2. Pluto was discovered in 1930. It was classified as a planet. In 2006, scientists agreed that Pluto is not a planet.
a) The diagram below shows our solar system.
Pluto
Neptune
Earth
Venus
(Sun
Mercury
- Mars
Jupiter
Uranus
Saturn
not to scale
i) From the diagram, what supports the idea that Pluto is a planet?
(1 mark)
ii) From the diagram, what supports the idea that Pluto is not a planet?
(1 mark)​

Suppose that a comet that was seen in 563 a.d. by chinese astronomers was spotted again in year 1951. assume the time between observations is the period of the comet and take its eccentricity as 0.986. what are (a) the semimajor axis of the comet's orbit and (b) its greatest distance from the sun?

Describe how the motion of a spring being pushed forward and backward is similar to the motion of air particles in a sound wave.

Asteel tube (k=50 w/mk) of inner and outer diameter di = 20mm and do=26mm, respectively, is used to transfer heat from hot gases flowing over the tube (h-hot = 200w/m2k) to cold water flowing through the tube (h-cold = 8000 w/m2k). what is the cold-side overall heat transfer coefficient uc? to enhance heat transfer 16 straight fins of rectangular profile are installed longitudinally along the outer surface of the tube. the fins are equally spaced around the circumference of the tube, each having a thickness of 2mm and a length of 15mm. what is the corresponding overall heat transfer coefficient uc? *solve for uc in both cases*