Which of the following is not another way of stating the Principle of Conservation of Energy?Energy may be transferred from one store to another, but may not be created or destroyedThe amount of energy in a given energy store (e.g. internal) is constantThe total amount of energy in a closed system is constantEnergy can only be converted from one form to another2Which of the following will NOT improve the efficiency of a car?Using low resistance cables in its electrical circuitsLubricating the moving parts of its engineStreamlining itSupplying it with less fuel3The gas which is supplied to the heating system in a flat has 400 kJ of chemical potential energy. Of this, 320 kJ is transferred to the thermal store of the fluid inside the radiators in the flat. Calculate the efficiency of the heating system.125 %8 %80 %0.8 %4A speedboat is being accelerated from rest. The efficiency with which energy is being transferred from the chemical store of its fuel to its kinetic store is 0.2. If chemical energy is being transferred from its fuel at a rate of 10 kW, calculate the rate at which energy is being transferred to its kinetic store.0.02 W20 W2 kW2 W5An electric toothbrush has an efficiency of 70 %. Calculate the amount of energy dissipated when 300 J of energy is supplied by its battery.9,000 J210 J4.3 J90 J6Which of the following will NOT decrease the rate at which thermal energy is lost from a house?Installing loft insulationIncreasing the temperature inside the houseReplacing single-glazed windows with double or triple-glazed onesUsing draught excluders at the bottoms of external doors
Question
Which of the following is not another way of stating the Principle of Conservation of Energy?Energy may be transferred from one store to another, but may not be created or destroyedThe amount of energy in a given energy store (e.g. internal) is constantThe total amount of energy in a closed system is constantEnergy can only be converted from one form to another2Which of the following will NOT improve the efficiency of a car?Using low resistance cables in its electrical circuitsLubricating the moving parts of its engineStreamlining itSupplying it with less fuel3The gas which is supplied to the heating system in a flat has 400 kJ of chemical potential energy. Of this, 320 kJ is transferred to the thermal store of the fluid inside the radiators in the flat. Calculate the efficiency of the heating system.125 %8 %80 %0.8 %4A speedboat is being accelerated from rest. The efficiency with which energy is being transferred from the chemical store of its fuel to its kinetic store is 0.2. If chemical energy is being transferred from its fuel at a rate of 10 kW, calculate the rate at which energy is being transferred to its kinetic store.0.02 W20 W2 kW2 W5An electric toothbrush has an efficiency of 70 %. Calculate the amount of energy dissipated when 300 J of energy is supplied by its battery.9,000 J210 J4.3 J90 J6Which of the following will NOT decrease the rate at which thermal energy is lost from a house?Installing loft insulationIncreasing the temperature inside the houseReplacing single-glazed windows with double or triple-glazed onesUsing draught excluders at the bottoms of external doors
Solution
The text you provided seems to be a set of multiple-choice questions related to energy conservation, efficiency, and heat loss. Here are the answers:
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The statement that does not represent the Principle of Conservation of Energy is "Energy can only be converted from one form to another". This statement is incorrect because energy can also be transferred or stored, not just converted.
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The action that will NOT improve the efficiency of a car is "Supplying it with less fuel". Less fuel does not necessarily mean more efficiency; it could lead to less power output.
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The efficiency of the heating system can be calculated using the formula (useful energy output / total energy input) * 100%. In this case, it would be (320 kJ / 400 kJ) * 100% = 80%.
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The rate at which energy is being transferred to the speedboat's kinetic store can be calculated by multiplying the rate of energy transfer from the fuel by the efficiency. So, 10 kW * 0.2 = 2 kW.
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The amount of energy dissipated can be calculated by subtracting the useful energy output from the total energy input. In this case, it would be 300 J - (300 J * 70%) = 90 J.
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The action that will NOT decrease the rate at which thermal energy is lost from a house is "Increasing the temperature inside the house". This would actually increase the temperature difference between the inside and outside of the house, leading to more heat loss.
Similar Questions
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