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a_sh-v [17]
2 years ago
15

PLZ HELP

Physics
1 answer:
Goshia [24]2 years ago
5 0
Space debris that enters earths atmosphere
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PLSS HELP AND I WILL GIVE BRAINLY TO THE ONE WHO ANSWERS CORRECTLY
Ierofanga [76]

The potential difference,electric current ,resistance and new electric current will be 12 V,4 A,3 Ω,2 A.

<h3>What is resistance?</h3>

Resistance is a type of opposition force due to which the flow of current is reduced in the material or wire. Resistance is the enemy of the flow of current.

The energy in terms of the charge and potential difference is;

E= qV

60=5 C × V

V= 12 V

The electric current is found as;

\rm I= \frac{q}{t} \\\\ I= \frac{5}{1.25}\\\\ I=4 \ A

From the ohm's law;

V=IR

12=4 ×R

R=3Ω

If the voltage is constant and the resistance is doubled, then the new electric current is half of the previous condition;

\rm I'=\frac{I}{2} \\\\ I'=\frac{4}{2} \\\\\ I'=2 \ A

Hence, the potential difference,electric current ,resistance and new electric current will be 12 V,4 A,3 Ω,2 A.

To learn more about the resistance, refer to the link;

brainly.com/question/20708652

#SPJ1

7 0
2 years ago
6. The average atomic mass of hydrogen is amu. 7. If a molecule is made of similar kind of atoms, then it is called atomic molec
Roman55 [17]
Answer/
I have no idea i’m so sorry

Explanation/
Have a good day
8 0
3 years ago
starting from rest a skateboarder accelerates at a rate of 2 [m/s 2] for 2 [s]. what is their speed afterwards?
N76 [4]

Answer:

sorry I don't know I am too bad a t this coz I am only at class 7

7 0
2 years ago
A block of wood is tied to the bottom of a large container of water so that the block is completely submerged. The density of th
jeka57 [31]

Answer:

58.9 N

Explanation:

The wood is buoyed up by the mass of the water is displaces

  wood volume = .030 m^3 = 30 000 cm^3

   mass of water displaced = 30 000 g = 30  kg

wood mass =   800 kg/m^3  * .030 m^3 = 24 kg

so tension in string    = mg   = (   30 kg - 24 kg) * 9.81 m/s^2 = 58.9 N

6 0
2 years ago
Consider a 30-cm-diameter hemispherical enclosure. The dome is maintained at 600 K, and heat is supplied from the dome at a rate
SIZIF [17.4K]

Answer:

\epsilon_2=0.098

Explanation:

Diameter d=30cm=0.3m

Temperature T=600k

Rate of supply r=65W

Emissivity of base surface \in_b =0.55

Temperature at base T_b=400k

Generally the equation for Area of base surface is mathematically given by

 A_b=\frac{\pi}{4}d^2

 A_b=\frac{\pi}{4}0.3^2

 A_b=0.0707m^2

Generally the equation for Area of Hemispherical dome is mathematically given by

 A_h=\frac{\pi}{2}d^2

 A_h=\frac{\pi}{2}0.3^2

 A_h=0.1414m^2

Since base is a flat surface

 F_{11}+F_{12}=1

 F_{11}=0

Therefore

 F_{12}=1

 A_b=0.0707m^2

Generally the equation for Net rate of radiation heat transfer between two surfaces is mathematically given by

 Q_{21}=-Q_{12}

 Q_{21}=\frac{\sigma(T_1^4-T_2^4)}{\frac{1-\epsilon}{A_b\epsilon_1} +\frac{1}{A_bF_{12}} +\frac{1-\epsilon_2}{A_h*\epsilon_2} }

Where

 \sigma=5.67*10^{-8}

Therefore

  65=\frac{(5.67*10^{-8}(400^4-600^4))}{\frac{1-0.55}{0.0707*0.55}+\frac{1}{0.0707}+\frac{1-\epsilon_2}{0.1414*\epsilon_2}}

 \epsilon_2=0.098

 \epsilon_2 \approx 0.1

Therefore  the emissivity of the dome is

 \epsilon_2=0.098

3 0
3 years ago
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