A physics student pulls a block of mass m = 22 kg up an incline at a slow constant velocity for a distance of d = 4.5 m. The incline makes an angle ? = 32° with the horizontal. The coefficient of kinetic friction between the block and the inclined plane is µk = 0.3.
1) What is the work Wm done by the student?
2) At the top of the incline, the string by which she was pulling
the block breaks. The block, which was at rest, slides down a
distance d = 4.5 m before it reaches a frictionless horizontal
surface. A spring is mounted horizontally on the frictionless
surface with one end attached to a wall. The block hits the spring,
compresses it a distance L = 0.7 m, then rebounds back from the
spring, retraces its path along the horizontal surface, and climbs
up the incline.
What is the speed v of the block when it first reaches the
horizontal surface?
v =
3) What is the spring constant k of the spring?
k =
4) How far up the incline d1 does the block rebound?
d1 =
a)
and the distance is 4.5 m
b)
c)
since L=0.7 m
solve for k
d) Again with energy
solve for d
A physics student pulls a block of mass m = 22 kg up an incline at...
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