Natural selection is random
a. True
b. False
Indicate whether the statement is true or false
False
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In a curing process for plastic and other polymer-based materials, a plastic sheet, which initially is 25°C, is placed on a hot metal surface that is maintained at 250°C. If the back (or opposite) side of the 5-mm-thick plastic film is considered to be insulated, how long does it take for the back side to reach temperature of 90°C. Assume the following plastic properties: c = 1450 J/(kg K), k= 0.23 W/(m K), and ?= 1975 kg/m3
GIVEN
• Initial temperature of plastic sheet (T0)= 250C
• Sheet thickness (2L) = 5 mm = 0.005 m
• Opposite side or back is insulated
• Metal surface temperature (T?)= 2500C
• The thermal conductivity of the plastic (k) = 0.23 W/(m K)
• Density(?) = 1975 kg/m3
• Specific heat capacity (c)= 1450 J/(kg K)
FIND
Time taken for backside to reach temperature of 900C
ASSUMPTIONS
• The initial temperature of the sheet is uniform
• The temperature of the steel plates is constant
• The thermal conductivity of the sheet is constant
SKETCH
Which event occurred at a redshift around 1100?
a. big bang b. inflation c. CMB d. first stars formed
Refer to the graph. The acceleration of the object is equal to zero
A. in region A. B. in region B. C. in region C. D. in regions A and C. E. The acceleration is never equal to zero
How many grams of ice at -13°C must be added to 711 grams of water that is initially at a temperature of 87°C to produce water at a final temperature of 10.0°C?
Assume that no heat is lost to the surroundings and that the container has negligible mass. The specific heat of liquid water is 4190 J/kg•C° and of ice is 2050 J/kg•C°. For water the normal melting point is 0.00°C and the heat of fusion is 334 × 103 J/kg. The normal boiling point is 100°C and the heat of vaporization is 2.26 × 106 J/kg.