h2 physics Archives - SINGAPORE LEARNER

H2 PHYSICS PRACTICAL

Posted on January 17, 2020November 22, 2024 by admin

PLEASE NOTE THIS IS AN OUTDATED POST.

FOR THE LATEST SCHEDULE, CLICK ON

We provide A-Level / H2 and O-Level Physics, Chemistry, Biology and Science (Physics/Chemistry/Biology) Practical training for private / school candidates and homeschoolers, for both local (eg. H2, Singapore-Cambridge) and international exams (CIE, IGCSE).

MOE/SEAB SYLLABUS FOR H2 PHYSICS PRACTICAL

Paper 4 (Practical) is weighted to 20% of the Higher 2 assessment.

Candidates are expected to have been exposed to a range of topics and experimental techniques such as:

Measurement and Uncertainty, including the use of vernier callipers and the micrometer screw gauge
Calculation of percentage errors
Precision of instruments, including decimal places and significant figures
Kinematics and Forces, including the use of the Newton-meter, springs and pulleys.
Period of Oscillations
Moments and Centre of Gravity
Thermal Physics
Electricity, including the use of potentiometers, diodes, capacitors and digital multimeters
Electromagnetism
Recording of observations in tables and plotting of graphs
Identification of Sources of Error in experiments and ways to overcome them
Planning an experiment including identification of independent, dependent and control variables as well as safety precautions

OUR STRUCTURED PRACTICAL TRAINING SYSTEM

Based on the above syllabus, we have several structured programs for you, depending on whether you are a Beginner or a Reviser.

You are at the Beginner level if you have never done any H2 Physics Practical work before, or your last Physics Practical session was more than 2 years ago.

You are at the Reviser level if you have completed the Beginner practicals, or you are re-taking your Physics Practical exam, or you are a school candidate who has completed JC1/Y5.

OUR H2 PHYSICS PRACTICAL SCHEDULE (OUTDATED)

BASIC LABS (for Beginners only):

Lab HP1: OSCILLATION 1, MEASUREMENT 1, PERCENTAGE ERROR (TOPICAL TRAINING, LEVEL: BEGINNER) (Available sessions: 29/11 (10:30-1pm), 16/1 (2-4:30pm), 18/1 (2-4:30pm), 19/1 (2-4:30pm), 20/1 (10:30-1pm), 21/1 (2-4:30pm))

Lab HP2: MOMENTS, UPTHRUST, SOURCES OF ERROR (TOPICAL TRAINING, LEVEL: BEGINNER) (Available sessions : 6/2 (2-4:30pm), 8/2 (2-4:30pm), 9/2 (2-4:30pm), 10/2 (10:30-1pm), 11/2 (2-4:30pm))

Lab HP3: THERMAL PHYSICS (TOPICAL TRAINING, LEVEL: BEGINNER) (Available sessions: 27/2 (2-4:30pm), 29/2 (2-4:30pm), 1/3 (2-4:30pm), 2/3 (10:30-1pm), 3/3 (2-4:30pm))

Lab HP4: ELECTRICITY (POTENTIOMETER 4) + PLANNING (ELECTROMAGNETISM) (TOPICAL TRAINING, LEVEL: BEGINNER) (Available sessions: 19/3 (2-4:30pm), 21/3 (2-4:30pm), 22/3 (2-4:30pm), 23/3 (10:30-1pm), 24/3 (2-4:30pm))

Note: The above 4 labs are BASIC TRAINING LABS which are available throughout the year, every week every month, as they are compulsory for all beginners. Thus if the date you can attend is not listed above, please message our Admin at 88765498 for a new schedule.

