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# HW8 - homework 08 RAHMAN TARIQUE Due 3:00 am Question 1...

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homework 08 – RAHMAN, TARIQUE – Due: Feb 20 2008, 3:00 am 1 Question 1, chap 6, sect 1. part 1 of 2 10 points A block of mass m is accelerated across a rough surface by a force of magnitude F that is exerted at an angle φ with the horizontal, as shown above. The frictional force on the block exerted by the surface has magnitude f . f F φ m What is the magnitude of the acceleration vectora of the block? 1. | vectora | = F m 2. | vectora | = F cos φ - f m 3. | vectora | = F - f m 4. | vectora | = F cos φ m 5. | vectora | = F sin φ - m g m Question 2, chap 6, sect 1. part 2 of 2 10 points Which of the following expressions for the coefficient of friction is correct? 1. μ = m g f 2. μ = f m g - F cos φ 3. μ = f m g - F sin φ 4. μ = f m g 5. μ = m g - F cos φ f Question 3, chap 6, sect 1. part 1 of 3 10 points A block is at rest on the incline shown in the figure. The coefficients of static and kinetic friction are μ s = 0 . 87 and μ k = 0 . 74, respectively. The acceleration of gravity is 9 . 8 m / s 2 . 27 kg μ 37 What is the frictional force acting on the 27 kg mass? Answer in units of N. Question 4, chap 6, sect 1. part 2 of 3 10 points What is the largest angle which the incline can have so that the mass does not slide down the incline? Answer in units of . Question 5, chap 6, sect 1. part 3 of 3 10 points What is the acceleration of the block down the incline if the angle of the incline is 44 ?

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HW8 - homework 08 RAHMAN TARIQUE Due 3:00 am Question 1...

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