Physics Help Forum  

Go Back   Physics Help Forum > High School and Pre-University Physics Help > Kinematics and Dynamics

Reply
 
Thread Tools Display Modes
Old 02-19-2009, 09:20 AM   #1
climber123boy
Junior Member
 
Join Date: Feb 2009
Posts: 13
climber123boy is on a distinguished road
Tension in rope

I'm having a lot of trouble with this homework problem.

A 205kg log is pulled up a ramp by means of a rope that is parallel to the surface of the ramp. The ramp is inclined at 30 degrees with respect to the horizontal. The coefficient of kinetic friction between the log and the ramp is 0.900, and the log has an acceleration of 0.800 m/s^2. Find the tension in the rope.

a. 2730N
b. 904 N
c. 232 N
d. 1810N
e. 356N

Thanks for your help
climber123boy is offline   Reply With Quote
Old 02-19-2009, 03:56 PM   #2
tashirosgt
Senior Member
 
Join Date: Dec 2008
Location: Las Cruces NM
Posts: 256
tashirosgt will become famous soon enough
My opinion is:

Total force parallel to the ramp = (mass of log)(acceleration of log up the ramp)

Total force parallel to ramp also = (tension in string) - (component of gravity parallel to ramp) - (force of friction)

= (tension in string) - (component of gravity parallel to ramp) - (component of gravity normal to ramp)(coefficient of kinetic friction)
tashirosgt is offline   Reply With Quote
Reply

  Physics Help Forum > High School and Pre-University Physics Help > Kinematics and Dynamics

Thread Tools
Display Modes




Copyright © 2008-2012 Physics Help Forum. All rights reserved.