7. Problem Why does a perfect reflector exert twice the radiation pressure on a surface compared...
problem #4 #7
4. Problem A long wire is bent to form a rectangular section and is placed in a region with a uniform magnetic id, as shown in Fig ure 27.4. The magnetic field is directed downward and has a magnitude of 2.5T. The wire carries a 25- A current. Find the net torque on the wire about the z-axis. 025m 5. Problem Figure 29.2 shows a stationary current loop next to a long, straight wire carrying a current...
The intensity of sunlight hitting the earth is about 1300 W/m2. If sunlight strikes a perfect absorber, what pressure does it exert? How about a perfect reflector? What fraction of atmospheric pressure does this amount to?
white, perfectly reflecting surface, it exerts a 4. (10) When an radiation pressure p on that surface. If the surface is now painted a perfectly absorbing black, what will be the radiation pressure that the same ware will exert on the surface? electromagnetic ware falls on a (e) p (a) p/4 (b) P/2 (d) -p
Ex. 7.1 — The radiation pressure from the sun at the surface of the earth is only 6 uPa. Calculate the RMS amplitude of the electric field component of a monochromatic electromagnetic wave that would exert such a pressure. (Monochromatic = single frequency).
Q2- Why does a monopoly result in a loss of efficiency compared to a perfect competition framework? Can you think of a government policy which would result in a loss of efficiency?
Why does the U.S spend twice the money on healthcare per person compared to other countries?
Problem 2: A small surface A1, with area 7 cm2, emits radiation as a blackbody at 800K. Part of its radiation hits another small surface A2, with area 7 cm2, which is oriented as shown in the figure below. (a) Determine the solid angle of A2 as viewed from Aı. (b) Determine the radiation heat transfer rate (in W) from A1 to A2. Hint: you can assume the surfaces are small relative to their separation distance Problem2 02-60A2 r-80 cm...
Constants In this example we will investigate the viability of using radiation pressure to propel a spacecraft. Suppose a spacecraft with a mass of 2.50 x 10 kg has a solar sail made of perfectly reflective aluminized film with an area of 2.59 x 106 m2 (about 1 square mile). If the spacecraft is launched into earth orbit and then deploys its sail at right angles to the sunlight, what is the acceleration due to sunlight? (At the earth's distance...
Pressure problems Problem #2 (a) What is the absolute pressure 30 m below the surface of the sea? (b) At what depth below the surface of the sea is absolute pressure three times atmospheric pressure? (c) The density of mercury is mere = 13,600 kg m what is the gauge pressure under ten metres of mercury? (d) At what depth of mercury would the absolute pressure be twice atmospheric pressure? Solution
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...