Write the 5 simple things we have to do everyday to maintain a healthy balanced diet?

Why do we have seasons on Earth?

There are energy bands in a solid. Do we have really continous evergy variation in a band or do we have very closely spaced but still discrete energy level ?

The equation of a particle executing simple harmonic motion is x=(5m)sin[(pis^-1)t+pi/3]. Write down the amplitude time period and maximum speed. Also find the velocity at t=1s.

A long string having a cross- sectional area 0.80 mm^2 and density 12.5 g cm^(-3) is subjected to a tension of 64 N along the X-axis. One end of this string is attached to a vibrator moving in transverse direction at a frequency fo 20Hz. At t = 0. the source is at a maximujm displacement y= 1.0 cm. (a) Write the equation for the wave. (b) What is the displacement of the particle of the string at x = 50 cm at time t = 0.05 s ? (c) What is the velocity of this particle at this instant ?