Welcome :: Homework Help and Answers :: Mathskey.com
Welcome to Mathskey.com Question & Answers Community. Ask any math/science homework question and receive answers from other members of the community.

13,433 questions

17,804 answers

1,438 comments

47,233 users

Algebra Based Physics Hw Help?

+2 votes

A 4.47 kg block initially at rest is pulled to the right along a horizontal surface by a constant, horizontal force of 15.4 N. The coefficient of kinetic friction is 0.133.
The acceleration of gravity is 9.8 m/s2 .
Find the speed of the block after it has moved 3.39 m.

asked Feb 16, 2013 in PHYSICS by anonymous Apprentice

1 Answer

+2 votes
 
Best answer

Let us draw the free-body diagram of the block,

-------------------------------------------------------------------------------

To calculate normal force using equilibrium equation in y-direction

ΣFy=0:

N-W=0

N-mg=0

N=mg

Here m is the mass and g is the acceleration due to gravity.

Substitute m=4.47 kg and g=9.8 m/s^2 in above equation,

N=4.47x9.8=43.806 N

-------------------------------------------------------------------------------

Frictional force,Ff=μkN

μk=Coefficient of kinetic friction

Ff=0.133x43.806=5.826 N

Using almbert principal in x-direction

ΣFx=ma

Ff=ma---->a=Ff/m

a=5.826/4.47=1.3034 m/s^2

-------------------------------------------------------------------------------

Using motion equation

v^2-u^2=2as

v^2-0=2x1.3034x3.39

 v^2=8.837

v=2.973 m/s

speed of the block after it has moved 3.39 m.is 2.973 m/s

 

I hope that helps u

 

 

 

 

answered Feb 16, 2013 by bradely Mentor
selected Feb 17, 2013 by anonymous
thank u very much

Related questions

...