Full deb ?

yup ... well i think its DEB anyways

Q1 - verify laws of equilibrium for set of co planar forces
- explain how centre of gravity on meter stick was found.
- how did student measure weight of metre stick
- use 1st law of equilibrium to find weight of stick
- calculate sum of clockwise moments and sum of anti clockwise moments about an axis through 0cm mark on metre stick
- explain how these experimental values verify 2nd law of equilibrium for set of co planar forces
- why is it important: (i) metre stick is horizontal, (ii) spring balances hang vertically?


Q2 - specific heat capacity of water
- describe how mass of water + amount of electrical energy supplied were found
- why is it beneficial to set initial temp of water below 20deg (room temp)
- calculate specific heat cap. of water using given data
- what effect would increasing current flowing through coil for same temp rise have on accuracy of final result?


Q3 - wavelength of monochromatic light
- describe with diagram how data is obtained
- use data to calculate wavelength of monochromatic light
- how many extra fringes could have been observed?


Q4 - investigate variation of current with voltage for semiconductor diode in forward bias
- draw circuit diagram used by student to collect data. explain how p.d. is varied
- draw graph to show how current caries with p.d. does graph indicate that semiconductor diode obeys ohms law? why ? explain.
- explain why current caries with p.d. as indicated by graph
- what can be done to ensure diode is not damaged during this experiment


Q5
a - archimedes principle

b - what is angular velocity of object on surface of earth due to rotation of earth about its axis

c - why can you not observe total internal reflection when travelling from less dense medium to more dense medium

d - wave phenomenon distinguishes transvers waves from longitudinal waves

e - thermometric prop. assoc. with mercury-in-glass thermom, + one other thermometric prop.

f - explain how point discharge occurs

g - how much heat energy is gained by water in kettle if current 12A flows for 1min in element of kettle with resistance of 21ohms

h - what is length of wire carriny current 4A, experiences force 20N at angle of 30degrees to magnetic field of flux density 5T

i - what is role of moderator and control rods in fission reactor

j - why is mass of baryon greater than that of meson OR name parts of A,B,C in induction coil (diagram given)


Q 6 - what is simple harmonic motion
state hookes law
calculation
[little paragraph of info given + questions asked based on it] - basic info:
boat = 25m at high tide (10.20am), 12m at low tide (4.40pm) mass of boat = 20,000 kg
(i)- what is period and amplitude of motion of boat
(ii) - what is next time after low tide that boat will be moving at its fastest
(iii) - calculate force boat experiences at high tide
(iv) - find depths of water when force on boat is 1mN
give on other example of body executing simple harmonic motion


Q7 - state laws of refraction of light
[paragraph of info] -
- why must image produced by objective lens be real. draw ray diagram showing how magnified real image is produced
- focal length of lenses in microscope is 7.5mm. if magnification of objective lens is 8, how far from objective lens must specimen be placed?
- at what distance from lens will image observed by eyepiece lens appear if magnification of eyepiece lens is also 8 ?
- how many times smaller would image appear if specien was placed 6.5mm from magnifying glass of focal length 7.5mm
- will image of specimen be inverted or erect?


Q8 - define magnetic flux
- faradays law
- experiment demonstrating faradays law
- coil of wire 5cm x 3cm rotates at 5 revol. per sec. no magnetic field. axis which coil rotates about oves towards area of magnetic flux density of 10T at .5ms-1.
(i) how long does it take for centre of coil to enter magnetic field
(ii) how long does it take for coil to rotate to position B (position B given in diagram)
(iii) find average induced emf in coil when its in position B
(iv) calculate magnetic flux cutting coil when coil has rotated a further 45deg. _ hence find avge induce emf betw. when its in vertical positin + this point
- why would there be no induced emf if the coil was not rotating + remained in positin a while entering magnetic field?


Q9 - article question
- name scientist who introduced the term 'electron' (1891), determined value of charge on electron (1911), discovered that positive charge in atom was concentrated in nucleus
- describe exp scientist performed in 1911 to show pos. charge concentrated in nucleus
- why did it take much longer to discover neutron than the other particles

- explain using bohrs model how light is emitted in a discharge tube when atoms in a gas are excited by an electrical discharge
- calculate wavelength of light produced when electron moves between orbits of energy levels 1.56eV and 3.43eV

- if radium-226 has half life of 1602 years and mass of 20g what number of alpha particles is emitted each sec ?


Q10:
A - particle physics

B - I presume its applied physics, i havent done it so i dunno.


Q11 - article question
- in heat pump of fridge, evaporation of liquid occurs. how does this cause fridge to be cold?
- how is evaporation in heat pump of fridge achieved?
- what properties make liquid suitable for circulating in heat pump?
- if 30g water at 293.15K is added to ice tray whats minimum amount of energy that must be taken from freezer to produce ice?
- state two forms of electromagnetic radiation with higher frequency than light
- why is knowledge of earths magnetic field inportant when designing marine compasses?
-if wavelength of ultrasonic wave produced from ship multiplies by 4.4 when it passes from air to water + time taken for reflected wave to return to ship is .46secs find depth of water at that point
-transformer, with 200 turns in primary coil + 1000 turns in secondary coil is 80% efficient. voltage in primary coil is 230V and current is 2A, what is current in secondary coil?


Q12
A - hot air balloon - mass 1000kg rises at acceleration of 2ms-2 for 20secs. at this time heat is adjusted so balloon then rises at constant velocity. after 10 more secs a stone is dropped.
- how does hot air cause balloon to rise?
(i) calculate height from which stone is dropped
(ii) - length og time takes the stone to hit the ground after it is let go

B-what are stationary waves?
- explain how stationary wave is formed in a pipe opened at both ends
- draw diagrams demonstrating 1st 3 harmonics produced on a pipe open @ both ends
explain from diagrams ow frequencies are related for 1st 3 harmonics.

C - state 2 factors on which capacitance of parallel plate capacitor depends
- describe exp. demonstrating dependence of one of these factors on capacitance of parallel plate capacitor
- when capacitor and resistor are connected in series to 6V battery, explain how p.d changes with time across both components after switch is closed

D - what is photoelectric effect?
- 100W UV light source, wavelength 280nm has all light focused on zinc plate
(i) - prove electrons will be emitted from zinc plate
(ii) - with what speed will electrons be emitted + how many electrons will be emitted from zinc per sec?


and thats it

think so ... not 100% sure though like the teacher never told us :/

the other one is up on this here somewhere too

Whats your email and i ll forward it to ya

ellensheehan1@hotmail.com. Thank you so much.

sent

thanks a million

skoool.ie is useless

what subject?

physics, and i found out he has a masters degree in it .. i have no idea how he got that

hahaha i feel the same way bout most of my teachers smh

My teacher is really intelligent but she cannot teach.