Answer: a) Moment = 200N.m
b) F = 500N
Explanation: <u>Moment</u> or <u>Torque</u> is the tendency of a body to rotate because of an aplplied force. It can be calculated as

F is force applied
r is distance from the force to the point of rotation
θ is the angle formed between force and distance
a) Since F and r are perpendicular, θ=90°, sin90° = 1, so


200
<u>Torque</u><u> caused by weight of the barrier at the pivot is </u><u>200N.m</u>
<u />
b) Counterweight has the same torque as pivot:
200
So, to find Force necessary to balance the weight:



F = 500
<u>It is necessary </u><u>a force of 500N</u><u> from the counterweight to balance the weight.</u>
<u />
Answer:
t = 12 s
Explanation:
To find the time in which the police reaches the thief you write the equation of motion of both thief and police:
The thief has a constant velocity, the position is then given by:
(1)
The police has an acceleration, then the position is:
(2)
the time in which the police reaches the thief is when their positions are equal, that is, when expression (1) equals expression (2). But before you calculate the acceleration of the police:

you replace this values in (2) and you equal the expression (1) and (2) (with vo = 0):

one root is t = 0s, but it is omitted because is the momment in which the thief pass in front of the police. The other root is:

hence, the time is 12 s
Well, since your mom is as fat as the earth, I’m guessing the carbon atom will go to your mom next
Answer:
How is the rational inertia defined.
Answer. A
Longitudinal wave is a wave in which the motion of the medium's particles is parallel to the direction of the energy transport.