The drag coefficient $$$C_{d}$$$ is a number with no units. It is used to compare the drag on different cars at different speeds. $$$C_{d}$$$ is given by the equation where $$$F$$$ is the drag force on the car, $$$\rho$$$ is the density of the air, $$$A$$$ is the cross-sectional area of the car and $$$v$$$ is the speed of the car. What is the value of $$$n$$$ ?

Physics

IGCSE&ALevel

CAIE

Exam No：9702_s18_qp_12 Year：2018 Question No：2

Answer:

Knowledge points:

1.1.1 understand that all physical quantities consist of a numerical magnitude and a unit.

1.1.2 make reasonable estimates of physical quantities included within the syllabus

1.2.1 recall the following SI base quantities and their units: mass (kg), length (m), time (s), current (A), temperature (K), amount of substance (mol)

1.2.2 express derived units as products or quotients of the SI base units and use the named units listed in this syllabus as appropriate

1.2.3 use SI base units to check the homogeneity of physical equations

1.2.4 use the following prefixes and their symbols to indicate decimal submultiples or multiples of both base and derived units: pico (p), nano (n), micro (μ), milli (m), centi (c), deci (d), kilo (k), mega (M), giga (G), tera (T)

1.2.5 understand and use the conventions for labelling graph axes and table columns as set out in the ASE publication Signs, Symbols and Systematics (The ASE Companion to 16–19 Science, 2000)

Answer:

Knowledge points:

Solution:

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