...: WELCOME 2011 :...

It is the time to really say good bye and 'ta ta' to 2010, 2011 is coming in less than 24 hours from now. And forsure, there will be millions of ringgit will be burnt today, 31 December 2010 to celebrate a new year, for fireworks. GOOD BYE 2010, WELCOME 2011..!!

In the newspaper already reported that there will closures to some road in the city, starting from 5pm on 31 Dec 2010 until 6am on 1 Jan 2011, for celebrating new year. The roads are Dataran Merdeka, Bukit Bintang, KLCC, Bangsar/Telawi and KL Sentral. Also, most probably there will be another roads to close phase by phase. The fireworks are as usuals, about ten to thirty minutes, then no more.



It depends on the individual to celebrate it or not, to celebrate with families or friends, think of the best way.

The 2011 comes with hope, brings happiness to everybody, hopefully. May this coming new year will give us strength to face a challenging decade until the year 2020 and beyond it. WELCOME 2011..!!

Many of us hoping the year 2011 will brings more happiness, brings more luck and give us so much time to make our ambition a reality. This new year may give us so many sweet moments if we appreciate what we have done before and what we have right now. Lets think about our future, what we have done before and what we do right now will result in the near future whether we will success or not. What we haveright now will not show who we are in the future.

Therefore, we have to act, before we act, we have to plan what we are going to do and then we do what we have planned. After that, we need to check whether we have done according to the plan or not, if not, redo, if yes then proceed to the next step, act to what we have done according to the plan. Hopefully this new year will brings us more joy and a lot of happiness in our life and could be a turning point to us to be more passion and patient in everything that we will do including working and studying, where ever we are. 

:: HAPPY NEW YEAR ::

It's been twelve months gone for the year 2010, in a few days, there will be 2011, a new decade of our life will begin in less than two days. So many things happen to us along the year 2010, some of them were very sweet moments and some of them were the moments that we will not to recall them again, otherwise it will hurt us. Whatever it is, life must go on. Maybe some of our ambitions were not achieved and maybe only half of the ambitions come to reality. Luckily for the SPM candidates, they are happy because the BIG test is over, and i believe that the momentum of their feelings are still there, always happy and thinking nothing, no more readings 'Sejarah', Biology, no more memorizations and no more maths exercises, but they are still thinking to work, to feel what the workers feel. Congratulations for them for finishing the tests. Now we can say GOOD BYE 2010.

The year that engrave my history and my story, people always say like this because througout the year, there are such happy moments happened in their life, so many things that can make us feel very happy, and also, there were a few sweet dates in the year 2010, such as, 20 October 2010 = 20102010,also 10 October '10 = 101010. So sweet right..?Hmm...It's been chosen to be the date of some couples to get married on those dates. soooo sweeettt...! Praise be to Allah. Because of HIM, we can still breath and can still choose the date happily. If we want to see sweet moments and also not-so-sweet moments which had happened in the year 2010, there will be such a long story, so many things happened in the last twelve months. Let by gone be by gone, we have to proceed our life into the next challenge decade with some new technologies, and we need to prepare ourselves the new ideas to improve our life in the near future, in less than 48 hours.

There are something waiting for us, something which is more interesting, something which is better. The year 2011 is coming and it is very near to us right now, and normally many of us are celebrating a new year with fireworks.

:: sHaRiNG is CARing ::

Good afternoon & Salam to all,

Hopefully you are in the good health and enjoy your time with families. I am here today just want to share something with you. This is about my students who come to me during consultation hours, seems like they are worried about their quizzes and their exams (mid semester exam) which already passed and as usual, some of them got higher marks and there are also a few of them got not-so-high mark. Its maybe due to their own preparation and depend on their own effort.

Alhamdulillah, thank God because with His permission, all of have done a good job, however, you can still improve it in the next quizzes and in the end-of-semester examination which is very near, just around the corner. I do not want anything from you, what I want is you can draw result with a flying colors, this is quite important. Until today, I am happy for you because within less than two months some of you already exposed their talent and willing to expose their ideas to me and to their beloved classmates. Here is the evidence of their commitment:

These handwritings are from those who are discussing in my office. Congratulations to you and all your friends. Hopefully, all of you may try this in the next session when we meet again, InsyaAllah after your holiday, hopefully. This is actually for your own good, for your future as professionals.

Hopefully, all ao you will come to our discussion session well prepared so that you can easily can catch up what we will discuss. I hope that you can be independent because you will be the future leaders. Everybody is looking for you, the IIUM graduates. I know you can do it very well. Keep up the good work..!!

