Physics 9702/21 — October/November 2010

Cambridge AS Level · AS Level Structured Questions · worked solutions for every part, with the mark scheme

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Topics Dynamics · Electricity · Physical Quantities and Units · Kinematics · Forces, Density and Pressure · Deformation of Solids · +3 more

Q1Physical Quantities and UnitsFree sample

Answer all the questions in the spaces provided.

(a)

Two of the SI base quantities are mass and time. State three other SI base quantities.

(b)

A sphere of radius $r$ is moving at speed $v$ through air of density $\rho$ . The resistive force $F$ acting on the sphere is given by the expression

F = Br^2\rho v^k

where $B$ and $k$ are constants without units.

(i)

State the SI base units of $F$ , $\rho$ and $v$ .

$F$ ______
$\rho$ ______
$v$ ______

(ii)

Use base units to determine the value of $k$ .

$k$ = ______

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