STANDARD LABS (for Retakers and current govt school students):

Lab HP5: SPRING EXTENSION + PULLEY 5 + POTENTIOMETER 5+ OSCILLATION 5 (EXAM PAPER TRAINING, LEVEL: REVISER) (Available sessions: 16/4 (2-4:30pm), 18/4 (2-4:30pm), 19/4 (2-4:30pm), 20/4 (10:30-1pm), 21/4 (2-4:30pm))

Lab HP6: MEASUREMENT 6 (VERNIER CALIPER & MICROMETER) + ELECTROSTATICS (CAPACITOR) + OSCILLATION 6 (EXAM PAPER TRAINING, LEVEL: REVISER) (Available sessions: 14/5 (2-4:30pm), 16/5 (2-4:30pm), 17/5 (2-4:30pm), 18/5 (10:30-1pm), 19/5 (2-4:30pm))

Lab HP7: FORCES 7+ OSCILLATION 7 + D.C CIRCUITS 7 (EXAM PAPER TRAINING, LEVEL: REVISER) (Available sessions: 28/5 (2-4:30pm), 30/5 (2-4:30pm), 31/5 (2-4:30pm), 1/6 (10:30-1pm), 2/6 (2-4:30pm))

Lab HP8: PENDULUM 8 + D.C CIRCUITS 8 + PULLEY SYSTEM 8 (EXAM PAPER TRAINING, LEVEL: REVISER) (Available sessions: 18/6 (2-4:30pm), 20/6 (2-4:30pm), 21/6 (2-4:30pm), 22/6 (10:30-1pm), 23/6 (2-4:30pm))

Lab HP9: OSCILLATION 9 + D.C CIRCUITS 9 + AIR RESISTANCE (EXAM PAPER TRAINING, LEVEL: REVISER) (Available sessions: 9/7 (2-4:30pm), 11/7 (2-4:30pm), 12/7 (2-4:30pm), 13/7 (10:30-1pm), 14/7 (2-4:30pm))

Lab HP10: D.C CIRCUITS 10 + OSCILLATION 10 + SPRING 10 (EXAM PAPER TRAINING, LEVEL: REVISER) (Available session : 30/7 (2-4:30pm), 1/8 (2-4:30pm), 2/8 (2-4:30pm), 3/8 (10:30-1pm), 4/8 (2-4:30pm))

Lab HP11: REBOUND HEIGHT + INCLINED PLANE + POTENTIOMETER 11 (EXAM PAPER TRAINING, LEVEL: REVISER) (Available sessions: 20/8 (2-4:30pm), 22/8 (2-4:30pm), 23/8 (2-4:30pm), 24/8 (10:30-1pm), 25/8 (2-4:30pm))

Lab HP12: MECHANICS + ELECTRICITY (POTENTIOMETER 12) (EXAM PAPER TRAINING, LEVEL: REVISER (Available Session: 10/9 (2-4:30pm), 12/9 (2-4:30pm), 13/9 (2-4:30pm), 14/9 (10:30-1pm), 15/9 (2-4:30pm))

Lab HP13: FRICTION 13 + OSCILLATION 13 + POTENTIOMETER 13 (EXAM PAPER TRAINING, LEVEL: REVISER ) (Available Session: 1/10 (2-4:30pm), 3/10 (2-4:30pm), 4/10 (2-4:30pm), 5/10 (10:30-1pm), 6/10 (2-4:30pm))

Lab HP14: OSCILLATION OF WIRE + RATE OF HEAT LOSS + POWER OF A RESISTOR (EXAM PAPER TRAINING, LEVEL: REVISER) (Available session: 22/10 (2-4:30pm), 24/10 (2-4:30pm), 25/10 (2-4:30pm), 26/10 (10:30-1pm), 27/10 (2-4:30pm))

Lab HP15: PENDULUM 15 + FRICTION 15 + POTENTIOMETER 15 (EXAM PAPER TRAINING, LEVEL: REVISER) (Available sessions: (Comfirm with admin)

Lab HP16: OSCILLATION 16 + POTENTIOMETER 16 + FORCES 16 (NEWTON-METER) (EXAM PAPER TRAINING, LEVEL: REVISER) (Available sessions: (Comfirm with admin)

MOCK EXAMS FOR SCIENCE PRACTICAL (JUNE TO OCT)

CRASH COURSES (JUNE TO OCT):

H2 CHEMISTRY HANDS-ON PRACTICAL CRASH COURSE

H2 BIOLOGY HANDS-ON PRACTICAL CRASH COURSE

H2 PHYSICS HANDS-ON PRACTICAL CRASH COURSE

PAST TOPICS OF H2 PHYSICS PRACTICAL:

2022: Oscillation (slotted masses hanging from a string), W.E.P, Electricity (not potentiometer)

2023:

The first question (14m) was on circuits, construct a circuit with a wire-jockey potentiometer and a fixed resistor in parallel, then vary the fixed resistors (we were given 5 in total) while adjusting the length of the wire in contact with the jockey to keep the ammeter reading in the circuit constant.

