A metal ball of surface area 200 cm2 and temperature 527-C is surrounded by a vessel at 27-C- If the emissivity of the metal is 0-4- then the rate of loss of heat from the ball is - - - 5-67- 10-8J-m-2-s-k4 -

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Standard X

Mathematics

Surface Area of a Sphere

A metal ball ...

Question

A metal ball of surface area $200 c m^{2}$ and temperature $527^{\circ} C$ is surrounded by a vessel at $27^{\circ} C$ . If the emissivity of the metal is $0.4$ , then the rate of loss of heat from the ball is $[σ = 5.67 \times 10^{- 8} J / m^{- 2} - s - k^{4}]$

1.100 J / s

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157.97 J / s

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146.9 J / s

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182.1 J / s

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Solution

The correct option is D $182.1 J / s$

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A metal ball of surface area $200 c m^{2}$ and temperature $527^{o} C$ is surrounded by a vessel at $27^{o} C$ . If the emissivity of the metal is 0.4, then the rate of loss of heat from the ball is $(ρ = 5.67 \times 10^{- 5} J / m^{2} - s - k^{4})$

Q. A metal ball of surface area

200

c m^{2}

and temperature

527^{\circ} C

is surrounded by a vessel at

27^{\circ} C

. If the emissivity of the metal is 0.4, then the rate of loss of heat from the ball is approximately:

σ = 5.67 \times 10^{- 8} \frac{j o u l e}{m^{2} \times s e c \times K^{2}}

A metal ball of surface area $200 c m^{2}$ and temperature $527^{0} C$ is surrounded by a vessel at $27^{0} C .$ If the emissivity of the metal is 0.4, then the rate of loss of heat from the ball is $σ = 5.67 \times 10^{- 8} J / m^{2} - s - k^{4}$

Q. Compare rates of loss heat by the body at temperatures

527^{\circ} C

and

127^{\circ} C

. Temperature of surrounding is

27^{\circ} C

A metallic sphere having radius 0.08m and mass m = 10 kg is heated to a temperature of $227^{\circ} C$ and suspended inside a box whose walls are at a temperature of $27^{\circ} C$ . The maximum rate at which its temperature will fall is Take $e = 1, σ = 5.8 \times 10^{- 8} W m^{- 2} K^{- 4}$ and specific heat of the metal $S = 90 c a l / k g / k; J = 4.2 J / c a l)$

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A metal ball of surface area 200 cm2 and temperature 527∘C is surrounded by a vessel at 27∘C. If the emissivity of the metal is 0.4, then the rate of loss of heat from the ball is [σ=5.67×10−8J/m−2−s−k4]

The correct option is D 182.1 J/s

A metal ball of surface area $200 c m^{2}$ and temperature $527^{\circ} C$ is surrounded by a vessel at $27^{\circ} C$ . If the emissivity of the metal is $0.4$ , then the rate of loss of heat from the ball is $[σ = 5.67 \times 10^{- 8} J / m^{- 2} - s - k^{4}]$

The correct option is D $182.1 J / s$