A cylinder of moment of inertia 0.09 kg. m2 can rotates about a horizontal, fixed axis. It is wrapped with a light string which is pulled by a constant force for a distance of 2 m. The final angular speed of the cylinder is 20 rad/s. Suppose the friction is negligible. a/ Find the magnitude of the force acting on the string.
b/ Knowing that the radius of the cylinder is 6 cm, find the linear speed of a point on the edge of the cylinder?

Which statement is true for light passing into a medium that is more optically dense than the first medium through which it past

When barack obama was running for president, at a campaign stop he tried to bowl, something he isn't very good at. the media loved it because he threw a gutter ball while they were all watching. this is an example of:

Learning goal: to understand newton's 1st law. newton's principia states this first law of motion: an object subject to no net force maintains its state of motion, either at rest or at constant speed in a right line. this law may be restated as follows: if the sum of all forces acting on an object is zero, then the acceleration of that object is zero. mathematically this is just a special case of the 2nd law of motion, f⃗ =ma⃗ , when f⃗ =0. when studying newtonian mechanics, it is best to remember the 1st law in two ways: if the net force (i.e., sum of all forces) acting on an object is zero, the object will keep moving with constant velocity (which may be zero). if an object is moving with constant velocity, that is, with zero acceleration, then the net force acting on that object must be zero. complete the following sentences to see if you can apply these ideas. part a if a car is moving to the left with constant velocity, one can conclude that