8. Consider the system shown in figure. Block A weighs 45.0 N and block B weighs 25.0 N. Once block B is set into downward motion, it descends at a constant speed. (a) Calculate the coefficient of kinetic friction between block A and the tabletop. (b) A cat, also of weight 45.0 N, falls asleep on top of block A. If block B is now set into downward motion, what is its acceleration (magnitude and direction)? -2.13 m/s^2 -4.56 m/s^2 -6.78 m/s^2 -8.45 m/s^2 No Answer A

= 4. Consider the figure below, which has two objects of mass mi 3 kg connected by a taut rope. m2 Fp m2 Frictionless Finger Ms, Mk = The ramp is at an angle of 0 40° and has the peculiar property that it is frictionless along the tilted surface, but not along its vertical surface. (a) Ignore Fp for this part. What are the magnitude and direction of the acceleration experienced by the two objects? What is the magnitude of the tension force from the rope? (b) As the objects are moving, you apply a force on object 2 (using a frictionless finger) with magnitude Fp 50 N directly leftward (as seen in the figure). Upon doing this, you observe that the objects now move with constant speed. What is ? m₁ Frictionless 5 kg and

A lamp hangs vertically from a cord in a descending elevator that decelerates at 1.7 m/s2. (a) If the tension in the cord is 63 N, what is the lamp's mass? (b) What is the cord's tension when the elevator ascends with an upward acceleration of 1.7 m/s2?

A 2140 kg car traveling to the west at 17.1 m/s slows down uniformly. How long would it take the car to come to a stop if the force on the car is 8560 N to the east? Let East be positive.Answer in units of s. What is the car’s displacement during the time it takes to stop?Answer in units of m.