Answer:
b) the second at the doorknob.
Explanation:
The torque applied by a force is given by the equation
where
is the torque
is the component of the force perpendicular to the direction between the axis of rotation and the point of application of the force
d is the arm (the distance between the axis of rotation and the point of application of the force)
In this problem, we have two equal forces F both applied perpendicular to a door, so
The first force is applied at the midpoint of the door; if we call L the width of the door, then the arm of this force is , so the torque applied by this first force is
The 2nd force instead is applied at the doorknob, so the arm in this case is L:
d = L
So, the torque exerted by the second force is
Therefore, we see that the 2nd force exerts a greater torque.
Answer:
it cannot be considered a physical change because it occur from the chemical reaction.
Explanation:
because physical change is the change of the size,volume, density,flexibility. in other words its a change in the outer appearance or change in which we can see or feel without using a tool or a machine
hope it help just my opinion
Answer:
22N West
Explanation:
45-23 because they are in opposite directions.