what is the Physicists recognize four fundamental forces. * - Flectrical force - Gravitational force Strong nuclear force - Weak nuclear force Muscular force Force of friction Ff is described by • Ff = µN O u synovlal fluld in the joints u coefficient of fraction between two surface in The temperature of the human body is normally about 98.6 F.calculate the temperature of the body °C oC = (5/9)x(oF-32) =5/9(98.6- 32)-37 oC oc=(9/5)x(of -32) =9/5(98,6-32) =13,3

what is the Physicists recognize four fundamental forces. * - Flectrical force - Gravitational force Strong nuclear force - Weak nuclear force Muscular force Force of friction Ff is described by • Ff = µN O u synovlal fluld in the joints u coefficient of fraction between two surface in The temperature of the human body is normally about 98.6 F.calculate the temperature of the body °C oC = (5/9)x(oF-32) =5/9(98.6- 32)-37 oC oc=(9/5)x(of -32) =9/5(98,6-32) =13,3

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter1: Basic Modes Of Heat Transfer

Section: Chapter Questions

Problem 1.22P: 1.22 In order to prevent frostbite to skiers on chair lifts, the weather report at most ski areas...

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1.22 In order to prevent frostbite to skiers on chair lifts, the weather report at most ski areas gives both an air temperature and the wind-chill temperature. The air temperature is measured with a thermometer that is not affected by the wind. However, the rate of heat loss from the skier increases with wind velocity, and the wind-chill temperature is the temperature that would result in the same rate of heat loss in still air as occurs at the measured air temperature with the existing wind. Suppose that the inner temperature of a 3-mm-thick layer of skin with a thermal conductivity of 0.35 W/m K is and the air temperature is . Under calm ambient conditions the heat transfer coefficient at the outer skin surface is about (see Table 1.4), but in a 40-mph wind it increases to . (a) If frostbite occurs when the skin temperature drops to about , do you advise the skier to wear a face mask? (b) What is the skin temperature drop due to the wind?
dated metncpdf Thermodynamics An Engineering X E Module2-chap2propertiesofpure x O File C:/Users/DANIEL/Desktop/300L%202ND%20SEMESTER%20MATERIALS/Module2-chap2propertiesofpuresubstances-130703012604 phpap. ID Page view A Read aloud V Draw H Highlight O Erase 40 MEC 451 - THERMODYNAMICS Faculty of Mechanical Engineering, UITM Supplementary Problems The pressure in an automobile tire depends on the temperature of the air in the tire. When the air temperature is 25°C, the pressure gage reads 210 kRa. If the volume of the tire is 0.025 m3, Cetermine the pressure rise in the tire when the air temperature in the tire rises to 50°C. Also, determine the amount of air that must be bled off to restore pressure to its original value at this temperature. Assume the atmospheric pressure is 100 kPa. [ 26 kPa, 0.007 kg] 1. A 6 4 2:57 PM Lucky CORER 144 Tum lock 314 % 8 1/2 24 6 1/4 23 T K F pause B
M Inbox - wep10@zips.uakron.edu O My Akron Experience - The Univ B Homepage - Statics 801 O Pearson MyLab and Mastering b The equivalent resultant force, di x Course Home A https://openvellum.ecollege.com/course.html?courseld=16245503&OpenVellumHMAC=67fab398401alafde96db3b49e605db9#10001 O My Courses KAssignment 10o Course Home Problem 4.137 3 of 4 Syllabus I Review Scores Replace the three forces acting on the plate by a wrench. Suppose that FA = {450i}N, FB = {-350k} N, and Fc = {300j} N. (Figure 1) Part B eТext Determine the couple moment of the wrench. Express your answer to three significant figures and include the appropriate units. Enter positive value if the sense of direction of the couple moment is the same as that of the resultant force and negative value if the sense of direction of the couple moment is opposite to that of the resultant force. Study Area Document Sharing TH HẢ ? User Settings Value Units Course Tools > Submit Previous Answers Request Answer X Incorrect; Try…
The left side of this equation tells how much energy Q the cylinder gives to the water while it cools. The right side of this equation tells how much energy Q the water and aluminum cup absorb from the cylinder to warm up. Because it is the same energy, they are equal. What is known in this equation? Mcyl 411.7 g, malum 46.5 g, malum+water = 175 g Can you find: mwater =? g Twater = Talum = 20°C (water and cup of room temperature) 90°C, T; = 35°C (hot cylinder and cool "cylinder+cup+water" temperatures) Tcyl kCal Calum = 0.22, Cwater 1 (specific heat of water and aluminum, measured in units kg-°C What are we looking for is Ccul - How we find it? Plug all the numbers into the equation (1), Ccul will be one unknown which you can calculate from the equation. Important, convert all the masses from grams to kilograms! After you find Ccyl, compare it to known value for the copper 0.093(our cylinder is made out of copper). |Ceyl -0.093| % : · 100% 0.093
