ooo Verizon 1:23 AM 29%, D session masteringphysics.com C Phy 201 Spring 2016 Ni

Question

ooo Verizon 1:23 AM 29%, D session masteringphysics.com C Phy 201 Spring 2016 Night Problem 4.57 The block shown in has mass m 70 ks and lies on a fixed smooth frictionless plane tited at an angle e 27.0 to the horizontal. Part A Determine the acceleration of the block as it slides down the plane, Express your answer to three significant figures and include the appropriate units. Dalue Units Submit My Answers give up Part B If the block starts from rest 12.6 up the plane from its base, what will be the block's speed when it reaches the bottom of the incline? Express your answer to three significant figures and include the appropriate units. Submit My Answers

Explanation / Answer

Part a

As the block is accelerated in x direction the force acted upon the block is

Fx= mgsin-N

Where, =coefficient of friction,

As the plane is smooth frictionless

F=mg sin

ma=mgsin

a=gsin=4.449m/s2

Part B

as the block is at rest at distance x= 12.6m from the base. Thus its initial velocity =0m/s

using the kinematical equation

v2=vo2+2ax

=112.1174

vfinal=10.588m/s

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