Find the weight of the air at 20- C contained in a room with 4-0 m - 5-0 m floor and a ceiling 3-0 m high- Density of air at 20- C is 1-20 kg - m 3 -A- 72 kgB- 30 kgC- 95 kgD- 15 kg

The correct option is A 72 kg We assume the density of air is uniform. Execution: V = 4 × 5 × 3 = 60 m^3 M_air = ρ× v = 1.2 × 60 = 72 kg W_air = Mg = 72 × 10 ...

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Standard XII

Physics

Density

Find the weig...

Question

Find the weight of the air at 20⁰C contained in a room with $4.0 m \times 5.0 m$ floor and a ceiling 3.0 m high. (Density of air at 20⁰C is 1.20 kg/m³).

72 kg

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30 kg

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95 kg

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15 kg

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Solution

The correct option is A
72 kg

We assume the density of air is uniform.

$E x e c u t i o n : V = 4 \times 5 \times 3 = 60 m^{3}$

$M_{a i r} = ρ \times v = 1.2 \times 60 = 72 k g$

$W_{a i r} = M g = 72 \times 10 = 720 N$

Notice that an average roomful of air weights as much as an adult human.

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Find the weight of the air at 200C contained in a room with 4.0m×5.0m floor and a ceiling 3.0 m high. (Density of air at 200C is 1.20 kg/m3).

The correct option is A 72 kg We assume the density of air is uniform. Execution:V=4×5×3=60m3 Mair=ρ×v=1.2×60=72kg Wair=Mg=72×10=720N Notice that an average roomful of air weights as much as an adult human.

Find the weight of the air at 20⁰C contained in a room with $4.0 m \times 5.0 m$ floor and a ceiling 3.0 m high. (Density of air at 20⁰C is 1.20 kg/m³).

The correct option is A
72 kg

We assume the density of air is uniform.

$E x e c u t i o n : V = 4 \times 5 \times 3 = 60 m^{3}$

$M_{a i r} = ρ \times v = 1.2 \times 60 = 72 k g$

$W_{a i r} = M g = 72 \times 10 = 720 N$

Notice that an average roomful of air weights as much as an adult human.