Part A Stick a fork into each end of the root vegetable as shown. The fork should be
on the same side of the vegetable, and slightly angled away from each other. Play some fort vegetable on the edge of a box or thin wall with the forks hanging down. Does the fourth vegetable balance in the position? Is there any position that works better than the other? Explain
Part B
Consider this question posed at the beginning of the task:
Does Earth’s gravitational force field act on objects that aren’t touching Earth’s surface?
Did the investigation answer the question? Explain whether it gave enough evidence to support the idea
that an invisible gravitational force field exists.
Part C
How might someone dispute the results of your investigation? How might you counter the argument
Part D
What would improve the investigation design or procedures?

multiply 2kg by latent heat of vap

scattering of light by tiny particles in air to produce the colors we see on sky, is dependent on the following factors:

(i) wavelength of light

(ii) size of the scattering particle  

(iii) distance traveled by light through the atmosphere.

according to rayleigh's law of scattering, the amount of scattering is inversely proportional to the fourth power of its wavelength. shorter the wavelength, greater is its scattering. hence violet/blue light is scattered more than red.

sun's light is a composite light ( visible light) with wavelengths in the range 400 nm (violet) to 700 nm (red). as sunlight passes through our atmosphere, the molecules of air scatter light according to their wavelengths. during sunrise and sunset, the sun's position is below the horizon. hence light from the sun travels a greater distance in the atmosphere when compared to its position a noon.

as sunlight enters the earth's atmosphere, blue light is scattered away and at the end of its journey in the sky, only red and orange wavelengths remain in the beam.

hence at sunrise and sunset, the sky appears reddish orange.