Physics for Scientists and Engineers
6th Edition
ISBN: 9781429281843
Author: Tipler
Publisher: MAC HIGHER
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Chapter 17, Problem 3P
To determine
The coldness of the room.
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(a) Suppose a meter stick made of steel and one made of invar are the same length at 0°C. What is their difference in length at 42.5°C? The coefficient of thermal expansion is 12 x 10-6/°C for steel
and 0.9 x 10-6/°C for invar.
mm
(b) Repeat the calculation for two 16.0-m-long surveyor's tapes.
mm
A steel bridge is built in the summer when its temperature is 33.5 ∘C. At the time of construction, its length is 80.65 m.
a)How much does the length of the bridge change on a cold winter day when its temperature is -12.0 ∘C?
A window glass 0.50-cm thick has dimensions of 3.0 m by 1.5 m. If the outside temperature is -10°C and the inside temperature is 20°C, how much heat flows through the window in one hour by conduction only? (k of glass = 0.84 J/s·m·C°)
a. 55 MJ
b. 64 MJ
c. 73 MJ
d, none of the above
Chapter 17 Solutions
Physics for Scientists and Engineers
Ch. 17 - Prob. 1PCh. 17 - Prob. 2PCh. 17 - Prob. 3PCh. 17 - Prob. 4PCh. 17 - Prob. 5PCh. 17 - Prob. 6PCh. 17 - Prob. 7PCh. 17 - Prob. 8PCh. 17 - Prob. 9PCh. 17 - Prob. 10P
Ch. 17 - Prob. 11PCh. 17 - Prob. 12PCh. 17 - Prob. 13PCh. 17 - Prob. 14PCh. 17 - Prob. 15PCh. 17 - Prob. 16PCh. 17 - Prob. 17PCh. 17 - Prob. 18PCh. 17 - Prob. 19PCh. 17 - Prob. 20PCh. 17 - Prob. 21PCh. 17 - Prob. 22PCh. 17 - Prob. 23PCh. 17 - Prob. 24PCh. 17 - Prob. 25PCh. 17 - Prob. 26PCh. 17 - Prob. 27PCh. 17 - Prob. 28PCh. 17 - Prob. 29PCh. 17 - Prob. 30PCh. 17 - Prob. 31PCh. 17 - Prob. 32PCh. 17 - Prob. 33PCh. 17 - Prob. 34PCh. 17 - Prob. 35PCh. 17 - Prob. 36PCh. 17 - Prob. 37PCh. 17 - Prob. 38PCh. 17 - Prob. 39PCh. 17 - Prob. 40PCh. 17 - Prob. 41PCh. 17 - Prob. 42PCh. 17 - Prob. 43PCh. 17 - Prob. 44PCh. 17 - Prob. 45PCh. 17 - Prob. 46PCh. 17 - Prob. 47PCh. 17 - Prob. 48PCh. 17 - Prob. 49PCh. 17 - Prob. 50PCh. 17 - Prob. 51PCh. 17 - Prob. 52PCh. 17 - Prob. 53PCh. 17 - Prob. 54PCh. 17 - Prob. 55PCh. 17 - Prob. 56PCh. 17 - Prob. 57PCh. 17 - Prob. 58PCh. 17 - Prob. 59PCh. 17 - Prob. 60PCh. 17 - Prob. 61PCh. 17 - Prob. 62PCh. 17 - Prob. 63PCh. 17 - Prob. 64PCh. 17 - Prob. 65PCh. 17 - Prob. 66PCh. 17 - Prob. 67PCh. 17 - Prob. 68PCh. 17 - Prob. 69PCh. 17 - Prob. 70PCh. 17 - Prob. 71PCh. 17 - Prob. 72PCh. 17 - Prob. 73PCh. 17 - Prob. 74PCh. 17 - Prob. 75PCh. 17 - Prob. 76PCh. 17 - Prob. 77PCh. 17 - Prob. 78PCh. 17 - Prob. 79PCh. 17 - Prob. 80P
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- The thermal conductivities of human tissues vary greatly. Fat and skin have conductivities of about 0.20 W/m K and 0.020 W/m K, respectively, while other tissues inside the body have conductivities of about 0.50 W/m K. Assume that between the core region of the body and the skin sin face lies a skin layer of 1.0 mm, fat layer of 0.50 cm, and 3.2 cm of other tissues. (a) Find the R-factor for each of these layers, and the equivalent R-factor for all layers taken together, retaining two digits. (b) Find the rate of energy loss when the core temperature is 37C and the exterior temperature is 0C. Assume that both a protective layer of clothing and an insulating layer of unmoving air a absent, and a body area of 2.0 m2.arrow_forwardWhat mass of water at 25.0C must be allowed