A child has a toy balloon with a volume of 1.80 L. The temperature of the balloon when it was filled was 20.ºC and the pressure was 1.00 atm. If the child were to let go of the balloon and it rose 3 km into the sky where the pressure is 0.667 atm, the balloon’s volume becomes 1.55 L. What is the new temperature, in ºC?

Explanation:

Step one:

given data

V1=1.80L

T1=20°C

P1=1atm

V2=1.55L

T2=?    new temperature

P2=0.667atm

Step two:

The combined gas equation is given as

P1V1/T1=P2V2/T2

make T2 which is the new temperature subject of formula we have

T2=(P2*V2*T1)/P1

T2=1.8*1.55*20/0.667

T2=55.8/0.667

T2=83.65°C

Therefore the new temperature is 83.65°C when the balloon rises 3km

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.

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

hope this ! this is not copied! search it up, it's free of plagiarism!