GO A disk, with a radius of 0.25 m. is to be rotated like a merry-go-round through 800 rad, starting from rest, gaining angular speed at the constant rate α 1 through the first 400 rad and then losing angular speed at the constant rate −α 1 until it is again at rest. The magnitude of the centripetal acceleration of any portion of the disk is not to exceed 400 m/s 2 . (a) What is the least time required for the rotation? (b) What is the corresponding value of α 1 ?
GO A disk, with a radius of 0.25 m. is to be rotated like a merry-go-round through 800 rad, starting from rest, gaining angular speed at the constant rate α 1 through the first 400 rad and then losing angular speed at the constant rate −α 1 until it is again at rest. The magnitude of the centripetal acceleration of any portion of the disk is not to exceed 400 m/s 2 . (a) What is the least time required for the rotation? (b) What is the corresponding value of α 1 ?
GO A disk, with a radius of 0.25 m. is to be rotated like a merry-go-round through 800 rad, starting from rest, gaining angular speed at the constant rate α1 through the first 400 rad and then losing angular speed at the constant rate −α1 until it is again at rest. The magnitude of the centripetal acceleration of any portion of the disk is not to exceed 400 m/s2. (a) What is the least time required for the rotation? (b) What is the corresponding value of α1?
What is the resistance (in (2) of a 27.5 m long piece of 17 gauge copper wire having a 1.150 mm diameter?
0.445
ΧΩ
Find the ratio of the diameter of silver to iron wire, if they have the same resistance per unit length (as they might in household wiring).
d.
Ag
dFe
= 2.47
×
Find the ratio of the diameter of silver to iron wire, if they have the same resistance per unit length (as they might in household wiring).
d
Ag
= 2.51
dFe
×
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