What are two advantages of burning natural gas to provide energy, compared to burning coal or oil?

The equation that describes a transverse wave on a string is y = (0.0120 m)sin[(927 rad/s)t - (3.00 rad/m)x] where y is the displacement of a string particle and x is the position of the particle on the string. the wave is traveling in the +x direction. what is the speed v of the wave?

True or false: the revolution of the earth creates day and night as it rotates around the sun

If the force applied to an object remains constant, is more power needed for the object to move faster ? explain