- #1
Idividebyzero
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1.An ore car of mass 38000 kg starts from rest
and rolls downhill on tracks from a mine. At
the end of the tracks, 6.5 m lower vertically,
is a horizontally situated spring with constant
5.2 × 105 N/m.
The acceleration of gravity is 9.8 m/s2 .
Ignore friction.
How much is the spring compressed in stop-
ping the ore car?
2. W=F*D W=1/2 kx2
3. Started with 1/2kx2 the constant is given to us. work is also F*D here once it leaves the hill I considered it in free fall. so using force of gravity as F.
(m)(g)(d)=1/2kx2 and solved for x. this was incorrect. thought about the work-energy principle but i don't know any kinematic inforation other than g and the vertical displacement. any thoughts
and rolls downhill on tracks from a mine. At
the end of the tracks, 6.5 m lower vertically,
is a horizontally situated spring with constant
5.2 × 105 N/m.
The acceleration of gravity is 9.8 m/s2 .
Ignore friction.
How much is the spring compressed in stop-
ping the ore car?
2. W=F*D W=1/2 kx2
3. Started with 1/2kx2 the constant is given to us. work is also F*D here once it leaves the hill I considered it in free fall. so using force of gravity as F.
(m)(g)(d)=1/2kx2 and solved for x. this was incorrect. thought about the work-energy principle but i don't know any kinematic inforation other than g and the vertical displacement. any thoughts