EBK PHYSICS FOR SCIENTISTS & ENGINEERS
5th Edition
ISBN: 9780134296074
Author: GIANCOLI
Publisher: VST
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Chapter 38, Problem 11Q
To determine
Whether the temperature reading of the thermometer is the same as the temperature of the hot soup before the measurement was made.
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Thermal emission from
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36.8
An infrared satellite measures outgoing radiation that leaves Earth's surface through an atmospheric window. The observed spectral irradiance at a wavelength of 10 μm is 2.199×107 W m-2 m-1. What is the temperature of the surface? Give your answer in K.
1. A student measures values 9.83 m/s?, 9.79 m/s?, 9.85 m/s?, 9.65 m/s?, 9.86 m/s2 and
9.77 m/s2 for g. Given that the "book" value of g is 9.80m/s?,
(a) Find the average experimental value of g, with its associated uncertainty
(b) Calculate % uncertainty for g
(c) Calculate % error for g.
(d) Which of the previous answers (b or c) determines the accuracy of the measured
value?
(e) Which of the previous answers (c or d) determines the precision of the measured
value?
(f) Is the experimental value compatible with the accepted value?
Chapter 38 Solutions
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- The amount of radiant energy emitted by a surface is given by q = ɛ0 AT+ where q represents the rate of thermal energy (per unit time) emitted by the surface in watts; e = the emissivity of the surface 0<ɛ<1 and is unitless o = Stefan-Boltzman constant (o = 5.67×10% ) A represents the area of the surface in m² Ty = surface temperature of the object expressed in kelvin What are the appropriate units for o if the equation is to be homogeneous in units?arrow_forwardThe emissivity of the human skin is 97.0 percent. Use 35.0 °C for the skin temperature and approximate the human body by a rectangular block with a height of 1.76 m, a width of 43.5 cm and a length of 22.0 cm. Calculate the power emitted by the human body. 2301 J units. No What is the wavelength of the peak in the spectral distribution for this temperature? Fortunately our environment radiates too. The human body absorbs this radiation with an absorbance of 97.0 percent, so we don't lose our internal energy so quickly. How much power do we absorb when we are in a room where the temperature is 23.0 °C? How much energy does our body lose in one second?arrow_forwardHow to find the number of atoms in an iron cylinder given its mass(g)?arrow_forward
- The emissivity of the human skin is 97.0 percent. Use 35.0 °C for the skin temperature and approximate the human body by a rectangular block with a height of 1.66 m, a width of 31.0 cm and a length of 21.5 cm. Calculate the power emitted by the human body. Submit Answer Tries 0/20 What is the wavelength of the peak in the spectral distribution for this temperature? Submit Answer Tries 0/20 Fortunately our environment radiates too. The human body absorbs this radiation with an absorbance of 97.0 percent, so we don't lose our internal energy so quickly. How much power do we absorb when we are in a room where the temperature is 24.0 °C? Submit Answer Tries 0/20 How much energy does our body lose in one second? Submit Answer Tries 0/20arrow_forwardWhat is the maximum wavelength emitted by a blackbody whose temperature is 2900 Karrow_forwardAt what wavelength is the radiation emitted by the human body at its maximum? Assume a temperature of 37°C.arrow_forward
- The emissivity of the human skin is 97.0 percent. Use 35.0 °C for the skin temperature and approximate the human body by a rectangular block with a height of 1.61 m, a width of 37.5 cm and a length of 22.0 cm. Calculate the power emitted by the human body. What is the wavelength of the peak in the spectral distribution for this temperature? Fortunately our environment radiates too. The human body absorbs this radiation with an absorptance of 97.0 percent, so we don't lose our internal energy so quickly. How much power do we absorb when we are in a room where the temperature is 23.5 °C? How much energy does our body lose in one second?arrow_forwardThe radius of our Sun is 6.96 x 108 m, and its total power output is 3.85 x 1026 W. Assuming the Sun's surface emits as a black body, calculate its surface temperature.arrow_forwardA white star that has a surface temperature (in kelvins) that is four times that of our sun the white star radiates only 0.25 times the power radiated by the sun. Our sun has a radius of 6.96 x 10^8m assuming the white star has the same emissivity as the sun find the radius of that white stararrow_forward
- What are the SI units of ?arrow_forwardA marathon runner completes a 42.188-km course in 2 h, 30 min, and 12 s. There is an uncertainty of 25 m in the distance traveled and an uncertainty of 1 s in the elapsed time. (a) Calculate the percent uncertainty in the distance. (b) Calculate the uncertainty in the elapsed time. (c) What is the average speed in meters per second? (d) What is the uncertainty in the average speed?arrow_forwardThe radius of a circle is measured to be (10.5 0.2) m. Calculate (a) the area and (b) the circumference of the circle, and give the uncertainty in each value.arrow_forward
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