:: HAPPY HOLIDAY TO ALL ::

Sure some of you are already at home especially for those who are living in KL-Selangor region. For those who need to travel about 3 hours and above, please enjoy your trip, always calm and please always pray to HIM. Most probably some of you was already in the other country such as Singapore, Thailand or maybe Hong Kong, enjoying holidays with your beloved families. Enjoy your holiday and spend time with them.

For those who are not going anywhere during the holiday, you can actually enjoy it with your loves one, your family, in home. Not all of us can go and enjoy the holiday in other places other than his or her hometown. Actually, visiting (going back to kampung) parents is the most useful holidays, without them, we are not here. Please remember that, they are willing to do anything just for us, their sons & daughters, their children.

Therefore, we as their children must give them something, I am sure that they do not want money from us, they do not demand us on the material, they are not materialistic, they are our parents, what they need is LOVE. This is what they want and demand from us. So, as children, we must be very thankful to them for taking care of us until we can learn very well, and some of us already working as doctors, lawyers, architects and the other professional field in Malaysia and also in the other countries. Please remember our parents, give them LOVE as they has given to us long time ago.

... TUTORIAL 5B ...

There's another tutorial, again... *sigh*

By the way, this tutorials are very important, therefore, for those who has tutorials to do & to finish, then plese do so as soon as possible, this is for your own good, for the future of the Ummah. This is the latest tutorial for u to download and try it by yourself. I know you are going to have a holiday for one week. yuuuhhuuuu... I'm happy for you...

Please take a look at this tutorial:

TUTORIAL 5B: VIBRATIONS, WAVES & SOUND

1.   You drop a stone into a well that is 7.35 m deep. How long does it take before you hear the splash?

2.   (a) A car moves with a speed of 45.0 mi/h toward a stationary observer as it's horn is blown emitting a frequency of 445 Hz. What frequency is heard by the observer?

(b) Two cars move toward each other having a speed of 22.5 mi/h. If one car's horn is blown with a frequency of 445 Hz, what frequency is heard by observers in the other car?

3.     A pipe has a length of 2.46m

a)   Determine the frequencies of the first three harmonics if the pipe is open at each end. Take 345 m/s as the speed of sound in air.

b)   What are the lowest possible frequencies if the pipe is closed at one end and open at the other?

c)   Sketch a wave pattern for fundamental frequency if;

                                         i.    The pipe is open at one end and close at the other

                                        ii.    The pipe is open at both end

4.     A 3.00 m long pipe is in a room where the temperature is 20⁰C.

Case 1: Open pipe

a)     What is the fundamental frequency?

        b)     What is the frequency of the second harmonic?

Case 2: Closed pipe

a)     What is the fundamental frequency?

        b)     What is the frequency of the second harmonic?

5. A train at rest emits a sound at a frequency of 1 000 Hz. An observer in a car travels away from the sound source at a speed of 30.0 m/s. What is the frequency heard by the observer?

QUESTIONS IN THE TEXT BOOK:

23, 25, 26, 27, 28, 30 PAGE: 493

<<< TUTORIAL 5A >>>

After some times there are no post about the tutorial, rite now the tutorial is ready, the latest tutorial 4 all...

Its from our new topics. U may download it or u can view it from this page. Here is the tutorial 5 part 1, (5A):

TUTORIAL 5A: VIBRATIONS, WAVES & SOUND

1.   A tennis player uses a racket to bounce a ball up and down with a constant period. Is this a simple harmonic motion? Explain.

2.   A 1.50 kg block at rest on a frictionless tabletop is attached to a horizontal spring having constant 19.6 N/m. The spring is initially unstretched. A constant 20.0 N horizontal force is applied to the object causing the spring to stretch.

(a)        Determine the speed of the block after it has moved 0.300 m from equilibrium.

(b)        Find the frequency of the motion.

(c)         If the spring is cut in half, what happen to its displacement?

3.   A mass–spring system is in SHM in the horizontal direction. If the mass is 0.25 kg, the spring constant is 12 N/m and the amplitude is 15 cm;

a.   What would be the maximum speed of the mass?

b.   Where would this occur?

c.   What would be the speed at a half-amplitude position?

4.   Transverse waves with a speed of 50.0 m/s are to be produced on a stretched string. A 5.00 m length of string with a total mass of 0.0600 kg is used.

(a) What is the required tension in the string?

