Concept explainers
(a)
Find the amount of radiation emitted from a hot pavement in Arizona.
(a)
Answer to Problem 35P
In SI units, The amount of radiation emitted from a hot pavement in Arizona is
Explanation of Solution
Given data:
Area of the surface,
Emissivity of the surface,
Temperature of the surface,
Formula used:
The relationship between degree Celsius
Here,
The formula for the amount of radiant energy emitted by a surface is,
Here,
Calculation:
Substitute
Substitute
Do the unit conversion in above result,
Therefore, in SI units, The amount of radiation emitted from a hot pavement in Arizona is
Conclusion:
Hence, in SI units, The amount of radiation emitted from a hot pavement in Arizona is
(b)
Find the amount of radiated emitted from a hood of a car.
(b)
Answer to Problem 35P
In SI units, The amount of radiation emitted from a hood of a car is
Explanation of Solution
Given data:
Area of the surface,
Emissivity of the surface,
Temperature of the surface,
Calculation:
Substitute
Substitute
Do the unit conversion in above result,
Therefore, in SI units, the amount of radiation emitted from a hood of a car is
Conclusion:
Hence, in SI units, the amount of radiation emitted from a hood of a car is
(c)
Find the amount of radiated emitted from a sunbather.
(c)
Answer to Problem 35P
In SI units, The amount of radiation emitted from a sunbather is
Explanation of Solution
Given data:
Area of the surface,
Emissivity of the surface,
Temperature of the surface,
Calculation:
Substitute
Substitute
Do the unit conversion in above result,
Therefore, in SI units, the amount of radiation emitted from a sunbather is
Conclusion:
Hence, in SI units, the amount of radiation emitted from a sunbather is
Want to see more full solutions like this?
Chapter 11 Solutions
ENGINEERING FUNDAMENTALS
- Assume 40% of the light emitted by a 1000 W metal halide lamp (110,000 lm) illuminates a surface with the area of a 32-ft diameter. 1. Determine the average illuminance of the surface in foot candles. 2. Determine the average illuminance of the surface in lux.arrow_forward10 pts Question 4 What is the electric held strength in units of N/C if the flux through a 2.0m by 1.0m rectangular surface is 817 Nm2/C, if the electric field is uniform, and if the plane of the surface is at an angle of T/3 radians with respect to the direction of the field? No decimal is required and maximum of 5% of error is accepted in your answer.arrow_forwardAssuming specific weight of air to be constant, what is the approximate height of Mount Banahaw in m if a mercury barometer at the base of the mountain reads 654 mm and at the same instant, another barometer at the top of the mountain reads 480 mm? Show Unit Analysis Solutionarrow_forward
- According to Newton's law of cooling, the rate at which a substance cools in alir is directly proportional to the difference between the temperatures of the substance and that of air. If the temperature of the air is 30° and the substance cools from 100* to 70* in 15 minutes, how long will it take to cool 100* to 50? a. 33. 59 min C. 41.74 min d. 45.90 min b. 43.80 minarrow_forwardEngineering Utilities (Principles of Lighting Design) 1. Light from a chromatic light source strikes a surface. Seventy percent of the light is reflected and 30% is absorbed. a. What percentage of the light incident on the surface is transmitted? b. What are the reflectance, absorptance, and transmittance values? c. In your opinion, is the surface receiving the light or dark in color? d. Is the surface translucent or opaque?arrow_forwardA vendor takes an ice cream cup out of a freezer, kept at -18 degree-Celcius. Outside, the room temperature is 32 degree-Celcius. After 60seconds, the ice cream has warmed to -8 degrees Celcius. What is the temperature of the ice cream after 300 seconds?arrow_forward
- What is the equivalent value of T = 50° C in degrees Fahrenheit, degrees Rankine, and kelvins?arrow_forwardCalculate the capillary effect in millimeters in a glass tube of 4 mm diameter, when immersed in water and mercury respectively. The temperature of the liquid is 20°C and the values of the surface tension of water and mercury in contact with air are 0.073575 N/m and 0.51 N/m respectively. The angle of contact for water is zero and that for mercury is 130⁰. Take density of water at 20°C as equal to 998 kg/m³.arrow_forward
- Engineering Fundamentals: An Introduction to Engi...Civil EngineeringISBN:9781305084766Author:Saeed MoaveniPublisher:Cengage Learning