The second question (8m) was on oscillations, where there was a short stick with two metal balls hanging from it by strings, and a diagonal stick crossing the strings which allowed the length of string to be varied and hence the period of oscillation.

The third question (22m) was on forces where students had to build a cantilever by hanging one edge of a meter rule off the table while the other edge remained on the table, and placing weights on it to find the balance point, then do calculations.

The planning question was on measuring background radioactivity count rate for different distances from a building and from the ground.

What you will get at each practical session:

(1) Teaching and instruction on how to use the various scientific tools and instruments.

(2) Tips on how to answer a practical worksheet or exam paper, including recording of observations, drawing graphs, writing conclusions, describing precautions and planning a practical.

(3) Notes on important aspects of science practicals.

We will also conduct Mock Practical Exams in September and October

HOW TO BOOK A LAB SESSION:

(1) Decide which Program or Lab sessions you need or most suitable for.

(2) Whatsapp or Message our staff at 88765498 with your Name, Private or School Candidate, A or O level, Subject or Lab Name (e.g Lab PP2), Date and Time of Lab. (Our staff will then guide you on how to register and make payment. If you are not sure about the lab sessions, just state your Name and the Subjects and we will get back to you)

(3) Register Online by clicking below:

(4) Pay Registration fee of $30 via Paynow or funds transfer.

(5) Make the required payment for each lab session at least 5 days before the date of the lab session. (You may also pay for several sessions at one go to ensure that you will have a place in future slots)

FEES PER SESSION

Practical Training Session: $320

Mock Exam:- $380

SPECIAL DISCOUNT FOR ADDITIONAL SUBJECT: For every H2 Physics lab session you book, you can also book a H2 Chemistry lab session for only $270 (usual fee: $320). To view our H2 Chem schedule, click the link below:

H2 CHEMISTRY PRACTICAL

Note: Above fees are subject to changes without prior notice.

IMPORTANT : The full fee must be paid at least 5 days before the practical session to confirm your attendance as a lot of preparation is needed for practicals coupled with very limited class size. PLEASE NOTE IF YOU ARE ABSENT FOR A LAB SESSION, A PENALTY OF $50 MUST BE PAID TO POSTPONE THIS LAB TO ANOTHER SESSION, AND ONLY 1 POSTPONEMENT IS ALLOWED FOR EACH LAB, ELSE THE LAB IS CONSIDERED COMPLETED AND PAID FOR, AND NO REFUND WILL BE GIVEN. THE FEE FOR THE MISSED LAB CANNOT BE USED FOR ANOTHER LAB.

Singapore Learner @ Bukit Batok

Blk 644, Bukit Batok Central, #01-68. S(650644).

Tel: +(65) 6569 4897, +(65) 88765498 (WHATAPPS) http://wa.link/w0xxk2

Email: principal@singaporelearner.com

If you wish to visit us, kindly call or sms first. Thank you.

A-Level, H2 Physics, JC Physics, Practical, Pure Physics

H2 MOCK PRACTICAL EXAM (PHYSICS)

Posted on September 26, 2019March 20, 2021 by admin

For 2020 schedule click on this link:

MOCK EXAMS FOR SCIENCE PRACTICAL (2020)

To do your A-Level H2 Physics Practical Mock Exam, please choose one or more of the following slots:

Session 1: Thursday 17/10, 9 am – 12 pm. (Code: H2PP1)

Session 2: Thursday 17/10, 2 pm – 5 pm. (Code: H2PP2)

Session 3: Friday 18/10, 9 am – 12 pm. (Code H2PP3)

Location: BLK 644, BUKIT BATOK CENTRAL, #01-68. s(650644)

At the end of each session, the tutor will go through the answers with you, highlight your mistakes (if any) and give you tips on how to score well for your actual practical.

