I have submitted this question yesterday and half of it is wrong as shown below. I am not sure why I couldn't return the question back to tutors....

A sinusoidal wave is traveling on a rope with a constant speed v. The displacement of the particles of the string at position x = 20 cm varies with time according the following function: y = 7cm . sin(19rad - 130 . t), The density of the rope is 25 g/cm. Time is measured in seconds. If the wave equation is of the form y = ym . sin( k . x t w . t), what are: The amplitude, ym = 7 Units cm v The wave vector, k = 19 x Units Select an answer The angular frequency, w = 130 Units rad/s The wave speed, v = 6.842 x Units cm/s The sign in front of w is negative The tension in the rope, T = 1170.8 x Unit v Select an answer rad/s The direction of the wave propagation: the rad N Question Help: ) Message instructor D rad/cm m/s kg Submit Question Hz cm S no units requiredA sinusoidal wave is traveling on a rope with a constant speed v. The displacement of the particles of the string at position x = 20 cm varies with time according the following function: y = 7cm . sin(19rad - 130 . t), The density of the rope is 25 g/cm. Time is measured in seconds. If the wave equation is of the form y = ym . sin(k . x tw . t), what are: The amplitude, ym = 7 Units cm The wave vector, k = 19 X Unit v Select an answer rad rad/s The angular frequency, w = 130 kg v Hz The wave speed, v = 6.842 x Unit N cm/s S The sign in front of w is negative rad/cm cm The tension in the rope, T = 1170.8 no units required ver v The direction of the wave propagation: the positive x-direction Question Help: ) Message instructor D Post to forum Submit