Answer:
A. 
B. 
C. 
D.
Explanation:
Given:
- no. of moles of oxygen in the cylinder,

- initial pressure in the cylinder,

- initial temperature of the gas in the cylinder,

<em>According to the question the final volume becomes twice of the initial volume.</em>
<u>Using ideal gas law:</u>



A.
<u>Work done by the gas during the initial isobaric expansion:</u>




C.
<u>we have the specific heat capacity of oxygen at constant pressure as:</u>

Now we apply Charles Law:



<u>Now change in internal energy:</u>



B.
<u>Now heat added to the system:</u>



D.
Since during final cooling the process is isochoric (i.e. the volume does not changes). So,
Answer:
a

b

Explanation:
From the question we are told that
The number of identical drippers is n = 60
The diameter of each hole in each dripper is
The diameter of the main pipe is 
The speed at which the water is flowing is 
Generally the amount of water used in one hour = 3600 seconds is mathematically represented as

Here A is the area of the main pipe with value

=> 
=> 
So
=> 
=> 
Generally the area of the drippers is mathematically represented as

=> 
=> 
Generally from continuity equation we have that

=> 
=> 
Explanation:
Distance travelled (d) = 56 metres
Time taken (t) = 7 seconds
velocity of the object (V)
= d / t
= 56 / 7
= 8 m/s
The velocity of the object is 8 m/s.
Hope it will help :)
When a sound source is moving toward you, you hear a higher frequency than the source is putting out, and when the source is moving away from you, you hear a lower frequency than the real one. The whole process is called the Doppler effect. It works with light too.
Answer:
F_net = B -W
The forces of action and reaction are the weight of the balloon that is the force of attraction of the Earth and the outside so the balloon pulls the earth that has an upward direction and is applied to the planet
Explanation:
A hot air balloon is subjected to the force of its weight directed towards the center of the Earth. The thrust due to the cold air released, this thrust is directed upwards.
If we assume that the balloon rises at a constant speed
F_net = B -W
F_neta = ρ g V_body - ρ_body g V_body
The forces of action and reaction are the weight of the balloon that is the force of attraction of the Earth and the outside so the balloon pulls the earth that has an upward direction and is applied to the planet