what is blisttered copper​

Answer:

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Step-by-step explanation:

Total cost = 498.96 Rs. => Area whitewashed = 249.48 Rs. And according to the question, the area whitewashed is Curved surface area of hemisphere. => 523.908 m³ (approx.)

[tex] \star \; {\underline{\boxed{\pmb{\red{\frak{ \; Given \; :- }}}}}} [/tex]

• Cost of white - washing = Rs.4989.60
• Rate of white - washing = Rs.20

[tex] \\ \\ [/tex]

[tex] \star \; {\underline{\boxed{\pmb{\blue{\frak{ \; To \; Find \; :- }}}}}} [/tex]

• Inside surface area of the dome = ?
• Volume of the air inside the dome = ?

[tex] \\ \\ [/tex]

[tex] \star \; {\underline{\boxed{\pmb{\orange{\frak{ \; SolutioN \; :- }}}}}} [/tex]

[tex] \maltese [/tex] Formula Used :

• [tex] {\underline{\boxed{\pmb{\sf{ CSA{\small_{(Hemisphere)}} = 2 \pi {r}^{2} }}}}} [/tex]

• [tex] {\underline{\boxed{\pmb{\sf{ Volume{\small_{(Hemisphere)}} = \dfrac{2}{3} \pi {r}^{3} }}}}} [/tex]

[tex] \\ \qquad{\rule{150pt}{2pt}} [/tex]

[tex] \maltese [/tex] How to Calculate :

[tex] \longrightarrow [/tex] Here, we can Calculate the Surface Area by dividing the Cost with the Rate . And for calculating the Air sinsid the dome we need to calculate the Volume . As we know for calculating it we should get the Radius first .So, Let's Solve :

[tex] \\ \qquad{\rule{150pt}{2pt}} [/tex]

[tex] \maltese [/tex] Calculating the Surface Area :

[tex] {\longmapsto{\qquad{\sf{ Surface \; Area = \dfrac{ Cost }{Rate} }}}} \\ \\ \\ \ {\longmapsto{\qquad{\sf{ Surface \; Area = \dfrac{ 4989.60 }{20} }}}} \\ \\ \\ \ {\longmapsto{\qquad{\sf{ Surface \; Area = \dfrac{ 498960 }{20 \times 100} }}}} \\ \\ \\ \ {\longmapsto{\qquad{\sf{ Surface \; Area = \cancel\dfrac{ 498960 }{2000} }}}} \\ \\ \\ \ {\qquad \; \; {\therefore \; {\underline{\boxed{\pmb{\pink{\sf{ Surface \; Area = 249.48 \; {m}^{2} }}}}}}}} [/tex]

[tex] \\ \qquad{\rule{150pt}{2pt}} [/tex]

[tex] \maltese [/tex] Calculating the Radius :

[tex] {\dashrightarrow{\qquad{\sf{ CSA = 2 \pi {r}^{2} }}}} \\ \\ \\ \ {\dashrightarrow{\qquad{\sf{ 249.48 = 2 \times \dfrac{22}{7} \times {r}^{2} }}}} \\ \\ \\ \ {\dashrightarrow{\qquad{\sf{ 249.48 \times 7 = 2 \times 22 \times {r}^{2} }}}} \\ \\ \\ \ {\dashrightarrow{\qquad{\sf{ 1746.36 = 44 \times {r}^{2} }}}} \\ \\ \\ \ {\dashrightarrow{\qquad{\sf{ \dfrac{1746.36}{44} = {r}^{2} }}}} \\ \\ \\ \ {\dashrightarrow{\qquad{\sf{ \cancel\dfrac{1746.36}{44} = {r}^{2} }}}} \\ \\ \\ \ {\dashrightarrow{\qquad{\sf{ 39.69 = {r}^{2} }}}} \\ \\ \\ \ {\dashrightarrow{\qquad{\sf{ \sqrt{39.69} = r }}}} \\ \\ \\ \ {\qquad \; \; {\therefore \; {\underline{\boxed{\pmb{\purple{\sf{ Radius = 6.3 \; cm }}}}}}}} [/tex]

[tex] \\ [/tex]

[tex] \\ \qquad{\rule{150pt}{2pt}} [/tex]

[tex] \maltese [/tex] Calculating the Volume of air :

