Answer:
C. X: Allows current to flow into the commutator
Y: Conducts current to the armature and reverses direction of current
Explanation:
Carbon brush is a motor brush that acts as the conducting block for current between the stator and the rotor of a motor.It is made of carbon blocks.The brush is held in place using a spring that ensures its contact position with the commutator.The commutator prevents the torque on the motor from reversing whenever the coil is rotating in the magnetic field.
Answer:
0.1308
Explanation:
To keep the rider from sliding down, then the friction force 
must at least be equal to gravity force 
where μ is the coefficient, N is the normal force acted by the rotating cylinder, m is the mass of a person and g = 9.81 m/s2 is the gravitational acceleration.
According to Newton's 3rd and 2nd laws, the normal force would be equal to the centripetal force 
, which is the product of centripetal acceleration 
and object mass m
Therefore
The centripetal acceleration is the ratio of velocity squared and the radius of rotation
Therefore
Since V is 5 times larger than C
A) 0V = 25C
25C to 0C = -25
-25 / 5 = -5
so 0C = -5 V
B)
20V x 5 = 100 C
Answer:
An object at rest remains at rest, or if in motion, remains in motion at a constant velocity unless acted on by a net external force.
Explanation:
Meaning that if an object is just sitting somewhere unless something else causes it to move it's not going anywhere.
