The speed $v$ of a wave travelling a wire is given by the equation $v={\left(\frac{Tl}{m}\right)}^n$.

Where $\mathrm{T}$ is the tension in the wire that has mass $\mathrm{m}$ and length $\mathrm{l}$. In order for the equation to be homogeneous, what is the value of $\mathrm{n}$ ?

A metal ball is dropped into a tall cylinder of oil. The ball initially accelerates but soon reaches a terminal velocity. By considering the forces on the metal ball bearing, explain why it first accelerates but then reaches terminal velocity.

A metal ball is dropped into a tall cylinder of oil. The ball initially accelerates but soon reaches a terminal velocity. State how you would show that the metal ball reaches terminal velocity. Suggest one cause of random errors in your readings.

Determine the speed in $\mathrm{m} {\mathrm{s}}^{-1}$ of an object that travels:

$3.0 \mu \mathrm{m}$ in $5.0 \mathrm{m} \mathrm{s}$

Determine the speed in $\mathrm{m} {\mathrm{s}}^{-1}$ of an object that travels:

 $6.0 \mathrm{km}$ in $3.0 \mathrm{Ms}$

Determine the speed in $\mathrm{m} {\mathrm{s}}^{-1}$ of an object that travels:

 $8.0 \mathrm{pm}$ in $4.0 \mathrm{ns}$.

The diagram shows a man who is just supporting the weight of a box. Two of the forces acting are shown in the diagram. According to Newton's third law, each of these forces is paired with another force.

For $\mathrm{a}$ the weight of the box, and $\mathbf{b}$ the force of the ground on the man.State the body on that the other force acts upon.

The diagram shows a man who is just supporting the weight of a box. Two of the forces acting are shown in the diagram. According to Newton's third law, each of these forces is paired with another force.

For $\mathrm{a}$ the weight of the box, and $\mathbf{b}$ the force of the ground on the man. State the direction of the other force acting on the system.

The diagram shows a man who is just supporting the weight of a box. Two of the forces acting are shown in the diagram. According to Newton's third law, each of these forces is paired with another force.

For $\mathrm{a}$ the weight of the box, and $\mathbf{b}$ the force of the ground on the man. Sate the type of forces involved.