(b) Calculate the wave speed in the string if the tension is 8.00 N.

5.   Given the same tension and length, will a thicker or thinner guitar string sound higher in frequency? Why?

QUESTIONS FROM TEXT BOOK

(PAGE 456 QUESTIONS NO. 49, 50, 53, 54)

49. A phone cord is 4.00 m long. The cord has a mass of 0.200 kg. A transverse wave pulse is produced by plucking one end of the taut cord. The pulse makes four trips down and back along the cord in 0.800 s. What is the tension in the cord?

50. A circus performer stretches a tightrope between two towers. He strikes one end of the rope and sends a wave along it toward the other tower. He notes that it takes the wave 0.800 s to reach the opposite tower, 20.0 m away. If a 1 m length of the rope has a mass of 0.350 kg, find the tension in the tightrope.

53. Transverse waves with a speed of 50.0 m/s are to be produced on a stretched string. A 5.00 m length of string with a total mass of 0.0600 kg is used.

(a) What is the required tension in the string?

(b) Calculate the wave speed in the string if the tension is 8.00 N.

54. An astronaut on the Moon wishes to measure the local value of g by timing pulses traveling down a wire that has a large object suspended from it. Assume a wire of mass 4.00 g is 1.60 m long and has a 3.00 kg object suspended from it. A pulse requires 36.1 ms to traverse the length of the wire. Calculate g_Moon from these data. (You may neglect the mass of the wire when

 calculating the tension in it.)

6.   Explain why sound travels faster in warmer than in colder air.

:: LRT..? MRT..? ::

What are those things..?What is LRT? What is MRT..?Most of us did not really aware about what our government is looking for and what actually our government plan to have in our country...There are also KTM Komuter, Keretapi Tanah Melayu, ERL, KLIA Express, and also Monorail. So many public transport in KL which are using the same type of railway except for Monorel. from its name we can already identified that Monorail is a transport with one rail, mono = one. In ther near future which is less than five years time, our country will have another public tranport called MRT planned to have route from Sungai Buloh to kajang in Balakong. Most probably, the stations will be more than ten "pit-stop" or stations. We can only just wait and see what will happen to our country and lets together we wait for this MRT, I heard that it can have four hundred over thousands at a time will be using this new public transport when it finish.

:: aLL tHe BesT ::

Normally and usually, we will say something to our frens and family especially when they will having tests and examination or anything like interviews. Some will say, "Good luck for your exam tonight..", and some would give to you another words, "All the best..!!" or maybe your frens are speaking arabic, "Bit-tawfeeq". There are so many words and ways of wishing your colleagues to do the something or tests in their best way after putting the effort to study and redise what to do in the tests.

In addition, I believe that most of us wishing their frens intentionally and personally because of their prayer, to show that we are concern about them, pray for them to have the best result after they do the tests in their best way. 

I would like to take this opportunity to wish all my students and their frens the very best of luck in your mid semester exam which will be held tonight. After studying for a few weeks, this is the biggest test ever after having two small tests. I am trying and doing my best to help all of you. I knew that all of you are seeking the highest grade in the subjects. I am praying that all of you can do it better as compared to our previous two small tests. These are the tests from human being, there will be tests from our Creator, ALLAH the Almighty, He is giving us the tests everyday and everynight, its depend on us how to face the tests. The way you answer the tests will show your preparations and your readiness. We cannot always find excuse by saying, "I am not yet ready for the test". Actually, we must always be prepared because we do not even know any tests from Allah the Almighty, its the same concept here. Therefore, we must always be prepared for the tests. ALL THE BEST & GOOD LUCK..!

:: CAN I HELP YOU? ::

Salams & Hi everybody...

I am here again to express my feelings..I feel upset because of some people in our place here did not really aware, is it? Or they aware but because of their mind set and always thinking that there are no such people here with this sticker at the car.

What is the purpose of our administration create such parking lot? The parking lots are special for them, the parking lots with labeled especially for OKU. If there any cars parked at those sepcial parking lots without this sticker, it will really embarassed, of course they are normal persons and they need to feel ashamed to others. I don't really know about their feelings, but I think and I guess, they just want to have easy access and there are no parking lot anymore which is near to the entrance. Some of them asked, "Is there any OKU here..?". The answer is, "Of course there are OKU's, if not, there will be no such parking lots built here."

