140902 A stress of $6 \times 10^{6} \mathrm{Nm}^{-2}$ is required for breaking a material. The density $\rho$ of the material is $3 \times 10^{3} \mathrm{~kg} \mathrm{~m}^{-3}$. If the wire is to break under its own weight, the length of the wire made of that material should be (take $g=10 \mathrm{~ms}^{-2}$ )

140905 A rigid bar of mass $15 \mathrm{~kg}$ is supported symmetrically by three wires each $2 \mathrm{~m}$ long. Those at each end are of copper and the middle one is of iron. Determine the ratio of their diameters if each is to have tension.

140906 A wire elongates by $l \mathrm{~mm}$ when a load $w$ is hanged from it. If the wire goes over a pulley and two weights $w$ each are hung at the two ends, the elongation of the wire will be (in $\mathrm{mm}$ ):

140901 Assertion: Stress is the internal force per unit area of a body.
Reason: Rubber is more elastic than steel.

140902 A stress of $6 \times 10^{6} \mathrm{Nm}^{-2}$ is required for breaking a material. The density $\rho$ of the material is $3 \times 10^{3} \mathrm{~kg} \mathrm{~m}^{-3}$. If the wire is to break under its own weight, the length of the wire made of that material should be (take $g=10 \mathrm{~ms}^{-2}$ )

140905 A rigid bar of mass $15 \mathrm{~kg}$ is supported symmetrically by three wires each $2 \mathrm{~m}$ long. Those at each end are of copper and the middle one is of iron. Determine the ratio of their diameters if each is to have tension.

140906 A wire elongates by $l \mathrm{~mm}$ when a load $w$ is hanged from it. If the wire goes over a pulley and two weights $w$ each are hung at the two ends, the elongation of the wire will be (in $\mathrm{mm}$ ):

140901 Assertion: Stress is the internal force per unit area of a body.
Reason: Rubber is more elastic than steel.

140902 A stress of $6 \times 10^{6} \mathrm{Nm}^{-2}$ is required for breaking a material. The density $\rho$ of the material is $3 \times 10^{3} \mathrm{~kg} \mathrm{~m}^{-3}$. If the wire is to break under its own weight, the length of the wire made of that material should be (take $g=10 \mathrm{~ms}^{-2}$ )

140905 A rigid bar of mass $15 \mathrm{~kg}$ is supported symmetrically by three wires each $2 \mathrm{~m}$ long. Those at each end are of copper and the middle one is of iron. Determine the ratio of their diameters if each is to have tension.

140906 A wire elongates by $l \mathrm{~mm}$ when a load $w$ is hanged from it. If the wire goes over a pulley and two weights $w$ each are hung at the two ends, the elongation of the wire will be (in $\mathrm{mm}$ ):

140901 Assertion: Stress is the internal force per unit area of a body.
Reason: Rubber is more elastic than steel.

140902 A stress of $6 \times 10^{6} \mathrm{Nm}^{-2}$ is required for breaking a material. The density $\rho$ of the material is $3 \times 10^{3} \mathrm{~kg} \mathrm{~m}^{-3}$. If the wire is to break under its own weight, the length of the wire made of that material should be (take $g=10 \mathrm{~ms}^{-2}$ )

140905 A rigid bar of mass $15 \mathrm{~kg}$ is supported symmetrically by three wires each $2 \mathrm{~m}$ long. Those at each end are of copper and the middle one is of iron. Determine the ratio of their diameters if each is to have tension.

140906 A wire elongates by $l \mathrm{~mm}$ when a load $w$ is hanged from it. If the wire goes over a pulley and two weights $w$ each are hung at the two ends, the elongation of the wire will be (in $\mathrm{mm}$ ):

140901 Assertion: Stress is the internal force per unit area of a body.
Reason: Rubber is more elastic than steel.