Class Management I Help Homework 8 Unit 2 Review Begin Date 3/10/2016 600 PM-Due

Question

Class Management I Help Homework 8 Unit 2 Review Begin Date 3/10/2016 600 PM-Due e: 3/22/2016 11:59:00 PM End Date: 3/23/2016 6:00:00 AM (9 Problem 6: A box of mass m rests on a slope inclined by angle 0, with coefficient of static friction p between the block and the plane. A 33% Part (a) which of the following is true about the m of the frictional force.f7Cloonethe best answer Assume wis smaller than 1. Grade Summary 100% I give up! Submissions Hints: deduction per hint. Hints remaining: 3. Feedback: deduction per feedback. per attempt) iw 33% Part (b) What is the magnitude of the frictional force? It is in terms of the angle o 33% Part (c) What is the Newton's third law pair to the weight of the box? Choose the best answer.

Explanation / Answer

Frictional Force is given by, Fr = m*g*cos()

So,
a)
As 0 < cos() < 1
Friction Force, < m*g

b)
Magnitude of Frcitional Force, Fr = m*g*cos()

c)
Newton's third law is: For every action, there is an equal and opposite reaction.
Normal Force is
N = m*g*cos()

7(A)
r = 5.5 m
Ac = 1.5*g

v^2/r = 1.5*g
v^2 = 1.5*9.8*5.5
v = 8.99 m/s

w = v/r = 8.99/5.5 rad/s
w = 1.63 rad/s

Now 1 rev = 2* rad
1 rad = 1/2

Speed in rpm, = (1.63)/(2*) * 60 rpm
Speed in rpm, = 15.56 rpm

please post seperate questions in seperate post only,

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