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Help with Physics Problem?
Two blocks are connected by a string which passes over a friction less pulley at the top of a ramp. The ramp is inclined 35 degrees. The block on the ramp has a mass of 5.7kg and has friction between the ramp with a coefficient of kinetic energy of μk=0.20. If the block hanging over the end of the ramp has a mass of 4.5kg, find the acceleration of the block on the ramp.
1 Answer
- NCSLv 75 years agoFavorite Answer
The block definitely moves.
The motive force due to the hanging mass:
Fm = 4.5kg * 9.8m/s² = 44.1 N
and the resistance due to the mass on the incline is
Fr = 5.7kg * 9.8m/s² * (sin35º + 0.2*cos35º) = 41.2 N
so the net force is
Fnet = Fm - Fr = 2.9 N
and so the acceleration
a = Fnet / totalmass = 2.9N / 10.2kg = 0.29 m/s²
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