Answer:
2.36 x 10^5 kg
Explanation:
radius of hose, r = 0.017 m
radius of underground pipe, R = 0.088 m
number of hoses, n = 3
velocity of water in underground pipe, V = 2.7 m/s
Let v is the velocity of water in each hose.
According to the equation of continuity
A x V = n x a x v
π R² x V = n x π x r² x v
0.088 x 0.088 x 2.7 = 3 x 0.017 x 0.017 x v
v = 24.12 m/s
(a) Amount of water poured onto a fire in one hour by all the three hoses
= n x a x v x density of water x time
= 3 x 3.14 x 0.017 x 0.017 x 24.12 x 1000 x 3600
= 2.36 x 10^5 kg
Thus, the amount of water poured onto the fire in one hour is 2.36 x 10^5 kg.
Answer:
A negative potential energy becomes more negative
Explanation:
Let the charges be - Q₁ and Q₂ . Let the distance between them be d .
Potential energy = k -Q₁x Q₂ / R
= - KQ₁ Q₂ / R
Now if the magnitude of R decreases , the magnitude of potential energy increases . So we see that the negative potential energy becomes more negative .
Magnetic flux density - It is the force acting per unit current per unit length on a wire placed to magnetic field at right angle.
It is denoted by B
unit of B is tesla (T)
The total no. of magnetic field lines passing through a area is called magnetic flux.
Magnitude of the magnetic flux - It is equal to the area of the surface and having perpendicular direction to the plane of the surface.
Its unit is weber (Wb)
Direction to the magnetic flux density - The direction is north pole to the south pole.
The magnetic field lines are known as lines of magnetic flux.
flux lines are not in direction of force but perpendicular.
To know more about magnetic flux density:
brainly.com/question/14236561
#SPJ4
Answer:
3. 
Explanation:
Energy of volume contained in a dam is given by
where,
A = Horizontal surface area of the barrage
= Density of water
g = Acceleration due to gravity = 9.81 m/s²
h = Vertical tidal range,
It can be seen that
Hence, the energy is proportional to
The direction of the curl of magnetic field is determined by right hand thumb rule. Suppose you are holding a current carrying wire in your right hand such that the direction in which your thumb points is the direction of the current in the that wire then the fingers curled will determine the direction of the magnetic field. In B, the direction of current in the wire is towards ourself. Now, use right hand rule such that the thumb points towards yourself. The curled fingers rotate clockwise. Therefore, the magnetic field is in anti-clock direction
