GCE A Level Physics 1976-2003 Topic 6 work, energy, power

GCE A Level Physics 1976-2003

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TOPIC6

Work, Energy,PowerI i t h c b a l l ( o 1 ' n r a srs ) w a s d r o p p e df l - o r n n i n i t i a l h e i g h r r a h l n d m a d e t h r e eb o u n c e sr h e k i n e t i c c n e r g y o t ' t h e b a l l, imnrediately alierthethiLdirnpact with tlie surl'ace wasA (0,8)3″?g几 B (0.8)2″:s/, C 0,8″ J8(`〃3) D[l-(3× E[l-(0.8)3]″ 02)J″:g乃?8宀 N81/II/2

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l c到

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m

The door o1'a working rcftigerator lel'topen.After sonte is hours,tlre ternperature the room irr which the refi'igerator of i s p l a c e ds i A R C D E unchanged, because the rel'rigcrator absorbs rriuclr as l t c t t l t s i t g i v c so u t . lower, because the refiiseratorrvill extractheat liom the room. unclranged, because refrigcratur therrnostatically the is corrtrollcd higher, becausetlre refrigerator gives out more lreat t h a ni t a b s o r b s . l o w e r, b e c a u s et h e c o o l a n t i n t l r e r e l ' r i g e r a t ow i l l r evaporate much rnorcrapidly. J76/lIl25

A rrassis projectecl vertically upwardsrvith a given vclocity. N c g l e c t i n ga i r r e s i s t a n c e,v h i c h o n e o f t l r e l b l l o w i n o r stiltements correct'l is A I] The kineticenergyo1'tlie mass is a rnaximurnat the maximurn height attained. In accordance rvith tlre'principle of conservationof energy,the total energy of the rnass is coustant throughout rnotion. tlie in accordance with the principle of conservationof momentum,the rnomentumof the rnass is cot'lstant throughout motion. the 'Ihe rnass travels equaldistances during equril pcriods of tirneduringboth ascent and descent. The potentialenergy increa.ses unifbrrnly witlr time duringasceltt./4 J83/rI/l;J86/【

2_pn braking,500 kJ of heatwere proclucecl when a vehicleol ffiorol rnass1600kg was broughtto rest on a level roacJ. The spccdol'tlrevchiclejust belbretlrebrakes rvereapplied rvasA 0,625ms丬 B 0,79n1s丬 C 25nl fll D 52,5Iη sˉ

C

D trJ77/II/30

E 625mslη n勹 q

3

A piccc。

f brass undergocs 3 di11℃

ren1丨 )I ocesses

invOlviI1g

6

changc of cncrgy∶

P: i t i s l i f i e dv e r t i c a l l y r n 2 fl'ornl5 oC to 20"C Q: it is heated R: i t i s a c c e l e r a t cl do r n r e s tt o l 0 r n s -| . i Given that the specific heat capacityof brassis 380 J K-' kg-l and that g= I 0 m s-2,tfte processes, arranged order in of increasing energychange, are A B C D E 4 PgR C,PR@RP PRC9 R@P

The potentialenergyol' a body wheIl it is at poin1 Pa distance.r tiorn a rel'erenceoint O is given by y=h2, p wheret is a constant. What is the force acting on t11e bOdy rvhenit is at P? A I] C D E Zkx n thedirection OP k-r:in direction the OP zero kr in thedirection PO 2k.rin the directionPO

J84/II/2

A c a r o l ' m a s sr n h a sa n e n g i n ew h i c h c l n d e l i v c r p o w e r P . W h a t i s t h e r n i n i m u mt i m c i n w h i c h t h e c a r c a n b e accclerated fi'om restto a speedv?N77/II/3

A甘B上

D算L E卫丝″"′

A balt r

eleasecl l'r'orna height ho abovc a horiz-ctntal surface reboundsto a lreight/r, al'terone bounce.The graph that relates to h1 is shownbelow (Fig. l). ir6

C普

4P

N86/I/4

c` HΞ口°

An objectol'rnass piisses point X with a velocity v and,n a slidesup a liiotionless inclineto stopat point Y which is ilt a lieisht ir aboveX.

h0`cm Fig.1

100

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6 Work, Energy,Power

73

' A ' P h y s i c s ' l ' o p i c a la p e r P

GCE A Level Physics 1976-2003

A s g c l r n d o b j e c l o f ' l n a s s r/ . r l i i l s s e s X r v i t h i r vclocitv T o r r, h i t th e i g h t i v i l l i t r i s e ' l

of I厶

y

l l o u, n r u c l h e a ti s g e r l e r a t e d l ' r - i c t i oi n t h i s p r o c e s s '? r by,\ I.r/i t,(\''l l

1fⅡ‘1\'// fcs’ 1 O

Λ l‘/【 l厶; C扫

内宀

Dlr I,l ttiZJ87/I/5

r)

D E

Mgt sin0 -[:.t 4'1g"r -r/".r .sinJ8I6 8//

C

,4{q.r sin0

{)

A n o l c c t r i cr n o f o fi s r e c l u i r e t o l l t r r l a c a g co l ' r l a s s4 0 0 k g cl h u p a r r i n c s h a{ ' t( l r r o L r g l v c r t i c a l l r c i g h to{ ' 1 2 0 0 n i i r r 2 . 0 r r i i n r . r t cW.l r a tw i l l b c t h e c l e c t l i c ap o w e rr e r l u i r c dl ' t h e s l i overnlleffic:iency 80oI,? is i[ T a k e . qs l 0 m s - 2]Λ 3,2k、/、Ⅴ V D E 50k、 3000k、 V V J87/I/8 B 5,0k、 C 32k、

tr2 tVtrat is tlre power rcquirecl give a bocly of11η ass`冫 to l'orrvard acccleratiori when it is rloving with vc丨 ocity∶ rr r t l l ' i c t i o n a l e t l sa c kn c l i n e d t a n a n g l c0 t c lt h c hOrizOntal? s' i a A B C//rdug in0 s lrapsin0+ tngv trrat, rrrgv 0+ sirtD (`四`7 v″+:l g’ 1iε sn

氵 a,1Ip

V″丁+ E`?`‘

‘ s V

N88lI/513

Tlrc rnutualpotcntialenergy V ol' two rnoleculesseparatcrJ by dislance i.sshowrr the diagrarn. x iny

VV1as

冰

1o Thc graphs be丨 cxpcriI11cnts, AII but ol1c of havc11I1its of cncfgy,、

ow wcrc

ob1ailled fI thc shadcd tu 、 qlich

oIη

fiⅤ C diIrfcrent

A 3 3

eas on thc graphs

shadcd arca docs nOt havc L"lits

of cncrgy?

1fl`Ac V’召r`召 ` J"`讠F

SrrJ/’/9。/9`rJ″aεr/

、 )f WlCn )r氵

A powcr outputof a Ian1p

cr po、ψ

0 B a ball (hrown horizontallyC

force of .ir r e si s t an c c

Which ol'tlrelbllowingcorrectly describe.s fbrce bct、 thc the rriolecules'ld i s t an c eΑΒ C DΕ

vccn

一 'Β亻 r】一17

chalging a capacitor

potcntia I diffcrence

uttractirte for J(rr .f ),'r .r (,'r .\ -<,; .\'>,i

repulsit,e forJ) r't .x ( l't .r ) r.t .\ )/'r .tlft

(.)【 9

c ha rgc

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