-
8/12/2019 11DP Mid Year 2012
1/16
Year 11 DP Physics2012 Semester One Examination
Tuesday 22 May 2012
1 hour 30 minutes Student name: ________________
Teacher name: ________________
Instructions to candidates:
Reading time: 5 minutes
Working time: 1 hour 30 minutes
Write using black or blue en
Write your name on e!ery age
"o not oen this e#amination aeruntil instructed to do so
Format:
Section A: 15 multile$choice %uestions&orth 1 mark each'
(ttemt ()) %uestions'
*or each multile choice %uestion+ choose theletter o, the ans&er you consider to be the bestand indicate your choice in the sace ro!idedon the e#amination aer'
Section B: 5 ,ree$resonse %uestions &ortha total o, -5 marks'
(ttemt ()) %uestions'
*or each %uestion+ ans&er in the sacero!ided on the e#amination aer'
-
8/12/2019 11DP Mid Year 2012
2/16
Section A. Multiple Choice
1. The mass of an electron is 9.1 1031kg and that of a proton is 1.7 1027kg. Which one of the following is the dierence in the order of magnitde ofthe masses of the electron and the proton!
". 10.#
$. 7.%
&. '.%
(. 3.0
Answer [ ]
2. Which of the following is a )alid statement!
". " measrement that is not precise can *e accrate.
$. " measrement that is precise is alwa+s accrate.
&. " measrement that is not precise will alwa+s *e inaccrate.
(. ,epeated measrements will alwa+s increase accrac+ and precision.
Answer [ ]
3. Which of the following is a list of scalar -antities onl+!".speed distance mass
$.weight speed acceleration
&.)elocit+ displacement force
(.mass )elocit+ acceleration
Answer [ ]
%. The masses and weights of dierent o*/ects are independentl+ measred.
The graph is a plot of weight )erss mass that incldes error *ars.
-
8/12/2019 11DP Mid Year 2012
3/16
These eperimental reslts sggest that
". the measrements show a signicant random error *t small s+stematicerror.
$. the measrements show a signicant s+stematic error *t small randomerror.
&. the measrements are precise *t not accrate.
(. the measrements are accrate *t not precise.
Answer [ ]
'. *mltiples of nits ma+ *e epressed sing a pre. Which one of thefollowing lists the prees in decreasing order of magnitde!
Answer [ ]
4or 5estions 6 and 7The graph *elow shows the )ariation with time t of the )elocit+ v of an o*/ectmo)ing along a straight line.
". centi micro milli nano$.
kilo centifemto
micro
&
. giga mega micro milli(.
mega kilo micro nano
-
8/12/2019 11DP Mid Year 2012
4/16
6. The displacement of the o*/ect *etween t 8 0 s and t 8 '.0 s is
". 2.0 m. &. 17 m.
$. 1' m. (. 2' m.
Answer [ ]
7. Which of the following is the most correct statement a*ot the o*/ectsmotion *etween t 8 %.0 s and t 8 6.0 s.
". The o*/ect is accelerating towards the negati)e direction.
$. The o*/ect is decelerating towards the positi)e direction.
&. The o*/ect is mo)ing at a constant speed in the negati)e direction.
(. The o*/ect is mo)ing at a constant speed in the positi)e direction.Answer [ ]
#. Which of the following graphs does notrepresent an o*/ect at rest!
B
C
-
8/12/2019 11DP Mid Year 2012
5/16
Answer [ ]
9. Two carts of dierent mass m and M are connected *+ a spring. The+ arepshed together sch that the spring is compressed.
"fter the carts are released the cart of mass m mo)es with )elocit+ v. The
change in the momentm of mass M is
". mv.
$. mv.
&. Mv.
(. Mv.
Answer [ ]
10. " constant force acts on a mass that is initiall+ at rest. Which of the
following graphs *est shows how the kinetic energ+ Eof the mass changes
-
8/12/2019 11DP Mid Year 2012
6/16
with the work W done on the mass! 4riction is negligi*le.
Answer [ ]
11. " mar*le rolls down an ne)en frictionless slope from rest shown inthe diagram. The total distance mo)ed *+ the mar*le is ' m. What is thespeed of the mar*le /st when it reaches the grond!
". %.' ms1
$. 6.3 ms1
&. 7.1 ms1
(. 10 ms1
Answer [ ]
12. The kinetic energ+ of a *od+ of mass mmo)ing with a )elocit+ vis K.What is the kinetic energ+ of a *od+ of mass 2mand mo)ing with a )elocit+
2v!". K
$. 2K
2
m
-
8/12/2019 11DP Mid Year 2012
7/16
&. %K
(. #K
Answer [ ]
13. The temperatre of an ideal gas is a measre of the molecles:a)erage
". )elocit+$. momentm
&. kinetic energ+
(. fre-enc+ of collisions
Answer [ ]
1%. When energ+ is spplied to a solid which is at its melting point". the energy gained is used to break the bonds bet&een the solid molecules
$. the solid does not gain any energy since the temerature remains unchanged
&. the energy gained causes the solid molecules to mo!e ,aster
(. the solid slo&ly e!aorates
Answer [ ]
1'. Two o*/ects near each other are at the same temperatre. Which of thefollowing statements has to *e tre!
". The o*/ects ha)e the same internal energ+
$. The o*/ects ha)e the same thermal capacit+
&. ;o thermal energ+ is echanged *etween the o*/ects
(. The net thermal energ+ echanged *etween the o*/ects is
-
8/12/2019 11DP Mid Year 2012
8/16
Figure.