Therefore, for those who are stealing those parking lots, please set your mind, don't think short, think of the others most because they are special to us. Please be aware, do not take something from the others, only you can make it difference. Do not take the things that belongs to others. Let us together respect the others' properties. In this case the parking lots especially built for the special. I know you can make it!

:::ANSWERS:::

Salam to all,

I am very sorry for being late posting the answers of our tutorials.especially toturials 3A & 3B. Hopefully all of u can enjoy doing the tutorials after this because the answers are ready for u to check. Please remember your TARGET and please do not STRESS in doing our tutorials and execises. You have to be SMART in setting up your target. Be brave to try or do something new to you. Enjoy your tutorials and happy studying. May Allah bless us all.

::::TUTORIAL 3B::::

TUTORIAL 3B-PHYSICS, SHF 1215, SEM 2, 2010/2011

Chapter: Circular Motion

1      A bicycle being repaired is turned upside down, and one wheel of 33 cm in diameter is rotated at a rate of 6.28 rad/s. The wheel slows uniformly until it stops in 15 s.

(i)           How many revolutions does it make during this time?                       

(ii)          How far will a point on the edge of the wheel have traveled in this time?                                                                                                                       

2          A floppy disc in a computer rotates from rest up to an angular speed of 31.4 rad/s in a time of 0.892 s.

a)            What is the angular acceleration of the disk, assuming the angular acceleration is uniform.

b)           How many rotations does the disk make while coming up to speed?

c)            If the radius of the disk is 4.45cm, find the final linear speed of a microbe riding on the rim of the disk.

d)           What is the magnitude of the tangential acceleration of the microbe at this time?

3          A 3 500 kg aeroplane is flying in a circular path of radius 2 000 m at a constant speed of 40 ms^-1.

(i)           On the diagram above, use a labelled arrow to show the direction of tangential velocity, centripetal acceleration and centripetal force acting on the aeroplane.

(ii)          How long will it take the aeroplane to fly one complete circle?

(iii)        What is the magnitude and direction of the acceleration of the aeroplane?

4             The wheel of a moving car slows uniformly from 60.0 rads^-1 to 120.0 rads^-1 in 4.0s. The radius of the wheel is 0.35m.  Calculate

(a)       the angular acceleration of the wheel.                

(b)       the tangential acceleration of the wheel.           

(c)       the total acceleration of the wheel at 4.0 s

5             Discus throwers throw the discus by twisting the motion of their bodies as shown. Starting from rest, the thrower accelerates the discus to a final angular speed of 15 rad/s in a time of 0.270s before releasing it. During the acceleration, the thrower moves the discus in a circular arc of radius 0.810m.

[a] Calculate the tangential velocity at the point of release.

[b] Calculate the angular displacement of the discus.  

[c] Calculate the tangential acceleration of the discus.           

[d] If the mass of the discus is 2.0kg, calculate the centripetal force exerted by the thrower at the point of release                                    

6             A child on a merry-go-round is moving with a speed of 1.35 m/s when 1.20 m from the center of the merry-go-round. Calculate (a) the centripetal acceleration of the child, and (b) the net horizontal force exerted on the child whose mass is 25.0 kg. (c) What happens to the speed when the child moves towards the center of the merry-go round assuming that the period of revolution remains the same?

7          A 0.40 kg ball attached to the end of a horizontal cord, is rotated in a circle of radius 1.3 m on a frictionless horizontal surface. If the cord will break when the tension exceeds 60 N, what is the maximum speed the ball can have?

8          In a tumble drier, clothes are placed inside a drum with small holes in it. The drum rotates at high speed and water escapes through the holes. A particular drum has a radius of 0.25m and rotates at 900 revolutions per minute.

(i) Calculate the speed of the rim of the drum.

(ii) Calculate the force necessary to allow a piece of clothing of mass 0.4kg to      perform circular motion.

::::TUTORIAL 3A::::

TUTORIAL 3A-PHYSICS, SHF 1215, SEM 2, 2010/2011

Chapter: Work, Energy & Momentum

1                     (a) If you push against the wall of a building, are you doing any work? Explain.

              (b) A shopper in a supermarket pushes a cart with a force of 35 N directed at an angle of 25° downward from the horizontal. Find the work done by the shopper as she moves down a 50-m length of aisle.

2                    A 98.0-N grocery cart is pushed 12.0 m by a shopper who exerts a constant horizontal force of 40.0 N. If all frictional forces are neglected and the cart starts from rest, what is its final speed?