If you need training,

Session 1: Saturday 28/9, 4.30 pm – 7 pm. (Code: H2TPP1)

Session 2: Friday 4/10, 10 am – 12.30 pm. (Code: H2TPP2)

Session 3: Saturday 5/10, 4.30 pm – 7 pm. (Code: H2TPP3)

Session 4: Tuesday 8/10, 10 am – 12.30 pm. (Code: H2TPP4)

Session 5: Friday 11/10, 10 am – 12.30 pm. (Code: H2TPP5)

Session 6: Saturday 12/10, 4.30 pm – 7 pm. (Code: H2TPP6)

To book a Practical session (MUST be at least 3 days in advance),

(1) SMS or Whatsapp the following info to 9786 0411: (a) Name of student; (b) Date and Time; (c) Subject OR (d) Name and Code.

(2) Pay $160 (O-level, per session) or $280 (A-level, per session) via cash or online transfer or Paylah or Paynow (to 9786 0411).

* If you prefer days and timings different from our regular schedule, a surcharge of $30 per session is imposed as extra preparation is needed on our side.

For enquiries, please whatsapp to 9786 0411 or call our centre at 6569 4897.

Location: BLK 644, BUKIT BATOK CENTRAL, #01-68. s(650644)

A-Level, H2 Physics, JC Physics

H2 PHYSICS MARCH HOLIDAYS INTENSIVE TOPICAL RELEARNING 2018

Posted on February 6, 2017March 20, 2021 by admin

Dates: 12/3 (Day 1), 13/3 (Day 2), 14/3 (Day 3), 15/3 (Day 4)

Time : 9.30 am 12.30 pm (Session 1), 2.00 pm – 5.00 pm (Session 2)

Location West: Blk 644, Bukit Batok Central, #01-68. S(650644).

(Our location is just a 3-min walk from either the Bukit Batok MRT station or theBukit Batok Bus Interchange. Buses that stop along the roads surrounding our location are numbers 157, 178, 66, 506, 173, 174, 176, 187, 985. Buses services which terminate at Bukit Batok Bus Interchange are 61, 77, 106, 173, 177, 189, 852, 941, 945, 947)

Focus: CONCEPTUAL UNDERSTANDING & APPLICATION OF SKILLS

Format: Teaching + Worksheets + Discussions

Course Outline (Each session is 3 hrs long):

Day 1 Session 1: Kinematics – Projectile Motion

Day 1 Session 2: Dynamics – Linear Momentum

Day 2 Session 1: Forces – Turning Effects & Equilibrium

Day 2 Session 2: WEP – Inclined Plane & Spring Problems

Day 3 Session 1: Circular Motion

Day 3 Session 2: Gravitational Field

Day 4 Session 1: Oscillations

Day 4 Session 2: Thermal Physics

FEES for Each Session: $180 (must be paid in full by 8/3 to confirm your attendance)

Minimum number of students to start each session: 2 (if only one student signs up, either the course is cancelled and he will be refunded his $180 or he can proceed to have a 1-1 coaching by topping up an additional $90 only).

TO REGISTER, SMS <STUDENT NAME> , <H2PHYMAR>, <DAY>, <SESSION> TO +(65) 9786 0411

_______________________________________

TUITION CLASSES:

_______________________________________________________________

EDUCATIONAL SERVICES:

______________________________________________________________

By EX-MOE TEACHERS & EXPERIENCED TUTORS

@ BLK 644, BUKIT BATOK CENTRAL, #01-68. S(650644).

CALL 65694897 OR SMS 997860411.

H2 Physics

H2 PHYSICS TOPICAL CRASH COURSE

Posted on August 10, 2016October 13, 2016 by admin

This H2 Physics Syllabus 9646 Topical Crash Course is designed to help busy students prepare sufficiently for the H2 Physics A-Level Exam in 2016. Conducted by an experienced JC Physics Tutor, this course aims to help students understand, master and apply the key concepts tested in the H2 Physics Exam.

DUE TO ADDITIONAL REQUESTS, NEW DATES HAVE BEEN ADDED.

From 3/10 to 31/10, 1-1 or group lessons are also available from 10 am – 12 pm or 1 pm – 3 pm for students on study leave. Fee is $200 per 2-hr lesson. Fee can also be shared between 2 or 3 students.