The point & shows the speed of the *all /st *efore it toches the =oor. Theacceleration de to gra)it+ can *e assmed to *e 9.# ms2.>o ma+ assme thatthere is negligi*le air resistance.
?a@(edce the speed of the *all when it reaches the end of the slope. A! "#r$B
?*@&alclate the length of the slope. A! "#r$B
?c@&alclate the height of the slope ?h@ from the ta*le top. A% "#r$sB
?d@&alclate the height of the ta*le from the =oor.A% "#r$sB
17. This -estion is a*ot an eperiment designed to in)estigate ;ewton:ssecond law. Cn order to in)estigate ;ewton:s second law (a)id arranged fora hea)+ trolle+ to *e accelerated *+ small weights as shown *elow. Theacceleration of the trolle+ was recorded electronicall+. (a)id recorded theacceleration for dierent weights p to a maimm of 3.0 ;. De plotted agraph of his reslts.
-
8/12/2019 11DP Mid Year 2012
9/16
?a@(escri*e the graph that wold *e epected if two -antities are proportionalto one another.A% "#r$sB
?*@(a)id:s data are shown *elow with ncertaint+ limits inclded for the )aleof the weights. (raw the *estt line for these data.A% "#r$sB
?c@Ese the graph to(i) eplain what is meant *+ a s+stematic error.A% "#r$sB
(ii) estimate the )ale of the frictional force that is acting on the trolle+. A!"#r$B
-
8/12/2019 11DP Mid Year 2012
10/16
(iii) estimate the mass of the trolle+. A% "#r$sB
1#. " child plls a 1' kg sled containing a '.0 kg dog along a straight path
on a hori
-
8/12/2019 11DP Mid Year 2012
11/16
?*@&alclate the normal force of the srface on the s+stem. A% "#r$sB
?c@&alclate the acceleration of the s+stem. A% "#r$sB
?d@&alclate the work done *+ the childIs plling force as the s+stem mo)es a
distance of 7.0 m. A% "#r$sB
?e@"t some later time the dog rolls o the side of the sled. The child contines
to pll with the same force. Hn the aes *elow s$etcha graph of speed ?v)
)erss time ?t)for the sled. Cnclde *oth the sledIs tra)el with and withot
the dog on the sled. &learl+ indicate with the s+m*ol T, the time at which
the dog rolls o. A% "#r$sB
-
8/12/2019 11DP Mid Year 2012
12/16
19. This -estion is a*ot a *oncing *all.
" soft r**er *all of mass 0.20 kg is dropped from rest on to a =at hori
-
8/12/2019 11DP Mid Year 2012
13/16
?a@Jark on the graph a*o)e the time t1where the *all hits the srface and thetime t2 where it /st loses contact with the srface. A% "#r$sB
?*@Ese data from the a*o)e graph to determine the height to which the *allre*onds.A% "#r$sB
?c@Ese data from the graph to nd the change in momentm of the *all*etween t1and t2.A% "#r$sB
?d@(etermine the magnitde of the a)erage force that the *all eerts on thesrface.A% "#r$sB
?e@Kplain how the collision *etween the *all and the srface is consistent withthe principle of momentm conser)ation. A% "#r$sB
-
8/12/2019 11DP Mid Year 2012
14/16
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . .
?e@Cs the magnitde of the force that the srface eerts on the *all greater thansmaller than or e-al to the force that the *all eerts on the srface!Kplain. A% "#r$sB
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . .
?f@ " hard r**er *all of the same mass as the soft r**er *all is dropped fromthe same height as that from which the soft r**er *all was dropped. Li)enthat the hard r**er *all eerts a greater force on the srface than the softr**er *all sketch on the graph opposite how +o think the )elocit+ of thehard r**er *all will )ar+ with time. ?;ote that this is a sketch graphM +o do
not need to add an+ )ales.@ A% "#r$sB
-
8/12/2019 11DP Mid Year 2012
15/16
20. Cn an eperiment two falling weights are sed to pll a string thattrned a paddle wheel s*merged in water in a copper can as shown in4igre #. The weights are descended throgh a distance and wond pagain se)eral times to renew the motion of the paddle. The winding p of theweights does not case the paddle to trn. The mechanical energ+ released*+ the falling weight has con)erted into thermal energ+ *+ the paddle wheel
casing the temperatre of the water to rise.
Figure.'
The following information is pro)idedJass of water 8 '00 gJass of copper can 8 #00 g
Jass of each weight 8 1.#k g(istance mo)ed *+ each weight 8 11m;m*er of c+cles ?in each c+cle the two weights are allowed todrop and are then wond *ack to their original positions.@
8 16c+cles
Temperatre rise 8 2.6 N&"cceleration de to gra)it+ 8 9.# ms2
(ssume that no energy is lost to the surroundings
?a@&alclate the work done *+ the two weights in one c+cle A% "#r$sB.
?*@&alculate the energy gained by the aaratus .i'e' the &ater and the coer can/ in the1 cycles A% "#r$sB.
-
8/12/2019 11DP Mid Year 2012
16/16
?c@The pecic heat capacit+ of water is 11 times the specic heat capacit+ ofcopper. Cf the specic heat capacit+ of copper is c epress in terms of c, theenerg+ re-ired to raise '00g of water *+ 1N&. A% "#r$sB
