Part B What is the coefficient of kinetic friction? Express your answer using tw

Question

Part B What is the coefficient of kinetic friction? Express your answer using two significant figures. ANSWER: Problem 5.06 Part A FIGURE 5-4 A 4.00-kg block rests between the floor and a 3.00-kg block as shown in Fig. 5-4. The 3.00-kg block is tied to a wall by a horizontal rope, If the coefficient of static friction is 0.800 between each pair of surfaces in contact, what force must be applied horizontally to the 4.00-ig block to make move? ANSWER 23.5N 78.5 N 54.9 N 21.1 N 16.2 N Score Summary: Your score on this assignment is 0.0%. You received 0 out of a possible total of 11 points. Email

Explanation / Answer

5.06

given M = 4 kg
m = 3 kg
coefficent of static friction = u = 0.8

for the block M to move
applied foce = F
then
friction between middle surface = f
friciton between lower surfaces = f'
tension in rope =T

then from force balance
F - f' - f = 0

also
T = f

now from static friction condition
f' = (m + M)ug
f = mug
hence

F = f' + f = ug(2m + M) = 78.48 N
hecne optikn B . is the correct answer

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