IP A 45- k g crate is placed on an inclined ramp. When the angle the ramp makes

Question

IP A 45-kg crate is placed on an inclined ramp. When the angle the ramp makes with the horizontal is increased to 30? , the crate begins to slide downward. Part A What is the coefficient of static friction between the crate and the ramp? Express your answer using two significant figures. ANSWER:   ?s = Part B At what angle does the crate begin to slide if its mass is doubled? Express your answer using two significant figures. ANSWER:   ?? =   ?   IP A 45-kg crate is placed on an inclined ramp. When the angle the ramp makes with the horizontal is increased to 30? , the crate begins to slide downward. IP A 45-kg crate is placed on an inclined ramp. When the angle the ramp makes with the horizontal is increased to 30? , the crate begins to slide downward. IP A 45-kg crate is placed on an inclined ramp. When the angle the ramp makes with the horizontal is increased to 30? , the crate begins to slide downward. Part A What is the coefficient of static friction between the crate and the ramp? Express your answer using two significant figures. ANSWER:   ?s = Part B At what angle does the crate begin to slide if its mass is doubled? Express your answer using two significant figures. ANSWER:   ?? =   ?   Part A What is the coefficient of static friction between the crate and the ramp? Express your answer using two significant figures. ANSWER:   ?s = Part A What is the coefficient of static friction between the crate and the ramp? Express your answer using two significant figures. ANSWER:   ?s = ANSWER:   ?s =   ?s = Part B At what angle does the crate begin to slide if its mass is doubled? Express your answer using two significant figures. ANSWER:   ?? =   ?   Part B At what angle does the crate begin to slide if its mass is doubled? Express your answer using two significant figures. ANSWER:   ?? =   ?   ANSWER:   ?? =   ?     ?? =   ?   Problem 6.25 Problem 6.25 Part A If the backpack begins to slide when the spring (k = 160N/m ) stretches by 2.40cm , what is the coefficient of static friction between the backpack and the table? ANSWER:   ?s = Part A If the backpack begins to slide when the spring (k = 160N/m ) stretches by 2.40cm , what is the coefficient of static friction between the backpack and the table? ANSWER:   ?s = Part A If the backpack begins to slide when the spring (k = 160N/m ) stretches by 2.40cm , what is the coefficient of static friction between the backpack and the table? ANSWER:   ?s = ANSWER:   ?s =   ?s =   ?s = F

Explanation / Answer

A. component of gravity along slope = friction force  
mgsin30 = u.mgcos30
u = 0.577

B. tanA = u
there is no role of mass ,
so angle = 30 degrees

C6.25   kx = friction force
160 (0.024) = u.59
u =0.065

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