1:19 ul 4G A Ims.uop.edu.jo Question 4 Not yet answered Marked out of 3.00 P Flag question In the Figure shown, three forces applied to a box of mass m = 6.0 kg that moves rightward by 18.0 m over a frictionless floor. The forces are F,=4.0 N, F2 = 30.0 N, and F3= 5.0 N, and the indicated angle is O= 50.0°. If the initial velocity of the box is zero, its final velocity at the end of the dislacement is a) 5.32 m/s, b) 4.65 m/s, c) 6.57 m/s, d) 9.58 m/s, e)10.09 m/s. Select one: a b PREVIOUS PAGE NEXT PAGE
Completely solve and box the final answer. Write legibly 1. How much heat will be transferred in KW if a hot gas at 175ºC crosses a wall 100-mm thick and cross-sectional dimensions of 25 cm x 52 cm. It leaves the wall at 52ºC. The thermal conductivity of the wall is 12.4 W/m-ºK?
The wall (thickness L) of a furnace is comprised of brick material (thermal conductivity, k = 0.2 Wm¯' K'). Given that the atmospheric temperature is 0°C at both sides of wall, the density (p) and heat capacity (c) of the brick material are 1.6 gm cm³ and 5.0 J kg K¯l respectively. du Solve pc = k- subject to initial conditions as u(x,0) = x²(L – x). ốt Consider the case 2=- p² only.
re | https://eagleonline.hccs.edu/courses/156500/quizzes/969413/take Question 39 5 pts Perform the following temperature unit conversions: (a) Convert a temperature of 52°C to 'F °R, and K. (b) Convert a temperature of -40°F to °C, K, and °R. Relevant formulae are given below T (°C) = T (K) - 273.15 T ('F) = T (°R) - 459.67 T(F) = 1.8T (°C) + 32 Upload Choose a File 5 pts tion 40
To maximize production and minimize pumping costs, crude oil is heated to reduce its viscosity during transportation from a production field. (1) Consider a pipe-in-pipe configuration consisting of concentric steel tubes with an intervening insulating material. The inner tube is used to transport warm crude oil through cold ocean water. The inner steel pipe (k, = 45 W/m-K) has an inside diameter of D;, 1 150 mm and wall thickness f; = 20 mm while the outer steel pipe has an inside diameter of D; 2 = 250 mm and wall thickness t, = tị. Determine the maximum allowable crude oil temperature to ensure the polyurethane foam insulation (k, between the two pipes does not exceed its maximum service temperature of Tp. max = 70°C. The ocean water is at T.0 = -5°C and provides an external convection heat transfer coefficient of h. flowing crude oil is h; = 450 W/m²-K. 0.03 W/m-K) 500 W/m2-K. The convection coefficient associated with the (2) It is proposed to enhance the performance of the…
A house wall is composed of 3 layers in series to each other. There is an Aluminum layer that is 4 cm thick, Copper layer that is 6 cm think and Gold layer that is 3 cm thick. What is the total conductivity of the wall and its R-value in units of ft2.F.hr/Btu? [KAl = 2.37 W/cm.C, KCu = 4.01 W/cm.C, KAu = 3.17 W/cm.C]
Conduction Heat Transfer X material (a) material (b) . both (a) and (b) have the same thermal conductivity the temperature distribution is independent of thermal conductivity it's not that simple 9. Fin efficiency is defined as: • tanh (mL) (hP/k Ac)1/2 (heat transfer with fin) / (heat transfer without fin) (actual heat transfer through fin) / (heat transfer assuming all fin is at T = Tb) (Tx=L-Tf)/(Tb-Tf) 10. For an infinite fin, the temperature distribution is given by: (T-Tf)/(Tb-Tf)= e-mx. The heat flow through the fin is therefore given by: k (Tb-Tf)/L ● zero, because the fin is infinite ● infinite because the fin is infinite ● (Tb-Tf) (hP/k Ac)1/2 ● (Tb – Tf) (h P / k Ac)1/2 tanh (mL) 11. The Biot number, Bi, is defined as: • Bi=hk/L • Bi=hL/k • Bi= k/LH • Bi=qL/k • Bi=p UL/k 12. For a plate of length L, thickness, t, and width, W, subjected to convection on the two faces of area L x W. What is the correct length scale for use in the Biot number? . L ● W ● t • t/2 • L/2 13. If Bi…
one: O True O False 1. A student of mass 50 kg caries a bag weighing 4000g from the ground floor to his class on the first floor that is 900 cm high. The work done by the boy is = https://mo- Po all EN hp 144