Physics 9702/23 — October/November 2017

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

questions

marks

minutes

Topics Work, Energy and Power · Dynamics · Physical Quantities and Units · Forces, Density and Pressure · Waves · Electric Fields · +3 more

Q1Work, Energy and PowerPhysical Quantities and UnitsFree sample

Answer all the questions in the spaces provided.

(a)

(i)

Define power.

(ii)

Show that the SI base units of power are $\text{kg m}^2\ \text{s}^{-3}$ .

(b)

All bodies radiate energy. The power $P$ radiated by a body is given by

P = kAT^4

where $T$ is the thermodynamic temperature of the body,
$A$ is the surface area of the body
and $k$ is a constant.

(i)

Determine the SI base units of $k$ .

base units = ______

(ii)

On Fig. 1.1, sketch the variation with $T^2$ of $P$ . The quantity $A$ remains constant.

Fig. 1.1

The rest of this paper

6 more questions

Loading the full paper…