Test 4
Question 1 0 / 1 pts Three boxes with identical masses slide on a rough floor with a kinetic friction coefficient μ k = 1 . They are connected by massless ropes which pull them to the right with an acceleration that happens to be equal to g/2 , where g is the acceleration of gravity. What is the magnitude of the tensions in the ropes?
You Answered | T 1 → | = 3 2 m g | T 2 → | = m g | T 3 → | = 1 2 m g | T 1 → | = 3 2 m g | T 2 → | = 5 2 m g | T 3 → | = 7 2 m g
Correct Answer

| T 1 → | = 9 2 m g | T 2 → | = 3 m g | T 3 → | = 3 2 m g | T 1 → | = 3 2 m g | T 2 → | = 3 2 m g | T 3 → | = 3 2 m g | T 1 → | = m g | T 2 → | = 1 2 m g | T 3 → | = 1 4 m g
Question 2 1 / 1 pts A box of mass m A =10.0 kg is placed on a table with a rough surface. The box connected by a string to a hanging mass m B =5.0 kg, as shown in the figure. The string mass can be neglected. The pulley is frictionless and has a negligible mass. What is the minimum possible value of the coefficient of static friction μ s if the objects are not moving?
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