Problem 11.11. The low temperature reservoir of a Carnot engine is at 7°C and has an efficiency of 40%. It is desired to increase the efficiency to 50%. By how much degrees the temperature of hot reservoir be increased. m Problem 11.11. The low temperature r…
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Problem 11.10. A heat engine operates between two reservoirs at temperatures of 25°C and 300°C. What is the maximum efficiency for this engine? Problem 11.10 A heat engine opreats between two reservoirs at temperature of 25°c and 300°c. What is the maximum e…
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Problem 11.9. A heat engine performs 200J of work in each cycle and has efficiency of 20 percent. For each cycle of operation a) How much heat is absorbed and b) How much heat is expelled? Problem 11.9 A heat engine perform 200j of works in each cycle and ef…
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Problem 11.8. There is an increase of internal energy by 400 joules when 800 joules of work is done by a system. What is the amount of heat supplied during this process? Problem 11.8 There is an increase of internal energy by 400j when 800j of work is done b…
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Problem 11.7. In a certain process 400 J of heat are supplied to a system and at the sametime 150J of work are done by the system. What Is the increase in the internal energy of the system. Problem 11.7 In a certain process 400j of heat is supplied to a syste…
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Problem 11.6. A 2kg iron block is taken from a furnace where its temperature was 650°C and placed on a large block of ice at 0°C. Assuming that all the heat given up by the iron is used to melt the ice, how much ice is melted. A 2kg iron block is taken from a…
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Problem 11.5. a) Determine the average value of the kinetic energy of the particles of an ideal gas at 0°C and at 50°C: b) What is the kinetic energy per mole of an ideal gas at these temperatures? Problem 11.5 Determine the average value of the kinetic energ…
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Problem 11.4. Calculate the root mean square speed of hydrogen molecule at 800K. DATA: T = 800 K Vrms of H₂ =? K=1.38 x 10^-23 JK-¹ SOLUTION: n=m/M N/NA= m/M 1÷(6.02 x 10^23)=m/2 m = 3.32 x 10^-²4 g. or m = 3.32 x 10^-²7 kg Using Vrms= √(3kT/m) Vrms:√((3 x 1.…
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Problem 11.3. Find the change In volume of an aluminum sphere of 0.4m radius when It is heated from 0 to 100°C. Problem 11.3 Find the change in volume of an aluminium sphere of 0.4m radius when it is heated from0°C to 100 °c? Solution. . V1 = 4/3 3.14 r³ …
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Problem 11.2. A steel rod has a length of exactly 0.2cm at 30°C. What will be Its length at 60°C? A steel rod has a length of exactly 0.2cm at 30 °C what will be Its length at 60°C? Data. Solutions L1 = 0.2cm. …
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Problem 11.1. i) The normal body temperature is 98.4 F. What is this temperature on Celsius scale? ii) At what temperature do the Fahrenheit and Celsius scales coincide. Problem 11.1 The normal human body temperature is 98.4 f. What is temperature of Celsius…
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Problem 10.11. A Galilean telescope has an objective of 120 mm focal length and an eye piece of 50 mm focal length. If the image seen by the eye is 300 mm from the eye piece, what is angular magnification?
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Problem 10.10. An astronomical telescope of angular magnification 1000 has an objective of 15 m focal length. What is the focal length of the eye piece?
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Problem 10.6. Two lenses are in contact, a converging one of focal length 30cm and a diverging one of focal length 10cm. What is the focal length and power of the combination? Data Focal length of first lens.f1 =30cm Focal length of 2nd lens f2 = -10cm To fi…
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Problem 10.1. An object 4 cm tall is placed near the axis of a thin converging lens. If the focal length of the lens is 25 cm, where will the image be formed and what will be the size of the image? Sketch the principal ray diagram... Data Focal length f =25c…
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Problem 9.4. Green light of a wavelength 5400Ã… is diffracted by grating having 2000 line/cm. (a) Compute the angular deviation of the third order image. (b) Is a 10th order image possible?
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Problem 7.8. A rocket of mass 0.200 kg is launched from rest. It reaches a point p lying at a height 30.0 m above the surface of the earth from the starting point. In the process + 425 J of work is done on the rocket by the burning chemical propellant. Ignori…
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Problem 7.7. A body of mass ‘m’ accelerates uniformly from rest to a speed Vy in time ty. Show that the work done on the body as a function of time ‘t’, in terms of Vy and ty, is 1/2m(Vf2/tf2)t2.
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Problem 7.6. A horse pulls a cart horizontally with a force of 40 Ib at an angle 30° above the horizontal and moves along at a speed of 6.0 miles/hr. (a) How much work does the horse do in 10 minutes? (b) What is the power out put of the horse?
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Problem 7.5. A pump is needed to lift water through a height of 2.5 m at the rate of 500 g/min. What must the minimum horse power of the pump be?
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