7.
\begin{figure}[h]
\includegraphics[alt={},max width=\textwidth]{84c0eead-0a87-4d87-b33d-794a94bb466c-22_341_316_283_877}
\captionsetup{labelformat=empty}
\caption{Figure 4}
\end{figure}
A simple lift operates by means of a vertical cable which is attached to the top of the lift. The lift has mass \(m\)
A box \(Q\) is placed on the floor of the lift.
A box \(P\) is placed directly on top of box \(Q\), as shown in Figure 4.
The cable is modelled as being light and inextensible and air resistance is modelled as being negligible.
The tension in the cable is \(\frac { 42 m g } { 5 }\)
The lift and its contents move vertically upwards with acceleration \(\frac { 2 g } { 5 }\)
Using the model,
- find, in terms of \(m\), the combined mass of boxes \(P\) and \(Q\)
During the motion of the lift, the force exerted on box \(P\) by box \(Q\) is \(\frac { 14 m g } { 5 }\) Using the model,
- find, in terms of \(m\), the mass of box \(P\)