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Wave length and amplitude

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A wave on a string is described by the following equation (assume the +x direction is to the right).
y = (11 cm) cos[πx/(4.4 cm) + π t/(12 s)]
(a) What is the amplitude of this wave?
(b) What is its wavelength?
(c) What is its period?
_______ s
(d) What is its speed?
(e) In which direction does the wave travel?
___to the left
___to the right

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The wave length and amplitude is analyzed for a string following equations.

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Fundamental Principle : As an object is taken away from the surface of earth, work has to be done to overcome the gravitational pull between the two. This work done is stored in the system as its potential energy. Thus, the difference in the gravitational potential energy at the given height and at the surface of earth is equal to the work done in taking the object to the given height.

a) Gravitational PE of an object of mass m at a distance r from the centre of earth (mass M) is given by : U = ...

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