Questions with Complete Revision Notes and Answers.
8463/1H
Time allowed: 1 hour 45 minutes
Materials For this paper you must have:
• a ruler
• a scientific calculator
• the Physics Equation Sheet (enclosed)
Instructions
• Use black ink or black ball-point pen.
• Fill in the boxes at the top of this page.
• Answer all questions.
• You must answer the questions in the spaces provided.
• Do all rough work in this book. Cross through any work you do not want to be marked.
• In all calculations, show clearly how you work out your answer.
Information
• The maximum mark for this paper is 100.
• The marks for questions are shown in brackets.
• You are expected to use a calculator where appropriate.
• You are reminded of the need for good English and clear presentation in your answers.
• When answering questions 12.3 and 17.2, you need to make sure that your answer:
o is clear, logical, sensibly structured
o fully meets the requirements of the question
o shows that each separate point or step supports your overall argument.
Advice
• In all calculations, show clearly how you work out your answer.
,SECTION A: ENERGY (30 marks)
Question 1 (Multiple Choice)
A child of mass 35 kg climbs a rope to a height of 4.0 m in a gymnasium. She then slides down a
pole, reaching a speed of 3.5 m/s just before her feet touch the ground. The gravitational field
strength, .
Which statement about the energy transfers is correct?
A Her gravitational potential energy at the top equals her kinetic energy at the bottom.
B Her maximum gravitational potential energy is 1372 J and her kinetic energy at the bottom is
214.4 J.
C The difference between her gravitational potential energy and kinetic energy has been entirely
transferred to elastic potential energy in the pole.
D Her kinetic energy at the bottom is greater than her gravitational potential energy at the top
due to energy being created during the descent.
[1 mark]
Question 2
A rollercoaster car of mass 450 kg is released from rest at point A, which is 28 m above the
ground. It descends to point B (8 m above ground) and then climbs to point C (15 m above
ground). Air resistance and friction are negligible. .
2.1 Calculate the gravitational potential energy lost by the car as it moves from point A to point
B.
[2 marks]
2.2 Calculate the kinetic energy of the car at point B.
[1 mark]
, 2.3 Calculate the speed of the car at point B.
[3 marks]
2.4 Explain why the car will not reach point C if there is significant air resistance. Your answer
should refer to energy transfers.
[2 marks]
Question 3
A Sankey diagram for a gas-fired power station is shown below. The total input energy is 800
MJ.
plain
Copy
Input: 800 MJ ──┬── Useful Electrical Output: 320 MJ
├── Cooling Tower Loss: 280 MJ
├── Flue Gas Loss: 120 MJ
└── Other Losses: [ ] MJ
3.1 Calculate the energy represented by "Other Losses."
[2 marks]
3.2 Calculate the efficiency of the power station. Give your answer as a percentage.
[2 marks]
3.3 The power station generates 320 MJ of useful electrical energy every 50 seconds. Calculate
the useful power output.
[2 marks]
Question 4
A student investigates how the rate of cooling of water depends on the material wrapped
around a beaker. The beaker contains 200 g of water at an initial temperature of 80°C. The room
temperature is 20°C.
4.1 State the independent variable in this investigation.
[1 mark]