- #1
_buddha
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Hello everyone I am stuck on this question, hopefully someone can help me out, here is the question:
2kg block is sitting on surface while 3kg block is hanging.
So far this is what I am thinking, the 2 blocks acts as a system, initially the block is 1.5m high, so mgy gives me the initial potential energy and when that block falls the velocity gives me the kinetic energy. So the kinetic energy plus the thermal energy(friction) should equal my initial potential energy. So this is what I have ..
mgy = 1/2mv^2 + fkd
73.5 = 36.1 + fkd
Fkd = 37.4 J
Which is wrong, the answer is -8.0 J.
2kg block is sitting on surface while 3kg block is hanging.
So far this is what I am thinking, the 2 blocks acts as a system, initially the block is 1.5m high, so mgy gives me the initial potential energy and when that block falls the velocity gives me the kinetic energy. So the kinetic energy plus the thermal energy(friction) should equal my initial potential energy. So this is what I have ..
mgy = 1/2mv^2 + fkd
73.5 = 36.1 + fkd
Fkd = 37.4 J
Which is wrong, the answer is -8.0 J.
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