1 hour

IB DIPLOMA PROGRAMME PROGRAMME DU DIPLÔME DU BI PROGRAMA DEL DIPLOMA DEL BI

N07/4/PHYSI/HPM/ENG/TZ0/XX+

88076501

Physics higher level PaPer 1 Thursday 8 November 2007 (afternoon)

INSTRUCTIONS TO CANDIDATES

• Do not open this examination paper until instructed to do so. • Answer all the questions. • For each question, choose the answer you consider to be the best and indicate your choice on the

answer sheet provided.

8807-6501

21 pages © IBO 2007

–2– 1. Which of the following contains only fundamental SI units? A. B. C. D. ampere volt mole kilogram newton second ampere metre

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second kelvin kilogram tesla

2.

The mass of a body is measured with an uncertainty of 2.0 % and its volume with an uncertainty of 10 %. What is the uncertainty in the density of the body? A. B. C. D. 0.2 % 5.0 % 12 % 20 %

3.

The molar mass of water is 18 g. The approximate number of water molecules in a glass of water is A. B. C. D. 10 22 . 10 25 . 10 28 . 10 31 .

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–3– 4.

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Both random and systematic errors are present in the measurement of a particular quantity. What changes, if any, would repeated measurements of this quantity have on the random and systematic errors? random A. B. C. D. reduced reduced unchanged unchanged systematic reduced unchanged reduced unchanged

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Turn over

–4– 5.

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A fire-fighting helicopter is flying at constant speed along a horizontal straight-line carrying a bucketofwaterasshowninthediagrambelow.Theropetothebucketmakesafixedanglewith the vertical.

constant speed

rope

bucket of water Which of the following diagrams is the correct free body diagram of the forces acting on the bucket? A. B.

C.

D.

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–5– 6. Sand falls vertically on a conveyor belt at a rate of m kg s–1 .

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v

sand belt

In order to keep the belt moving at constant speed v the horizontal force that must be exerted on the belt is A. B. C. D. mv. 1 2

mv.

mv2.

1 2

mv 2.

7.

Thediagrambelowshowsfivewoodenblocksjoinedbyinelasticstrings.A constant force accelerates theblockstotherightonafrictionlesshorizontaltable. W X Y Z accelerating force table

In which string is the tension the greatest? A. B. C. D. W X Y Z

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Turn over

–6– 8.

N07/4/PHYSI/HPM/ENG/TZ0/XX+ A force of

A force of magnitude F1 accelerates a body of mass m from rest to a speed v. magnitude F2 accelerates a body of mass 2m from rest to a speed 2v. The ratio A. B. C. D. 2. 4. 8. 16. work done by F2 is work done by F1

9.

The centres of two isolated spherical stars each of mass M and radius R are separated by a distance d as shown in the diagram below. M R d X R M

The distance d is very large compared to R. Point X is mid-way between the stars. The gravitational potential at point X due to the two stars is A. − 4GM . d 2GM . R GM . d

B.

−

C. D.

−

zero.

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–7– 10.

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Two satellites, X and Y, move in circular orbits about the Earth. The orbital period of satellite X is eight times that of satellite Y. The ratio A. B. C. D. 2. 4. 8. 16. orbital radius of satellite X is orbital radius of satellite Y

11.

A spacecraft accelerates along a straight-line in outer space under the action of two engines P and Q as shown in the diagram below. engine P

acceleration

engine Q

spacecraft

The engine P fails. Which of the following gives the state of equilibrium of the spacecraft? Translational A. B. C. D. yes yes no no rotational yes no yes no

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Turn over

–8– 12.

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The graph below shows the variation with time t of the acceleration a of a body moving in a straight-line. a

0

0

t1

t2

t

The shaded area represents A. B. C....