At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga.
Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus.
Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.
That's a tougher one...
:)) here's another question.. The work done by a force is the product of force and distance. Does this means that the torque and work are equivalent?
One reason for that - GIVING GYROSCOPIC STABILITY to the bullet . This stability is due to angular momentum.
When a body is spinning around some axis, we say the angular momentum is pointing along this axis with a magnitude equal to the magnitude of the angular momentum. When a body has angular momentum is some direction, much like with regular momentum, it doesn't like to have its magnitude or direction changed.
One particular note to this is precession, where the angular momentum of a body spins about a 3rd axis, but it doesn't like to have this 3rd axis changed either.
So, when the bullet has some spin, it has some angular momentum in the direction of its motion. This spinning adds stability, because the bullet itself doesn't want to turn on some other axis, thus changing the direction of its angular momentum, so it stays pointing straight. Since it stays pointing straight, it is more aerodynamic, so it flies for longer.
Not the answer you are looking for? Search for more explanations.
Answer to SECOND q (btw whre is the medl for the 1-st...) is as follows
Torque equals VECTOR-PRODUCT of FORCE-times-Distance-from center
WORK equals SCALAR product of FORCE-time-DITANCE. It means that :
Torque increases WIT the angle, because SIn alpha INCRESES with the angle.
In contrast- WORK DECREASES with the angle because Cos alpha decreases with the angle