WPH0 QR Dynamic Papers Physics al Edexcel

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Edexcel | Physics WPH0 | S 10 5 1 | 1 hour 30 minutes

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When your diaphragm contracts, the pressure in the chest cavity is lowered below

atmospheric pressure and air is forced into your lungs.

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(a)

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2 Mark s

The diaphragm contracts and the lung capacity increases by 20%. State two

assumptions you would need to make to calculate the new pressure in the lungs if the initial pressure is known.

Any two from:

Air behaves as an ideal gas (1)

Temperature (in the lungs) stays constant (1)

Implication of no change in mass of gas

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(b) (I)

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2 Mark s

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(b) (II)

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2 Mark s

If body temperature is 37.6°C and the temperature outside the body is 20.0°C,

calculate the rate at which energy is used to warm air up to body temperature.

Rate = .....................................................................

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