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PAPER TITLE: PHYSICS AND SPACE
EXAM DATE: THURSDAY 20, SEPTEMBER 2018
COURSE CODE: SM123/A
ANSWER( Purchase full paper to get all the solutions)
1)
following the newton third law of motion:
mgsinθ is equal to the frictional force (μN)
the normal reaction is equal to mgcosθ
mg is the weight of the block.
(b) Assuming that air resistance and other frictional forces are negligible, use the conservation of energy to calculate the speed of the ball at point B.
(c) What height will the ball reach on the other side of its swing? Justify your answer.
(b) Sketch the electron shell structure of this isotope.
c) Potassium (K) has atomic number 19 and Chlorine (Cl) has atomic number 17. Briefly explain how these atoms transfer electrons to form the ionic compound potassium chloride, KCl, noting the electron shell structure of the resulting ions.
(b) Convert the photon energy into joules.
(c) What is the corresponding frequency of this photon?
(b) If the speed of the Honda Civic increases to 36 m s-1 (i.e. about 80 miles per hour), by what factor will the power dissipated by air resistance increase?
(c) Which of the cars is the least aerodynamic in design? Briefly explain your reasoning to justify your answer.
(b) How may the process be understood at the level of individual nucleons? How may it be understood at the level of individual quarks?
(c) What type of boson is created when a quark changes flavour in this process? Name the two particles emitted when the boson decays
(b) How many million years does it take a star situated 60,000 light years from the centre of the galaxy to complete one circular orbit of the galaxy?
(c) What is implied by the fact that the rotation curve does not decrease at large distances from the centre of the galaxy?
(b) One of the gaps occurs at an orbital period of 4.74 years. According to Kepler’s 3rd law, what would be the semi-major axis corresponding to such an orbit? (The orbital period of the Earth is 1 year, and its orbit has a semimajor axis of 1 AU.)
(c) By selecting which orbital resonance this orbit corresponds to from the graph above, what is the orbital period of Jupiter?
(b) What is the apparent recession speed of the galaxy in km s-1?
(c) If the Hubble constant is 65 kms-1 Mpc-1, how far away is the galaxy in Mpc?
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Last updated: Sep 02, 2021 10:47 AM
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