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Parents Pricing Home GCSE Edexcel Physics Combined Science Efficiency Figure 2 shows an energy transfer diagram for a steam engine
Figure 2 shows an energy transfer diagram for a steam engine - Edexcel - GCSE Physics Combined Science - Question 2 - 2019 - Paper 1 Question 2
View full question Figure 2 shows an energy transfer diagram for a steam engine.
The diagram shows the amounts of energy transferred each second by the steam engine.
energy input 2000... show full transcript
View marking scheme Worked Solution & Example Answer:Figure 2 shows an energy transfer diagram for a steam engine - Edexcel - GCSE Physics Combined Science - Question 2 - 2019 - Paper 1
Calculate the amount of wasted energy. Only available for registered users.
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To find the amount of wasted energy, subtract the useful energy output from the total energy input:
w a s t e d e n e r g y = t o t a l e n e r g y i n p u t − u s e f u l e n e r g y o u t p u t = 2000 J − 160 J = 1840 J . wasted \, energy = total \, energy \, input - useful \, energy \, output = 2000 \, J - 160 \, J = 1840 \, J. w a s t e d e n er g y = t o t a l e n er g y in p u t − u se f u l e n er g y o u tp u t = 2000 J − 160 J = 1840 J .
Calculate the efficiency of the steam engine. Only available for registered users.
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Using the efficiency formula, we substitute the values:
e f f i c i e n c y = u s e f u l e n e r g y t o t a l e n e r g y = 160 J 2000 J = 0.08. efficiency = \frac{useful \, energy}{total \, energy} = \frac{160 \, J}{2000 \, J} = 0.08. e ff i c i e n cy = t o t a l e n er g y u se f u l e n er g y = 2000 J 160 J = 0.08. To express efficiency as a percentage, multiply by 100:
e f f i c i e n c y = 0.08 × 100 = 8 % . efficiency = 0.08 \times 100 = 8\%. e ff i c i e n cy = 0.08 × 100 = 8%.
State what happens to the wasted energy. Only available for registered users.
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The wasted energy is generally lost to the environment as heat, which may contribute to energy inefficiency and can cause thermal pollution.
State two ways that the use of coal might be harmful to the environment. Only available for registered users.
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Burning coal releases carbon dioxide, a greenhouse gas that contributes to climate change.
Coal burning can produce harmful pollutants like sulfur dioxide, leading to acid rain.
Calculate the kinetic energy of the model train. Only available for registered users.
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Using the kinetic energy formula:
k i n e t i c e n e r g y = 1 2 × m a s s × ( s p e e d ) 2 = 1 2 × 8.0 k g × ( 1.5 m / s ) 2 . kinetic \, energy = \frac{1}{2} \times mass \times (speed)^{2} = \frac{1}{2} \times 8.0 \, kg \times (1.5 \, m/s)^{2}. kin e t i c e n er g y = 2 1 × ma ss × ( s p ee d ) 2 = 2 1 × 8.0 k g × ( 1.5 m / s ) 2 . Calculating this gives:
k i n e t i c e n e r g y = 1 2 × 8.0 × 2.25 = 9.0 J . kinetic \, energy = \frac{1}{2} \times 8.0 \times 2.25 = 9.0 \, J. kin e t i c e n er g y = 2 1 × 8.0 × 2.25 = 9.0 J . Join the GCSE students using SimpleStudy...97% of StudentsReport Improved Results
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