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exis [7]
3 years ago
6

A box sits on a table. A long arrow labeled F subscript P = 22 N points right. A short arrow labeled F subscript f = ? N points

left. A man pushes on the box from the left. The net force acting on the box is 18 N. What is the force of friction?
–22 N
–4 N
4 N
22 N

Physics
2 answers:
anygoal [31]3 years ago
8 0

Answer:

b -4 N

may the force be with you

dexar [7]3 years ago
7 0

Answer:

b-4 N

Explanation:

I think thats right

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Bingel [31]

<em>why Is there just a random "u" in the middle of the equation </em><em>awa</em><em> </em>

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<em>Imao the u in the middle doesn't makes sense </em>

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6 0
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Read 2 more answers
Compare the foot of mollusks with the tube feet of echinoderms.
stira [4]

Mollusks live in fresh water, in marine environment, but also on land.

<span>Echinoderms live only in water. This is the reason why they have developed different systems for moving. Mollusks have only singular muskullus foot for walking and Echinoderms have tube feet which they use for moving, as well for collecting and transporting food to their mouth. </span>



4 0
3 years ago
A train travels 90 kilometers in 4 hours, and then 82 kilometers in 1 hours. What is its average speed?
kvasek [131]
Average speed = total distance / total time.

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5 0
2 years ago
A truck was moving with a velocity of 25 meters per second east. What other information is needed to calculate the momentum of t
ladessa [460]
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8 0
2 years ago
The emissivity of galvanized steel sheet, a common roofing material, is 0.13 at temperatures around 300 K, while its absorptivit
vfiekz [6]

Answer:

Total heat transfer rate is combined convection and radiation transfer rate, multiplied with absorptivity factor. From that equation you can find temperature of the roof using iteration method.  

Explanation:

<u>Known:</u>

steel sheet roof emissivity ∈ = 0.13

steel sheet roof absorptivity \alpha_s = 0.65

air temperature T∞ = 16°C ...= 289K

heat transfer rate G_s = 750 W/m2

natural convection h = 7W/m2K

Total heat transfer rate is combined heat transfer rate of convection and radiation, multiplied with absorptivity factor:  

\alphaG_s=q_{conv} +q_{rad} =hA(T∞-T_m)+∈σA(T_{surf} -T_{s} )

\alphaG_s-h(T_s-T∞)-∈σ(T_{s} -T_{surf} )=0

2562-7T_s-7.371*10^-9=0

Use iteration method to solve for T_s

T_s=350.17 K...=77.17°C

In this particular situation, cat would not be comfortable with walking on a roof since its surface temperature is 77.17°C which may even cause burns to its paws.  

4 0
2 years ago
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