You can see your image in a mirror because of diffuse reflection
a. True
b. False
Indicate whether the statement is true or false
False
You might also like to view...
A herd of sheep eats 10 bales of hay every 4 days. If a bale of hay costs $2.85, how much will it cost to feed the sheep hay for one year?
a. $912.50 b. $2,600.63 c. $28.50 d. $3,650.00
A box sliding on a frictionless flat surface runs into a fixed spring, which compresses a distance x to stop the box. If the initial speed of the box were doubled, how much would the spring compress in this case?
a) half as much b) the same amount c) ? 2 times as much d) twice as much e) four times as much
A cooling system is to be designed for a food storage warehouse for keeping perishable foods cool prior to transportation to grocery stores. The warehouse has an effective surface area of 1860 m2 exposed to an ambient air temperature of 320C. The warehouse wall insulation (k = 0.17 W/(m K)) is 7.5 cm thick. Determine the rate at which heat must be removed (W) from the warehouse to maintain the food at 4°C.
GIVEN
• Cooled warehouse
• Effective area (A) = 1860 m2
• Temperatures
? Outside air = 32°C
? food inside = 4°C
• Thickness of wall insulation (L) = 7.5 cm = 0.075 m
• Thermal conductivity of insulation (k) = 0.17 W/(m K)
FIND
• Rate at which heat must be removed (q)
ASSUMPTIONS
• One dimensional, steady state heat flow
• The food and the air inside the warehouse are at the same temperature
• The thermal resistance of the wall is approximately equal to the thermal resistance of the wall insulation alone
SKETCH
The 120°W longitude meridian is the center of the ______________ Standard Time zone in the United States
a. Pacific b. Mountain c. Eastern d. Central