Answer:
1000 N/C
Explanation:
Potential difference, V = 60 V
Distance between the plates, d = 6 cm = 0.06 m
The electric field between the plates is given by
E = V / d
E = 60 / 0.06 = 1000 N/C
Thus, the electric filed between the plates is 1000 N/C.
The frictional force required is 9000 N
Explanation:
In order to keep the car in the turn in circular motion without sliding, the frictional force must provide the centripetal force necessary for the circular motion.
Therefore, we can write:

where the term on the left is the frictional force while the term on the right is the centripetal force, and where:
m is the mass of the car
v is its speed
r is the radius of the curve
For the car in this turn, we have
m = 1000 kg
v = 30 m/s
(since the diameter is 0.20 km, the radius is half that value)
And substituting, we find

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Answer:
-322.64 J
Explanation:
75 N * cos 125 * 7.5 = -322.64 J