Answer:
Atoms cannot be divided using chemicals. They do consist of parts, which include protons, neutrons,...
Each electron has a negative electrical charge.
Each proton has a positive electrical charge.
Each neutron is electrically neutral. In other words, neutrons do not have a charge
Explanation:
It is possible, but very slim. The fish will move before the spear goes through its body because the fish will sense danger and feel it hit the water and automatically move
Answer:
a)W= 1 J
b)W= 1 J
c)W= 0 J
Explanation:
Given that
m = 5 kg
Coefficient of kinetic friction,K=0.5
d= 10 cm
We know that if velocity is constant it means that the acceleration of the system is zero.Or we can say that all forces are balance in the system.
We know that work is the dot product of force and displacement
W= F.d
The friction force on the box
Fr= K m g
Fr= 0.5 x 5 x 10 = 25 N ( take g =10 m/s²)
Fr=25 N
a)
Acceleration a= 0
So horizontal force F = Fr
W = Fr.d
W=10 x 0.1 J
W= 1 J
b)
The work done by friction force
W= 1 J
c)
The net force on the system is zero because acceleration is zero.
F= 0
So
W= 0 J
The work done for moving a charge is due to the change in potential between the points. That is the work done is given by the expression W = qΔV. Where q is the charge and ΔV is the change in potential between two points.
In case of equipotential lines the value of potential is same at all the points.
So the value of ΔV when moving along a equipotential line is zero.
So W = qΔV = q*0=0
So no work is needed to move charge along an equipotential line.
Work done = 0
Answer:
No
Explanation:
walking requires friction because if friction did not exist we would slide around without stopping