[tex] {\implies{\qquad{\sf{ Volume = \dfrac{2}{3} \pi {r}^{3} }}}} \\ \\ \\ \ {\implies{\qquad{\sf{ Volume = \dfrac{2}{3} \times \dfrac{22}{7} \times {6.3}^{3} }}}} \\ \\ \\ \ {\implies{\qquad{\sf{ Volume = \dfrac{2}{3} \times \dfrac{22}{7} \times \bigg( {\dfrac{63}{10}} \bigg)^{3} }}}} \\ \\ \\ \ {\implies{\qquad{\sf{ Volume = \dfrac{2}{3} \times \dfrac{22}{\cancel7} \times \dfrac{\cancel{63}}{10} \times \dfrac{63}{10} \times \dfrac{63}{10} }}}} \\ \\ \\ \ {\implies{\qquad{\sf{ Volume = \dfrac{2}{3} \times 22 \times \dfrac{9}{10} \times \dfrac{63}{10} \times \dfrac{63}{10} }}}} \\ \\ \\ \ {\implies{\qquad{\sf{ Volume = \dfrac{1571724}{3000} }}}} \\ \\ \\ \ {\implies{\qquad{\sf{ Volume = \cancel\dfrac{1571724}{3000} }}}} \\ \\ \\ \ {\qquad \; \; {\therefore \; {\underline{\boxed{\pmb{\red{\sf{ Volume = 523.9 \; {m}^{3} \; \bigg\lgroup Approx. \bigg\rgroup }}}}}}}} [/tex]

[tex] \\ \qquad{\rule{150pt}{2pt}} [/tex]

[tex] \maltese [/tex] Therefore :

❛❛ Surface Area of the Dome is 249.48 cm² and the Volume of air inside the dome is 523.9 cm³ . ❜❜

[tex] \\ {\underline{\rule{300pt}{9pt}}} [/tex]

Answer:

A refrigerator is a popular domestic machine that has a thermally insulated compartment and a heat pump that transfers heat from inside the refrigerator to the external environment so that the temperature inside the refrigerator is lower than the ambient temperature of the room.

Nowadays refrigerator is used to preserve food in almost all countries, it reduces the reproduction rate of bacteria because they cannot breed in low temperature.

Keeps the refrigerator temperature slightly above the freezing point, the temperature is kept at 3-5 degrees (37 to 41 degrees F) to keep food safe.

Any machine whose temperature is below freezing point is called Freezer.

Answer:

A refrigerator is a popular domestic machine that has a thermally insulated compartment and a heat pump that transfers heat from inside the refrigerator to the external environment so that the temperature inside the refrigerator is lower than the ambient temperature of the room.

Nowadays refrigerator is used to preserve food in almost all countries, it reduces the reproduction rate of bacteria because they cannot breed in low temperature.

Keeps the refrigerator temperature slightly above the freezing point, the temperature is kept at 3-5 degrees (37 to 41 degrees F) to keep food safe.

Any machine whose temperature is below freezing point is called Freezer.

Even before the fridge, a machine was used to keep cool, which was called icebox, but the refrigerator replaced it.

The fundamental reason for having a refrigerator is to keep food cold. Cold temperatures help food stay fresh longer. The basic idea behind refrigeration is to slow down the activity of bacte- ria (which all food contains) so that it takes longer for the bacteria to spoil the food.

ADVANTAGES OF REFRIGERATOR:

We can store food in the fridge for a long time and keep it free from germs.

Some food items are get deteriorate quickly due to the outside environment, we can also keep them in the fridge and use them after a few days.

Even if the food is not wicked outside, there is a risk of insects getting bogged down, but the food is also saved from insects inside the fridge.

We keep drinking water, cold drinks, there is no use of drinking without cooling and in that sense, it is also very beneficial for us.

DISADVANTAGES OF REFRIGERATOR:

We have to keep the fridge continuously with 24 * 7 electricity and it costs a lot of electricity.

Although we use the fridge every day but pay very little attention to it, most of all we remember it in the summer season because we need cold water and a cold drink.

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Answer:

The answer is (2).

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Answer:

The average power is defined as ratio of Total work done (or Total energy consumed) and the total time taken. Average Power = Total Work Done / Total Time.

Explanation:

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