Question 1: Bicycle pump In this problem, you will look at the pressure developed by the piston in a

bicycle pump

Air at atmospheric pressure (1.0 x 105 Pa) is compressed at constant

temperature in a bicycle pump so that its volume is reduced by a factor of

5.

What is the pressure of the air when compressed?

The pressure  of the air when compressed is

Explanation:

Boyle's Law: This law states that pressure is inversely proportional to the volume of the gas at constant temperature and number of moles.

    (At constant temperature and number of moles)

where,

= initial pressure of gas  =

= final pressure of gas  =?

= initial volume of gas  = V

= final volume of gas  =

Therefore, the pressure  of the air when compressed is

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.