Answer:
By induction method
Explanation:
Induction method involves charging an electrically neutral body by bringing it in contact with an electrically charged body.
For the electrophus, a charge opposite that on the slab is induced on the side in contact with the slab; driving the opposite charge (this will be the same as that on the slab) to the other end of the elctrophus. Touching the electrophus removes the charge opposite the charge induced on the electrophus by the charged slab either by drawing up charge from the earth or taking the charge to earth (depends on the charge. A negative charge is drawn to earth while a positive charge draws up electrons from the earth)
I believe the answer is the second option.
Answer:
v=18.54167 m/s
Explanation:
the law of linear momentum conservation says that when the resultant force in an object is null, the linear momentum is constant over time, so in accordance the paragrapfh the railroad car is moving and the forces acting on it is the weight and the normal force, so we can say that the resultant force on the railroad car are equal to zero
So, the linear momentum can be written
V_{1}= 15m/s
m1= 89000 kg
To the m2 we subtract the weight of sand that leak out
m2= 89000 kg - 17000 kg =72 000 kg
V_{2}=
V_{2}= 18.54167 m/s