A physics student is sitting on a rotating platform. He is holding a heavy weigh
ID: 1467686 • Letter: A
Question
A physics student is sitting on a rotating platform. He is holding a heavy weight in each of Ins outstretched hands. At request of his physics instructor(!) he carries out various manoeuvres to try to change his angular velocity. Which of the following scenarios are described correctly? Select True or False. A friend tlirows a third weight so that the student catches it in one of his outstretched hands. No matter what the direction of the tlirow. the student's angular velocity increases. A friend tlirows a third weight so that the student catches it in one of his outstretched hands. No matter what the direction of the tlirow. the student's angular velocity reverses. Starting with angular velocity omega gm he brings the weights in to his chest. His angular velocity decreases. Starting at rest, he drops the weights. His angular velocity decreases. Starting at rest, he brings the weights in to his chest. His angular velocity increases. Starting with angular velocity co^,. he drops the weights. His angular velocity decreases. Startmg at rest, he brings the weights in to his chest. His angular velocity decreases. Startmg with angular velocity omega gw he transfers both the weights to one outstretched hand. His angular velocity (after the manoeuvre is complete) has reversed. Startmg with angular velocity omega gw he raises his feet, and points them outwards from the chair as far as he can. His angular velocity decreases. Startmg at rest, he drops the weights. His angular velocity does not change.Explanation / Answer
A physics student is sitting on a rotating platform.
He is holding a heavy weight in each of his outstretched hands; which of the following scenarios are described correctly? Select True or False.!!!
All starting with angular velocity gw,
Aswers to all such question are related to angular momentum (L = J*) conservation !!! as far as a generic moment of inerzia Ji changes , then the relevant angular speed i will change as well in such a way that Ji*i = L = constant !!!
1) A friend throws a third weight so that the student catches it in one of his outstretched hands. No matter what the direction of the throw, the student's angular velocity increases.
FALSE ...it decreases due to J increase .
2)A friend throws a third weight so that the student catches it in one of his outstretched hands. No matter what the direction of the throw, the student's angular velocity decreases.
That's TRUE ....J increases and decreases .
3)he brings the weights in to his chest. His angular velocity decreases.
FALSE...if you decrease the radius, then J will decrease as well and will increase
4)he drops the weights. His angular velocity decreases.
FALSE ...as J decreases and will consequently increase
5)He brings the weights in to his chest. His angular velocity increases.
TRUE ...if you decrease the radius, then J will decrease as well and will increase
6)he drops the weights. His angular velocity decreases.
False ...it increases due to J decrease
7)he brings the weights in to his chest. His angular velocity decreases.
FALSE ...if you decrease the radius, then J will decrease as well and will increase
8)he transfers both the weights to one outstretched hand. He then stretches his other hand back out to its original position. His angular velocity (after the manouvre is complete) has reversed.
FALSE .
he transfers both the weights to one outstretched hand. He then stretches his other hand back out to its original position. His angular velocity (after the manouvre is complete) has not changed.
J and r won't change
9)he raises his feet, and points them outwards from the chair as far as he can. His angular velocity decreases.
False ...may be it will just slow a little bit
10)he drops the weights. His angular velocity not change.
FALSE ...as J decreases and will consequently increase
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