Answer:
the power used by the person is 17 W.
Explanation:
Given;
applied force, F = 51 N
distance through which the chair is used, d = 5 m
time of motion, t = 15 s
The power used by the person is calculated as;
Therefore, the power used by the person is 17 W.
Answer:
(a). The local surface charge density at the point on the surface where the radius of curvature of the surface is greatest is 123.9 nC/m².
(b). The local surface charge density at the point on the surface where the radius of curvature of the surface is greatest is 654.9 nC/m².
Explanation:
Given that,
Electric field
Electric field
When the radius of curvature is greatest, the electric field at the surface will be smaller.
Where the radius of curvature is greatest
(a). We need to calculate the local surface charge density at the point on the surface
Using formula of charge density
Put the value into the formula
The local surface charge density at the point on the surface where the radius of curvature of the surface is greatest is 123.9 nC/m².
(b). We need to calculate the local surface charge density at the point on the surface where the radius of curvature of the surface is smallest
Using formula of charge density
Put the value into the formula
The local surface charge density at the point on the surface where the radius of curvature of the surface is greatest is 654.9 nC/m².
Hence, (a). The local surface charge density at the point on the surface where the radius of curvature of the surface is greatest is 123.9 nC/m².
(b). The local surface charge density at the point on the surface where the radius of curvature of the surface is greatest is 654.9 nC/m².