Which of the following is not another way of stating the Principle of Conservation of Energy?Energy can only be converted from one form to anotherThe amount of energy in a given energy store (e.g. internal) is constantEnergy may be transferred from one store to another, but may not be created or destroyedThe total amount of energy in a closed system is constant

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

Conservation of energy:The total amount of energy in a closed system remains constantEnergy cannot be made or destroyed _ _ _ _ one _ to another

Which of the following are aspects of the law of conservation of energy?Energy cannot be createdEnergy cannot be destroyedTotal energy always remains the sameAll of the above

Which statement best describes the law of conservation of energy?A.The total amount of energy does not change during an energy conversion.B.Kinetic energy always equals potential energy.C.Energy always changes back to its original form.D.Energy is created but never destroyed during an energy conversion.SUBMITarrow_backPREVIOUS

Which best describes energy changes in a system?A Energy is conserved, but it can be created or destroyed.B Energy is conserved, and it cannot be created or destroyed.C Energy is not conserved, and it can be created or destroyed.D Energy is not conserved, but it cannot be created or destroyed.