to conic to thermal equilibrium with a 1.85-kg cube of aluminum initially at 1.50 102C to lower the temperature of the aluminum to 65.0C? Assume any water turned to steam subsequently recondenses.arrow_forwardA long steel I-beam used in bridge construction has a length of 15.0 m. The beam may be exposed to temperatures as low as −15°C in the winter and as high as 34°C in the summer. What is the difference in length of the beam between these two temperature extremes? (Give the absolute value of the difference. Enter your answer in mm.)arrow_forward
- In memory of conditions in the trenches of World War I a century ago, estimate the heat flow from a human standing in leather boots on cold ground. You may approximate the feet as rectangles 25 cm long by 10 cm wide, and that heat leaves only through the boots' soles, which are 1.5 cm thick. The thermal conductivity of leather is 0.16 W °C−1 m−1, and the temperature of the ground is 0 °C. Use 26 °C as the temperature of the feet inside the boots.arrow_forwardLong aluminum wires of diameter 5 mm (r = 2702 kg/m3 and cp = 0.896 kJ/kg·°C) are extruded at a temperature of 350°C and are cooled to 50°C in atmospheric air at 25°C. If the wire is extruded at a velocity of 8 m/min, determine the rate of heat transfer from the wire to the extrusion room.arrow_forwardAn 8-m-internal-diameter spherical tank made of1.5-cm-thick stainless steel (k = 15 W/m·K) is used to storeiced water at 0°C. The tank is located in a room whose temperatureis 25°C. The walls of the room are also at 25°C.The outer surface of the tank is black (emissivity « = 1),and heat transfer between the outer surface of the tank andthe surroundings is by natural convection and radiation. Theconvection heat transfer coefficients at the inner and theouter surfaces of the tank are 80 W/m2·K and 10 W/m2·K,respectively. Determine (a) the rate of heat transfer to theiced water in the tank and (b) the amount of ice at 0°C thatmelts during a 24-h period. The heat of fusion of water atatmospheric pressure is hif = 333.7 kJ/kg.arrow_forward
- One of the windows in a house has the shape of a square 1.0 m on a side. The glass in the window is 0.50 cm thick, andhas a coefficient of thermal conductivity of k = 0.84 W>1m # K2. (a) How much heat is lost through this window in oneday if the temperature difference between the inside and outside of the window is 21 C°? (b) Suppose all the dimensionsof the window—height, width, and thickness—are doubled. If everything else remains the same, by what factor doesthe heat flow change?arrow_forwardA steel bridge, considered as a 1D object, is 800 m long at room temperature (25 ̊C). If the coldest temperature at night is 16 ̊C and the hottest temperature during the day is 34 ̊C. What is the maximum change (∆L) of the bridge? The coefficient of linear expansion of the steel is 11.0 × 10-6 ( ̊C)-1. (I asked twice, but I got different answers, one answered 0.0792, the other answered 0.1584. I want to know which one is the correct answer.)arrow_forwardA picture window has dimensions of 1.34 m by 2.65 m and is made of glass 5.93 mm thick. On a winter day, the outside temperature is -20°C, while the inside temperature is a comfortable 19.5°C. At what rate is heat being lost through the window by conduction? kglass = 0.80 W/m.K Round your answer to 2 decimal places.arrow_forward
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