3          A student could either pull or push, at an angle of  from the horizontal, a 50-kg crate on a horizontal surface, where the coefficient of kinetic friction between the crate and surface is 0.20. The crate is to be moved a horizontal distance of 15 m. Compared with pushing, pulling requires the student to do (1) less, (2) the same, or (3) more work

4          A roller coaster travels on a frictionless track as shown in figure below. (a) If the speed of the roller coaster at point A is  what is its speed at point B? (b) Will it reach point C? (c) What speed at point A is required for the roller coaster to reach point C? (11m/s)

                                                                                                                                                                       

5          A pendulum is launched from a point of height h above its lowest point in two different ways as shown in figure above. During both launches, the pendulum is given an initial speed of 2.0 m/s. On the first launch, the initial velocity of the pendulum is directed upward along the trajectory, and on the second launch it is directed downward along the trajectory. Which launch will cause it to swing the largest angle from the equilibrium position? Give reason for your answer. 

6          The graph shows how the force F on a body of mass 0.5kg varies with the displacement x form origin.

a.                  What is the work done by the force when the body is displaced 4.0m from the origin?

b.                  The velocity of the body at the origin is 2.0m/s. what is the velocity when it is 4.0m form the origin?

7          The total resistive force on a car travelling at a constant velocity of 20m/s is 1.6 x 10³N. What is the minimum power of the car?

8          An electric motor of power 1200W is used to raise a load of 56 kg. Calculate the minimum time taken to raise the load through a distance of 8 m.

9          A puck glides on smooth surfaces when pushed or hit as in ice hockey. Benjamin is playing with a small puck on a smooth floor. The puck floats on a cushion of air above the floor so the effects of friction can be ignored. The puck has a mass of 155 g. Benjamin pushes the puck so it collides with a wall as shown below.

The puck hits the wall at a speed of 0.75 m s ⁻¹ and rebounds at a speed of 0.61 m s ⁻¹. The collision lasts 0.065 s.

(a) Calculate the size of the momentum of the puck before it collides with the wall.

(b) An inelastic collision is one in which the kinetic energy before the collision is not the same as the kinetic energy after the collision. By doing suitable calculations show that the collision of the puck and the wall is inelastic.

(c) State where the “lost” energy has gone to.

(d) Determine the change in the puck’s momentum during the collision

 (e) Calculate the size and direction of the average force the wall exerts on the puck.

(f) Determine the size and direction of the average force the puck exerts on the wall.

10        Water leaves a hose at a rate of 1.5 kg/s with a speed of 20 m/s and is aimed at the side of a car, which stops it.

(a)    Assuming there is no splashing back,

(i)     what is the force exerted by the water on the car?

 (b)  What if the water splashes back from the car? Would the force on the car be greater or less?

11        A child in a boat throws a 5.4 kg package  out horizontally with a speed of 10 m/s. Calculate the velocity of the boat immediately after, assuming it was initially at rest. The mass of the child is 26 kg and that of the boat is 55.0 kg. 

12        State the quantities that are conserved in an a) elastic collision b) inelastic collision

What happens to the quantity that is not conserved in one of the above collisions? How would you know that the collision between two particles moving with the same speed is perfectly elastic?

13        A pitcher throws a 0.15-kg baseball so that it crosses home plate horizontally with a speed of 20 m/s. It is hit straight back at the pitcher with a final speed of 22 m/s. (a) What is the impulse delivered to the ball? (b) Find the average force exerted by the bat on the ball if the two are in contact for 2.0 x 10^–3 s.(6.3 Ns, 3.2 x 10³ N)

14        Two balls with masses of 2.0 kg and 6.0 kg travel toward each other at speeds of  and , respectively. If the balls have a head-on, inelastic collision and the 2.0-kg ball recoils with a speed of  how much kinetic energy is lost in the collision? (1.1 x 10² J)

15        A 25.0-g object moving to the right at 20.0 cm/s overtakes and collides elastically with a 10.0-g object moving in the same direction at 15.0 cm/s. Find the velocity of each object after the collision.

16        A bullet of mass 2.0 g is fired horizontally into a block of wood of mass 600 g. The block is suspended from strings so that it is free to move in a vertical plane. The bullet buries itself in the block. The block and bullet rise together through a vertical distance of 8.6cm, as shown in figure below

(a) Calculate the change in gravitational potential energy of the block and bullet.

(b) Determine the initial speed of the block and the bullet, after they began to move off   together

(c)Using the information in (b) and the principle of conservation of momentum, determine the speed of the bullet before the impact with the block.