To solve the problem it is necessary to apply the definition of Newton's second Law and the definition of density.
Density means the relationship between volume and mass:
While Newton's second law expresses that force is given by
F = ma
Where,
m = mass
a= acceleration (gravity at this case)
In the case of the given data we have to,
In equilibrium, the entire system is equal to zero, therefore
Where,
Weight of balloon
Weight of helium gas
Bouyant force
Then we have,
Replacing the values we have that
Now by ideal gas law we have that
But the relation \frac{n}{m} is equal to the inverse of molar mass, that is
Therefore the pressure of the helium gas assuming it is ideal is 0.61Mpa
I think it is 100 dB .I holp it is help.
Answer: the loop will move up
Explanation:
Whenever an electric current cuts across magnetic field lines, a force is exerted on the current - carrying conductor
According to Fleming's left hand rule, the thumb is the direction of motion.
First finger is the direction of magnetic field, while the second finger is the direction of the conventional current.
When a current flow in the will, the wire will experience an upward force. And continue to rotate in an up - down direction. Therefore, the loop will move up.
We can solve the problem by using the law of conservation of energy:
- at the beginning, all mechanical energy of the object is just kinetic energy: 
, where m is the mass and v is the velocity
- at the point of maximum height, all mechanical energy of the object is just gravitational potential energy: 
, where h is the maximum height
Therefore, the conservation of energy becomes:
Re-arranging, we find the maximum height:
