Answer:
C
Explanation:
because the rod is positive, it'll attract the negatives. leaving the positive to stay in the back
Answer: left and applied force
Explanation:
Answer:
B
Explanation:
B. Must be the answer I. E 10kg
Answer:
both technicians
Explanation:
parts of a machine that move against themselves need to be lubricated to reduce friction and heating in the system.
since friction causes heating and wearing away of parts, it is important to lubricate them.
engine bearings move against themselves, because the teeth on one moves another
Answer:
0.26087 rad/s
Explanation:
mass of the child (m) = 40 kg
velocity (v) = 3 m/s
distance (r) = 1.5 m
moment of inertia (I) = 600 kg.m^{2}
rotational momentum of the child = Iω
where
- moment of inertia of the child (I) = = 40 x 1.5 x 1.5 = 90 kg/m^{2}
- angular velocity (ω) = velocity / distance = 3 / 1.5 = 2 rad/s
rotational momentum of the child = Iω = 90 x 2 = 180 kg/s
from the conservation of momentum the initial momentum of the child must be the same as the final momentum of the child
initial momentum of the child = final momentum of the child
180 = (90 + 600) ω
180 = 690 ω
ω = 180 / 690 = 0.26087 rad/s