Each ball, when released, will fall toward the center of the big ball that everybody is standing on.
Another way to describe it: Each ball, when released, will fall in the direction parallel to a line from the boy's head to his feet.
-- The ball held by the boy on top will fall toward the bottom of the picture.
-- The ball held by the boy on the right will fall toward the left side of the picture.
-- The ball held by the boy on the bottom will fall toward the top of the picture.
-- The ball held by the boy on the left will fall toward the right side of the picture.
In each case, the direction toward the center of the big ball that they're all standing on is the direction that each person calls "down".
Answer:
A vector only has zero magnitude if and only if all its components are 0. Therefore, a vector can have non-zero magnitude if a component is zero.
Answer:
When the piano is dropped, the first force acting on it will be the gravitational force, that accelerates the piano at 9.8m/s^2 downwards.
As the piano accelerates, the velocity increases, now appears other force, the air resistance, that opposes to the motion of the piano.
As the velocity of the piano increases, also does the force that the air applies on the piano.
There is a point where the velocity of the piano is such that the air resistance is equal in magnitude, but in the opposite direction, to the force of gravity.
Then the net force on the piano is zero, which means that there is no acceleration, so the piano will keep falling down at constant velocity after this point.
Answer:
W = 83 [N] (weight)
Explanation:
We must clarify that the system is in static equilibrium, in such a way that we must perform a sum of forces on the Y-axis equal to zero, in order to determine the downward force corresponding to the weight of the child.
∑Fy = 0
![F_{1}+F_{2}-m*g=0\\18+65=m*g\\m*g = 83 [N]](https://tex.z-dn.net/?f=F_%7B1%7D%2BF_%7B2%7D-m%2Ag%3D0%5C%5C18%2B65%3Dm%2Ag%5C%5Cm%2Ag%20%3D%2083%20%5BN%5D)
And the mass can be determined as follows:
![m*g=83\\m = 83/9.81\\m=8.46[kg]](https://tex.z-dn.net/?f=m%2Ag%3D83%5C%5Cm%20%3D%2083%2F9.81%5C%5Cm%3D8.46%5Bkg%5D)
A). Archaea Hope it helps you
