- #1
terichristine
- 2
- 0
Homework Statement
Amadeus pushes horizontally on a desk that rests on a rough wooden floor. The coefficient of static friction between the desk and the floor is 0.800 and the coefficient of kinetic friction is 0.620. The desk has a mass of 94.0 kg. He pushes just hard enough to barely get the desk moving and continues pushing with that force for 6.00 s. What work does he do on the desk during that time (HINT: Since once movement starts, friction changes to sliding friction, which is less than maximum static friction, the desk will be accelerating. SO, use the 2nd law to find the acceleration, then find out far it went in 6 s...)?
Homework Equations
W f = f*d*cos(theta)
F=ma
F=u*mg
The Attempt at a Solution
I used F=u*mg to find the force to be 736.96N and used that to find the acceleration, F=ma=.128. Now I don't know what to do next. I know I need to find the displacement but I don't know how. The only equation I have is delta x=1/2atsubf^2 which yeilds delta x to be 2.304. 2.304*736.96= 1697.7 which is not the right answer. Thanks.