(d) The weight of the beam is 12000 N
Calculate the tension \( T_{1} \) in cable AB and the tension \( T_{2} \) in cable AC .
\[
\begin{array}{l}
T_{1}=\quad \mathrm{N} \\
T_{2}=\quad \mathrm{N}
\end{array}
\]
(4)
(e) The steel cable from the crane has a circular cross-section of diameter \( 1.5 \times 10^{-2} \mathrm{~m} \) The cable is 12 m long.
Calculate the extension of the cable caused by the weight of the beam. You can assume that the weights of all cables are negligible.
Young modulus of steel \( =2.0 \times 10^{11} \mathrm{~Pa} \)
extension \( = \)
\( \qquad \) m
2.
(a) Figure 1 shows an incident ray of light being partially reflected at the boundary between glass \( \mathbf{A} \) and glass \( \mathbf{B} \). The refractive index \( n_{A} \) of glass \( \mathbf{A} \) is 1.461
The speed of light in glass B is \( 3.252 \% \) less than the speed of light in glass \( \mathbf{A} \).
Surbiton High School
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