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PAPER TITLE: PHYSICS AND SPACE

EXAM DATE: THURSDAY 13, JUNE 2019

COURSE CODE: SM123/H

(b) Calculate the magnitude of the electrostatic force between the particles.

(c) State two ways that the magnitude of the force could be decreased by a factor of nine, by changing either the separation of the particles or their charges.

ANSWER (Purchase full paper to get all the solutions)

1a)

The force between the two particles will be directed towards each other because the two particles are of opposite charges.

1b)

1c)

The two ways by which the magnitude of the force be reduced by a factor of nine.

By changing the charges to 2 respectively.

By changing the separation of the particles to 27nm

(b) The stretched surface of the trampoline contracts and the trampolinist is pushed vertically upwards. At a certain time, when her upwards speed is 5.0 ms−1, she loses contact with the surface. Calculate her kinetic energy at this time. 

(c) At a later time, the trampolinist reaches her maximum height. What will be her speed at this point and what form is the energy now in? 

(d) Calculate the maximum possible distance the trampolinist can travel upwards after the point at which she loses contact with the surface. 

(b) The stretched surface of the trampoline contracts and the trampolinist is pushed vertically upwards. At a certain time, when her upwards speed is 5.0 ms⁻¹, she loses contact with the surface. Calculate her kinetic energy at this time.

(c) At a later time, the trampolinist reaches her maximum height. What will be her speed at this point and what form is the energy now in?

(d) Calculate the maximum possible distance the trampolinist can travel upwards after the point at which she loses contact with the surface.

(b) In diamond, how many other atoms is each atom bonded to?

(c) Briefly describe the structure of graphite. How many other atoms is each atom bonded to in this case? Why does this allow graphite to conduct electricity?

(b) What name is given to the fourth quantum number for an electron, and what values may it have?

(c) State the maximum number of electrons that a 3d orbital may contain and briefly explain what principle of quantum mechanics ensures this.

(b) The mass of a uranium-235 nucleus is 3.903 × 10⁻²⁵ kg and the mass of a neutron is 1.675 × 10⁻²⁷ kg. The masses of the xenon and strontium nuclei are 2.180 × 10⁻²⁵ kg and 1.493 × 10⁻²⁵ kg. What is the difference in mass between the reactants and the products of this fission process?

(c) Show that 12 GeV of energy is released by each instance of this fission process.

(a) The image in Figure 7 shows the elliptical galaxy, NGC3226 and the spiral galaxy, NGC3227. In a sentence for each, describe the three-dimensional distribution of stars in each of these types of galaxy.

(b) The two galaxies shown are both 75 million light years away, and their centres are separated by an angular distance of 0.033°. Calculate the distance between the centres of the two galaxies in light years and hence state how long it would take for a light signal to travel between them.

(b) Briefly explain how achondrite meteorites differ from chondrite meteorites and what their compositions are.

(c) How should a microscope be used in order to best observe the presence of metal grains in a meteorite thin section that are not transparent to light?

(b) A slightly cooler star with a temperature of 2500 K also has a blackbody spectrum. Sketch the spectrum of this star on Figure 9.

(c) The Cosmic Microwave Background radiation has a blackbody spectrum corresponding to a temperature of 2.7 K. State quantitatively how the wavelength at which this spectrum has its peak compares to the wavelength at which the spectrum of the cool star shown in Figure 9 has its peak.

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Last updated: Sep 02, 2021 10:06 AM