(NO LINKS) A carpenter strikes a nail with a hammer, pushing it into wood. What are the forces in the force pair for this example?

A. the force applied by the nail on the wood
the force applied by the hammer on the carpenter
B. the force applied by the nail on the wood
the force applied by the nail on the hammer
C. the force applied by the hammer on the nail
the force applied by the hammer on the carpenter
D. the force applied by the hammer on the nail
the force applied by the nail on the hammer

The 5-kg cylinder is initially at rest when it is placed in contact with the wall b and the rotor at a. if the rotor always maintains a constant clockwise angular velocity v = 6 rad> s, determine the initial angular acceleration of the cylinder. the coefficient of kinetic friction at the contacting surfaces b and c is mk = 0.2.

Consider a double atwood machine constructed as follows: a mass 4m is suspended from a string that passes over a massless pulley on frictionless bearings. the other end of this string supports a second similar pulley, over which passes a second string supporting a mass of 3m at one end and m at the other. using two suitable generalized coordinates, set up the lagrangian and use the lagrange equations to find the acceleration of the mass 4m when the system is released. explain why the top pulley rotates even though it carries equal weights on each side.

What is the name of the perceived change in a sound wave’s frequency due to motion between the observer and the sound source?