DATE	DAY	TIME	TOPIC	CODE
22/8	MON	8.00 PM – 9.30 PM	Measurement	H2P1
24/8	WED	8.00 PM – 9.30 PM	Kinematics	H2P2
25/8	THUR	8.00 PM – 9.30 PM	Dynamics	H2P3
1/10	SAT	9.30 AM – 11.00 AM	Forces	H2P4
1/10	SAT	8.00 PM – 9.30 PM	Work, Energy & Power	H2P5
2/10	SUN	9.30 AM – 11.00 AM	Circular Motion	H2P6
3/10	MON	8.00 PM – 9.30 PM	Gravitational Field	H2P7
5/10	WED	8.00 PM – 9.30 PM	Oscillations	H2P8
8/10	SAT	9.30 AM – 11.00 AM	Thermal Physics	H2P9
8/10	SAT	8.00 PM – 9.30 PM	Wave Motion	H2P10
9/10	SUN	9.30 AM – 11.00 AM	Superposition	H2P11
10/10	MON	8.00 PM – 9.30 PM	Electric Fields	H2P12
12/10	WED	8.00 PM – 9.30 PM	Current of Electricity	H2P13
13/10	THUR	8.00 PM – 9.30 PM	D.C. Circuits	H2P14
15/10	SAT	9.30 AM – 11.00 AM	Electromagnetism	H2P15
15/10	SAT	8.00 PM – 9.30 PM	Electromagnetic Induction	H2P16
19/10	WED	8.00 PM – 9.30 PM	Alternating Currents	H2P17
20/10	THUR	8.00 PM – 9.30 PM	Quantum Physics	H2P18
22/10	SAT	9.30 AM – 11.00 AM	Lasers & Semiconductors	H2P19
22/10	SAT	8.00 PM – 9.30 PM	Nuclear Physics	H2P20

Location: Blk 644, Bukit Batok Central, #01-68. S(650644).

(Our location is just a 3-min walk from either the Bukit Batok MRT station or the Bukit Batok Bus Interchange. Buses that stop along the roads surrounding our location are numbers 157, 178, 66, 506, 173, 174, 176, 187, 985. Buses services which terminate at Bukit Batok Bus Interchange are 61, 77, 106, 173, 177, 189, 852, 941, 945, 947)

Focus: CONCEPTUAL UNDERSTANDING & APPLICATION OF SKILLS

Format: Teaching + Worksheets + Discussions

Fee: $90 per student per session

Background of Tutor:

The tutor is a RI & RJC alumnus and a NIE-trained ex-teacher who has been teaching JC Physics for 8 years.

TO REGISTER, SMS <STUDENT NAME> , <CODE> TO 97860411.

Note:

(1) As places are limited, pre-payment is necessary to confirm your attendance. You can make cash or cheque payment by visiting the centre at the address above. If student attendance for a session is not confirmed, the centre reserves the right to cancel that session.

(2) If only one student signs up for a particular session, that session is considered a 1-1 session and the student will be asked whether he or she wants that session to be conducted at a fee of $120.

(3) The centre reserves the right to cancel any session due to unforeseen circumstances. If payment has been made for a cancelled session, the student (s) will be refunded in full.

(4) If a student withdraws from a session, a full refund can only be given if the centre is notified of the withdrawal not less than 5 days from the date of the session. No refund will be given if no notification of withdrawal is given or the notification is given on or just one day before the date of the session.

_______________________________________

TUITION CLASSES:

_______________________________________________________________

EDUCATIONAL SERVICES:

______________________________________________________________

By EX-MOE TEACHERS & EXPERIENCED TUTORS

@ BLK 644, BUKIT BATOK CENTRAL, #01-68. S(650644).

CALL 65694897 OR SMS 98530744 OR 97860411.

