Ibdp 2007 Physics Paper

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M07/4/PHYSI/SP3/ENG/TZ1/XX+

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

22076512

physics
sTANDARD level
pApeR 3
Candidate session number

Thursday 3 May 2007 (morning)
0

1 hour

0

INSTRUCTIONS TO CANDIDATES





Write your session number in the boxes above.
Do not open this examination paper until instructed to do so. Answer all of the questions from two of the Options in the spaces provided. At the end of the examination, indicate the letters of the Options answered in the candidate box on your cover sheet.

2207-6512

33 pages
© IBO 2007

http://www.xtremepapers.net
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M07/4/PHYSI/SP3/ENG/TZ1/XX+

Option A — Mechanics extension
A1. Thisquestionisaboutgravitationalfieldstrengthnearthesurfaceofaplanet.

(a)

(i)

Definegravitational field strength.

[2]

.................................................................. .................................................................. (ii)

State why gravitational field strength at a point is numerically equal to the acceleration of free fall at that point.

[1]

.................................................................. .................................................................. .................................................................. (b)

A certain planet is a uniform sphere of mass M and radius R of 5.1 × 106 m. (i)

State an expression, in terms of M and R,forthegravitationalfieldstrengthatthe surface of the planet. State the name of any other symbol you may use. [1]
.................................................................. .................................................................. ..................................................................

(ii)

A mountain on the surface of the planet has a height of 2000 m. Suggest why the valueofthegravitationalfieldstrengthatthebaseofthemountainandatthetopof the mountain are almost equal.

[2]
.................................................................. .................................................................. .................................................................. ..................................................................

(This question continues on the following page)

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(Question A1 continued)
(c)

A small sphere is projected horizontally near the surface of the planet in (b). Photographs of the sphere are taken at time intervals of 0.20 s. The images of the sphere are placed on a grid and the result is shown below.

point of
release

1.00 cm represents 1.00 m

Thefirstphotographistakenattimet = 0. Each 1.00 cm on the grid represents a distance of 1.00 m in both the horizontal and the vertical directions. Use the diagram to
(i)

explain why air resistance on the planet is negligible.

[2]

.................................................................. .................................................................. .................................................................. (ii)

calculate a value for the acceleration of free fall at the surface of the planet.

[3]

.................................................................. .................................................................. .................................................................. .................................................................. (This question continues on the following page)

Turn over

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(Question A1 continued)
(d)

Use your answer to (c)(ii) and data from (b) to calculate the mass of the planet. ....................................................................... ..........................................................................
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