otal resistance of 3.25 Q is to be produced by connecting an unknown resistance to a 12.28 Q resistance. (a) What must be the value the unknown resistance, and (b) should it be connected in series or in parallel?

A 1490 N crate is resting on a table connected to a 400 N block through a frictionless pulley system as shown.  Friction between the crate and the table is enough to keep the system at rest.  The arrows show the forces that act on the crate and the block.

answer Q 5

Move over Jeff Bezos, this invention is about to make you the richest person in the world. You have just invented the OyOy (that's YoYo spelled backwards). It is the very latest in home safety and so easy to use! If your building is on fire, simply reach out and grab the cord on the Oyoy and you will be lowered safely toward the ground at a low velocity. The OyOy has a total mass M = 106.0 kg and is shaped like a cylinder of radius R = 0.835 meters. The secret to the operation of the OyOy is its patented shaft whose radius is only r = 0.0830 meters. The cord is wound around the small shaft and this is the secret to your low velocity. Outer Radius = R Spindle Radius = r Mass = M The FORMULA for the moment of Inertia: I = V(y=0)=? We will use the approximation that the shaft is of negligible mass compared to the total. This means that you can treat the entire OyOy as though it is a solid cylinder with mass M and radius R. Imagine that a customer of mass m = 77.5 kg is using the Oyoy and…