown value.A 39% maximum efficient coal-fired power plant needs to produce 600 MW of power. A. To achieve maximum efficiency, if the waste water is dumped into a 13 degree Celsius lake, what temperature must the steam be heated to? B. Since coal contains 27 kJ of energy per gram, how many kg of coal must be burned in a day?
- The Bodø NATO base in northern Norway uses a heat pump to extract heat from ocean water. 7.0°C ocean water is continuously drawn into the system, heat is extracted, and the water is returned to the ocean at 3.0°C. When the system is working at full capacity, 2000 kW of heat is delivered to the building at the cost of 600 kW of electric energy.a. How much energy is removed from the water (the cold reservoir) each second?b. How much water moves through the system each second?Consider two objects, A and B, which has different temperatures. Also assume that A is hotter then B. What does the 0th law of thermodynamics say about this situation? a. It says that B must be transferring heat to A. b. It says that A must be transferring heat to B. c. The zeroth law of thermodynamics does not apply to this situation. d. It says that A and B are in thermodynamic equilibrium. e. It says that A and B are *not* in thermodynamics equilibrium.Over the course of a day, 4.0 kg of water evaporates from the leaves of a corn plant.a. How much energy is required to evaporate the water? (Assume that the temperature of the leaves is 30°C.)b. If the plant is active for 12 hours, how much power does this correspond to? You can think of this as the necessary power to drive transport in the plant.
- How much work is needed to lift a bag of groceries that weighs 250N to a height of 4m? A. 1000 Calorie B. 1000 J C. 1000 N D. 1000 kJAppmCatiori Cite 2 real life situations showing heat and light energy transformation. Give a brief explanation. Answer Key Analysis A. 1. By striking the matchstick's head on the side of the matchbox.Do convection cells represent a reversible process?A. Yes, because they are orderly.B. No, because they transfer thermal energy from hot to cold.C. It depends on the type of convection cell.