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The question is as the attachment...
May i know if i want to find the angular speed of the rod when it inclined at certain angle, or at horizontal, can i use the [tex]\varpi[/tex]^2=[tex]\varpi[/tex]_0^2+2[tex]\alpha[/tex][tex]\vartheta[/tex]?
Attempt: I used it, and used conservation of energy, the latter produces right answer, but i don't know why first one won't work. Any clues?
May i know if i want to find the angular speed of the rod when it inclined at certain angle, or at horizontal, can i use the [tex]\varpi[/tex]^2=[tex]\varpi[/tex]_0^2+2[tex]\alpha[/tex][tex]\vartheta[/tex]?
Attempt: I used it, and used conservation of energy, the latter produces right answer, but i don't know why first one won't work. Any clues?
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