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yKpoI14uk [10]
3 years ago
12

Shiny reflective clothing allows a firefighter to get closer to a fire. What type of heat transfer is reduced because of this ma

terial?
A.Conduction
B.Insulation
C.Radiation
D.Convection
Physics
1 answer:
joja [24]3 years ago
6 0
A.) conduction.

conduction is the process by which heat or electricity is directly transmitted through a substance when there is a difference of temperature or of electrical potential between adjoining regions, without movement of the material.

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What is the potential energy of a 2kg plant that is on a windowsill 1.3m high?
Marysya12 [62]

Answer:

P.E = 25.48 Joule

Explanation:

Here,

mass (m) = 2kg

height (h) = 1.3m

g = 9.8m/s^2

P.E = mgh

= (2) (9.8) (1.3)

P.E = 25.48 Joule

Thus, the potential energy of a 2kg plant that is on a windowsill 1.3m high is 25.48 Joule

-TheUnknownScientist

4 0
3 years ago
Some pipe organs create sounds lower than humans can hear. This ""infrasound"" can still create physical sensations. What is the
Dominik [7]

Answer: 17.59 Hz and 4.87 m

Explanation:

The fundamental frequency of the sound from an open-open pipe is given as

f= \frac{v}{2L}

where v= 343 m/s

L= 32 feet= \frac{32}{3.281} = 9.75 m

So,

f= \frac{343}{2*9.75} = 17.59 Hz

The length of open-closed tube is related to frequency by formula

f= \frac{v}{4L}

or L=\frac{v}{4f}

L= \frac{343}{4*17.59}

L= 4.87 m

8 0
4 years ago
How is the blance between oxygen and carbon dioxide maintained the atmosphere ?​
GarryVolchara [31]
The balance of oxygen and carbondioxide is maintained in the atmosphere by the oxygen released by plants during photosynthesis and carbondioxide released by human,animals etc. The balance of oxygen and carbondioxide is made due to respreration and photosinthesis.
7 0
3 years ago
Un auto se mueve con velocidad constante de 20 m/s y la mantiene durante 20 s. Después se le aplica una aceleración constante y
pentagon [3]

Answer:

26.67 s

Explanation:

v = Velocidad final = 40 m/s

u = Velocidad inicial = 20 m/s

t_1 = Tiempo inicial = 20 s

t_2 = Tiempo empleado durante la aceleración

a = Aceleración

s = Desplazamiento del automóvil durante la aceleración = 200 m

De las ecuaciones lineales de movimiento tenemos

v^2-u^2=2as\\\Rightarrow a=\dfrac{v^2-u^2}{2s}\\\Rightarrow a=\dfrac{40^2-20^2}{2\times 200}\\\Rightarrow a=3\ \text{m/s}^2

v=u+at_2\\\Rightarrow t_2=\dfrac{v-u}{a}\\\Rightarrow t_2=\dfrac{40-20}{3}\\\Rightarrow t_2=6.67\ \text{s}

El tiempo necesario para acelerar es 6.67 s

El tiempo total necesario para toda la ruta es t=t_1+t_2=20+6.67=26.67\ \text{s}.

4 0
3 years ago
_________ forces exist between objects that are not in contact with each other
valina [46]

Answer:

Gravity as well as electrostatic and magnetic attraction and repulsion provide real life examples of forces being exerted by one object on another without them being in contact with each other. Many children are aware of magnetism and have played with fridge magnets.

8 0
3 years ago
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