Hi.
The St Anthony Physics blog is for current St Anthony students & alumni to talk about physics stuff. St. Anthony Physics alumni can email me: plulai@stanthony.k12.mn.us
In the past, I had members choose their favorite physicist as their user name. That is an option for alumni. It is required of current students.
Thursday, March 24, 2011
Hey.
We will see if this works. Try sending any question you have through the blog page instead of emailing me. Maybe we'll get something productive out of a blog.
Choose a name. Use the list of physicists on this page as a guide: Nobel Prize Winners in Physics http://nobelprize.org/nobel_prizes/physics/laureates/
Found the packet. This is the question with the spring that has a 3kg mass to stretch it. That is replaced with a 4 kg mass to oscillate the system. Compare the energy the spring will have when the 4kg mass has the spring stretched to its max with the energy the spring has when it is at its max height. You can use the 3kg mass to determine a property of the spring.
I used the 3 kg mass and compared the initial gravitational potential energy to the elastic energy when the spring is stretched. I found that K is 5 for the spring, but when I used that for the 4 kg one, i got 16 cm, which isnt an answer
The big part of the question is trying to get at what is going on with the 4kg mass.
The 3kg mass is there so you can determine properties of the spring. There is really only one spring property that we really worry about. Try using forces for that spring property.
When the 4kg mass is at the bottom, i'd make that the spot where h=0 (for Egp). When the 4kg spot is at the top, it would have Egp at a max. Those should be the only energy types that exist at each point.
I missed class tuesday and I'm working on the mirrors and lens packets. How do you find the height of the image without knowing the height of the object?
Choose a name. Use the list of physicists on this page as a guide: Nobel Prize Winners in Physics
ReplyDeletehttp://nobelprize.org/nobel_prizes/physics/laureates/
Oops, i didn't see that post with the link of names. I couldn't decide on a physicist so I just picked a random thing
ReplyDeleteI didn't see the list either, but I think Archimedes would have had a shot at a Nobel Prize had he been born a little later.
ReplyDeleteWhat a great name: Felix Bloch
ReplyDeleteNo Questions posted as of 7:02 Sunday night. I am hoping that means things are going well.
ReplyDeleteplulai.
Mr Lulai, i dont know if you have a mechanics review packet available, but I need help with number 38 on page 14
ReplyDeleteLooking for it. back in a minute...
ReplyDeleteFound the packet.
ReplyDeleteThis is the question with the spring that has a 3kg mass to stretch it. That is replaced with a 4 kg mass to oscillate the system.
Compare the energy the spring will have when the 4kg mass has the spring stretched to its max with the energy the spring has when it is at its max height.
You can use the 3kg mass to determine a property of the spring.
I used the 3 kg mass and compared the initial gravitational potential energy to the elastic energy when the spring is stretched. I found that K is 5 for the spring, but when I used that for the 4 kg one, i got 16 cm, which isnt an answer
ReplyDeleteThe big part of the question is trying to get at what is going on with the 4kg mass.
ReplyDeleteThe 3kg mass is there so you can determine properties of the spring. There is really only one spring property that we really worry about. Try using forces for that spring property.
When the 4kg mass is at the bottom, i'd make that the spot where h=0 (for Egp).
When the 4kg spot is at the top, it would have Egp at a max.
Those should be the only energy types that exist at each point.
Ok, thanks
ReplyDeleteGood luck.
ReplyDeleteYour welcome.
I missed class tuesday and I'm working on the mirrors and lens packets. How do you find the height of the image without knowing the height of the object?
ReplyDeleteWe are designating each line on the diagram as being 1cm apart.
ReplyDelete