Question

Tyre of a bicycle has volume 2000 cm3 . Initially, the tube is filled to 0.75 of its volume by air at atmospheric pressure of P0 = 105 Nm–2. Area of contact of tyre with road is A = 24 cm2 when total mass of bicycle and its rider is m = 120 kg. Calculate the number of strokes of pump, which delivers v = 500 cm3 volume of air in each **, required to inflate the type.

Asume that area of contact of tyre with road *** unchanged. (g = 10 ms–2)

Answer 1

Atmospheric pressure, P0 = 105 Nm–2 Increase in pressure (due to weight of bicycle and its rider)

Let temperature be T.

Finally, number of ***** of air in the tube

Volume of these ***** at atmospheric pressure,

Initially, volume of air in tube (at atmospheric pressure) is V0 = 0.75 × 2000 cm3.

= 1.5 × 10–3 m3.

Volume (at atmospheric pressure) of air to be pumped in is

Volume (at atmospheric pressure) of air pumped in each ** is