(a)
Explain, with the aid of a sketch or diagram, why the Earth experiences tides and why the interval between one high tide and the next is about 12.4 hours.
(4 marks)
(a) Explain, with the aid of a sketch or diagram, why the Earth experiences tides and...
(b) Explain, with the aid of a sketch or diagram, why the tidal range at a particular location varies over the time period of a lunar cycle. (2 marks)
d) With the aid of a sketch, explain why connecting solar cells directly to a motor is usually unwise. a) With the aid of a diagram, explain how and why an optical isolator is employed in the gate of a voltage driven device. e With the aid of a diagram, explain how DAG systems can make a power network more unstable d) With the aid of a sketch, explain why connecting solar cells directly to a motor is usually unwise....
Question 2 a. With the aid of a diagram, explain why monopoly is regarded inefficient compared to perfectly competitive market. [5 marks b. hat are the FOUR (4) ways that government policymakers can respond to the problem of monopoly firm? 4 marks] c. What characteristics does monopolistic competition have in common with monopoly and perfect competition? 4 marks] d. How does the long-run equiibrium in monopolistic competition differ from the long-run equilibrium in perfect competition? Is the long-run equilibrium in...
Explain with the aid of a diagram why a Zener diode is not suitable to act as a stable reference voltage.
(20 Marks) QUESTION With the aid of a fully labelled diagram, draw a Production Possibility Frontier (PPF) for an economy producing computers and pizzas. Use the diagram to explain the concepts of choice, scarcity and opportunity costs. (10 marks) 4.1 2 With reference to the diagram in question 4.1, distinguish between 'efficiency' and 'inefficiency. (4 marks) With the aid of a separate diagram, illustrate and explain what would happen if there was a discovery of an improved technique for producing...
Q5. With the aid of a spacetime diagram illustrate the following terms: past light cone, ii. future light cone, iii. worldline of a relativistic particle. When is a spacetime interval described as: timelike, (2 marks) ii. spacelike, (2 marks) iii. lightlike? (2 marks) A jet is flying at 900ms−1 relative to the ground. How much time must elapse before a clock in the jet and one on the ground differ by 2.00s? (4 marks) How fast must a spacecraft...
1.(a)Explain the differences between conduction and valence band with the aid of an energy diagram (b)Mention seven differences between charge and current (c)Explain why ammeters are connected in series but not parallel (d)Explain why always a voltmeter is connected in parallel but not in series
2. With the aid of a chemical potential versus temperature phase diagram, explain why graphite sublimes rather than melts when it is heated from 300 K to 3825 K at standard pressure. Also draw a pT phase diagram that is compatible with this observation.
With the aid of a diagram explain how a monopolist determines how much output to produce and what price to charge. (2) Briefly describe price discrimination of the first, second and third degrees. (3) Explain the difference between the demand curve facing a monopoly and the demand curve facing a perfectly competitive firm (4) Explain why under monopoly, price is greater than marginal revenue, while under perfect competition, price is equal to marginal revenue.
Question One a) With the aid of appropriate sketches, explain how the following factors influence material creep behaviour i. ii. iii. iv. Exposure time Applied mechanical load. Exposure temperature and Material mechanical properties, [4 marks] b) In a typical creep test, load level (typically below material yield strength) and temperature are kept constant while specimen deformation is monitored with time. From the deformations, strains are computed and plotted as a function of time. Three (3) stages may typically be observed....