H2 Physics Answers

H2 PHYSICS PRACTICAL (20% weightage)

1 ai) The horizontal component of the velocity is unchanged.

ii) Along the vertical direction, the object’s velocity increases linearly from zero. This is because a resultant downward force acts on the object to cause it to accelerate. Thus velocity increases with t by the relationship of v(y) = gt.

bi) Horizontal component of the velocity decreases with time due to air resistance acting opposite to the object’s direction of motion.

ii) Vertical component of the object’s velocity increases from 0 with time at a slower rate due to air resistance. Thus the downward acceleration is less than g.

c) Path with air resistance will fall closer to the building.

2 ai) The angle which is subtended at the centre of a circle by an arc length equal to the radius of the circle.

ii) The product of 2π radian and the frequency.

bi) Ek = 0 , Ep = mgh = 4.7 x 10^-3 J

ii) 0.557 Hz

3 a) Increase in internal energy of a system is the sum of work done on the system and the heat supplied to the system.

bi) 4.98 x 10^-2 mol

ii) 1. -226 J

2. 0 J

iii) work done on gas: -226 , heat supplied to gas: -884

increase in internal energy: 344, 540, -884

4 a) Resultant displacement at a point due to two or more waves is the vector sum of the displacements due to those waves acting individually.

bi) 57.3º

ii) 0.49 : 1

5 a) Emax = h (c/f) – hf

bi) 4.35 x 10^-7

ii) Gradient of graph = hc

h = 6.667 x 10^34 J

c) Draw a line parallel to the original line but cutting the x-axis at a larger value.

6 a) A region of space set up by a mass, a charged particle or magnet, and surrounding the body, a field which can exert a force on another body that is not physical.

ii) The statement did not specify the type of field and state of particle. Hence the field may be gravitational field, and the force is due to the mass of the particle. The field may also be magnetic field. The magnetic force on the particle is only zero when it is in motion and not moving parallel to the magnetic field.

bi) Any point within a charged sphere will have no electric field.

ii) 1. A = 4.0cm B = 2.0cm

2. The spheres have opposite signs. Since E is always >0, indicating that the electric fields from A and B are in the same direction.

iii) 1. 3.00 x 10^-15 J

2. a= 1.24 x 10^13 m/s²

3. From 4 to 18.5 cm, the electric field is predomniantly contributed by sphere A and decreasing with distance from A. Acceleration is +3eE/m

The acceleration of the nucleus decreases from a max value at 4cm to a minimum value at 18.5cm

From 18.5 to 28 cm, the minimum E starts to increase again, indicating that the E-field from 18.5cm onwards is predominantly from B. The E field’s direction is the same, and E >0, the lithium nucleus acceleration increases again.

7 ai) The ratio of the potential difference across the wire to the current flowing through the wire.

ii) The resistivity of a wire is a property of the material. It is related to the resistance by the equation R = pl/A

bi) 4.9Ω

ii) 118 turns

c) B = 0.72μ (NI/r)

di) 8.54 x 10^-24

ii) 4.58 x 10^-2

e) Vertical component of the electron’s velocity is perpendicular to the B field and hence it is subjected to a centripetal force. Horizontal component is parallel to the B field and remains constant as there is no magnetic force accelerating the horizontal velocity. Hence the resultant path is helical.

8 ai) A spontaneous and random process in which an unstable nucleus changes into a different nuclide, emitting radiation.

ii) It is unpredictable in both when and which particular nuclide will decay.

iii) Not triggered by external factors.

bi) 2.54 x 10^-10

ii) 4.25kg

ci) 156 W

di) The half life of plutonium is much longer than polonium. For a space flight lasting several years, the original quantity of polonium will have decayed to less than half in a year. Since plutonium has a long half life, over seven years, more than half would still be remaining.

ii) Plutonium has a higher power density as strontium has a much smaller mass and energy release.

A -LEVEL H2 MATH JUNE HOLIDAYS INTENSIVE REVISION

A-LEVEL H2 PHYSICS JUNE HOLIDAYS INTENSIVE REVISION

JUNIOR COLLEGE / A-LEVEL TUITION:

$math jc$

$f math$

_______________________________________________________________________

______________________________________________________________

By EX-MOE TEACHERS & EXPERIENCED TUTORS

@ BLK 644, BUKIT BATOK CENTRAL, #01-68. S(650644).

CALL 65694897 OR SMS 98530744 OR 97860411.

H2 Physics Answers

NEW!

