Ejercicio 2 Un avión vuela en un círculo horizontal con una velocidad constante de \( 300 \mathrm{~km} / \mathrm{h} \). Si el radio de la curva es de 2 km , calcule: a) El período de revolución del avión. b) La aceleración centrípeta del avión. Recuerda que para resolver estos ejercicios debes aplicar las siguientes fórmulas: - Aceleración centrípeta (ac): ac \( =\mathrm{v}^{\wedge} 2 / \mathrm{r} \) - Fuerza centrípeta (Fc): \( \mathrm{Fc}=\mathrm{m} \mathrm{v}^{\wedge} 2 / \mathrm{r} \) - Período de revolución \( (\mathrm{T}): \mathrm{T}=2 \pi \mathrm{r} / \mathrm{v} \)

QUESTION 7 (Start on a new page.) 7.1 Reflection of light (and other forms of electromagnetic radiation) occurs when the waves meet a surface or other boundary that does not absorb the energy of the radiation and reflects the waves off the surface. Draw a fully labelled ray diagram to illustrate reflection.

QUESTION 6 (Start on a new page.) It has been established that the planet Omega has a moon and that the moon of Omega orbits the planet at a height, above the surface of Omega, which is equal to twice the radius of Omega. The mass of planet Omega is \( 3 \times 10^{15} \mathrm{~kg} \) and the mass of its moon is \( 1.5 \times 10^{13} \mathrm{~kg} \). The radius of the planet Omega is \( 8.5 \times 10^{6} \mathrm{~m} \) and the radius of its moon is \( 2.5 \times 10^{5} \mathrm{~m} \). 6.1 Determine the distance between the centre of the planet Omega and the centre of its moon.

7.2 A beam of light travels from water to plastic. The speed of light in plastic is \( 2,05 \times 10^{8} \mathrm{~m} \cdot \mathrm{~s}^{-1} \). The refractive index of water is 1,33 . Calculate the refractive index of plastic.

An object of mars 5.0 kg moves around a aincle of radius 6.0 m coith a constant speeds of 10 . om/s. Calc-te 1 . angular velocity Centripetal force on the body

8.4 To produce an emf of 9 V , the area of the coil, with its axis coinciding with the direction of a magnetic field (area perpendicular to magnetic field), is halved in 2 minutes from \( 0.6 \mathrm{~m}^{2} \) to \( 0,3 \mathrm{~m}^{2} \). Calculate the number of turns around the coil.