Answer:
B. Earth's internal heat is thermal energy generated from molten rock under great pressure.
Absolute Zero, hopefully that helps :)
Answer:
The magnetic force on the moving negative charge is towards the ceiling.
Explanation:
The magnetic force acting on a wire is given by the relation as follows :

q is charged particle
v is velocity of charged particle
B is magnetic field
In this case, a negative charge is moving across a rook from south to north. A magnetic field runs from East to west.
q = -q
v =+j
B = -i
So,

Since, 
So,

So, the magnetic force on the moving negative charge is towards the ceiling.
As per given condition we know that vertex angle of the cone is given as

so here we can say that vertex angle will remain constant
so here



now for the volume we can say

also we can say

so here we will have

now for volume flow rate


now plug in all data


Answer:
vf = v₁/3 + 2v₂/3
Explanation:
Using the law of conservation of linear momentum,
momentum before impact = momentum after impact
So, Mv₁ + 2Mv₂ = 3Mv (since the railroad cars combine) where v₁ = initial velocity of first railroad car, v₂ = initial velocity of the other two coupled railroad cars, and vf = final velocity of the three railroad cars after impact.
Mv₁ + 2Mv₂ = 3Mvf
dividing through by 3M, we have
v₁/3 + 2v₂/3 = vf
vf = v₁/3 + 2v₂/3