H2 PHYSICS HANDS-ON PRACTICAL CRASH COURSE

H2 CHEMISTRY HANDS-ON PRACTICAL CRASH COURSE

H2 BIOLOGY HANDS-ON PRACTICAL CRASH COURSE

Practical training:

H2 PHYSICS PRACTICAL

H2 CHEMISTRY PRACTICAL

H2 BIOLOGY PRACTICAL

1) C 2) A 3) A 4) D 5) D

6) C 7) C 8) D 9) C 10) D

11) B 12) B 13) B 14) C 15) A

16) B 17) A 18) C 19) A 20) D

21) D 22) C 23) B 24) D 25) A

26) D 27) D 28) B 29) A 30) D

31) D 32) C 33) D 34) B 35) D

36) C 37) A 38) D 39) A 40) C

1 ai) Y = 60.0 N

ii) θ = 13°

b) For S to be in equilibrium, Rx = Ry = 0. If weight of S and angle of rope A is maintained, then Rx = X cos 30° > 0

2 a) P-type doping introduces more holes to the semiconductor, increasing the number of charge carriers. This increases the semiconductor’s ability to conduct electric current.

b) When forward biased, the holes in the p-type will be attracted to the negative terminal of the battery while electrons of the n-type will be attracted towards the positive terminal. A large current flows through and depletion region is decreased.

When battery is reversed, the holes in p-type are attracted to negative terminaal and elecrtons of the n-type are attracted to the positive terminal. Width of depletion region increases, junction voltage increases. No current flow.

3 a) As R increases from 0, V of qx decreases, V of xq increases. Since the terminal pd is V(wq) = V(wx) + V(xq) = 5.0 + V(xq) , V(wq) increases with R.

bi) 4.84V

ii) 96.8%

ci) 1.2V

ii) 0.531m

iii) When J is moved towards Q, L will be more than 0.531m. Hence the V in pj will be greater than in pk. Therefore the pd across K and J is greater than 0, which means there is a current through the ammeter now.

4 ai) After time, the coil would have turned an angle about the axis PQ. The magnetic flux linkage is 120BA cos (2π/T)t.

According to Faraday’s law, the induced emf is directly proportional to the rate of change of magnetic flux linkage through the coil, hence E is a sinusoidal function. The negative sign comes from Lenz’s law which states that induced emf opposes the change producing it.

ii) 1. 0.170V

25.0 Hz

b) 6.94 x 10^-3 T

5 a) The work done per unit mass by an external agent in bringing a mass from infinity to that point.

bi) 1.19 x 10^27 kg

ii) -1.36 c 10^31 J

c) 1.41 x 10^7 m/s

d) Both Gravitational and electric field strength is related to their respective potentials by the negative of their potential gradient.
Gravitational potential is always < 0 whereas electric potential can be either positive or negative.

6 a) Rate of change of A decreases with increasing time. At the start, the system M and the disc moves very quickly. There is alot of resistive force from the fluid for the disc to overcome and thus A decreases at a high rate. As M and the disc moves slower, there is lesser resistive force and thus a slower energy loss, causing A to decrease at a lower rate.

bi) 5.00, 1.8, -4.0

ii) Plot the point ( 5.00 , -4.0 ), Draw the best fit line.

iii) -0.310 kg

iv) Equation 1 represents a straight line graph of ln A against 1/m with a negative gradient and a non-zero y-intercept.

v) 1. 0.124 kg/s

8.62 x 10^-2

c) 5.59 s

d) since t is directly proportional to m, as m increases, t also increases.

The lamp, detector and material are all placed in a black box.

After the lid is put in place, the intensity meter should read zero. The holes which the wires are should be kept as small as possible.

The lamp itself is isolated in a compartment and light can only enter via a converging lens. Distance between light source and material d is 1m. Leave a small gap of 1mm between the detector and material.

Set up the experiment.
Switch on the lamp and measure the intensity.
Switch off the lamp, put the slab in and measure I through the slab.
Use a pair of vernier calipers to measure t.
Repeat steps by using 2 slabs taped together, then 3 slabs, and so on, till a total of 6 results is obtained.
Record readings in a table.
Plot a graph of ln I vs t.