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pashok25 [27]
3 years ago
7

NEED HELP ASAP!!!!! IN MIDDLE OF TEST RN HELP PLZ

Physics
2 answers:
svlad2 [7]3 years ago
4 0
ONEEEEEEEEEEEEEEEEEEEEEEEEE
igomit [66]3 years ago
4 0
The answer should be number one
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What will happen when a light bulb is removed from the circuit below, leaving a gap?
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The remaining light bulbs will go out.

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The light bulb that was taken out routed power to the other light bulbs, there for, not giving power to the next light bulbs will make them turn off or, "go out". This may be incorrect, as you did not provide a picture of the circuit.

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3 years ago
Which of the following has the lowest U value?
jarptica [38.1K]

Answer:

c. expanded polyurethane

Explanation:

Thermal performance of a building fabric is measured in terms of heat loss and is expressed as U-value or R-value. U-value is the rate of heat transferred through a structure divided by the difference in temperature across the structure with a unit of measurement of W/m²K.You can calculate the U-value of a by getting the reciprocal of the sum of thermal resistances , R, making the building material.

If you have the value of R, then U=1/R

Material                         size            R                      U

plywood                          1"              1.25                0.8

Poured concrete            2"              0.99               1.010

Expanded polyurethane  1"            6.5                   0.1538

Asbestos shingles            1"             0.03                33.33

The material with lowest U-value is expanded polyurethane

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3 years ago
What physical characteristic is the same for a particular substance regardless of the sample size .
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