Notice that for the record player in part (b), even though the angular speed is constant at all points along a radial line, the tangential speed steadily increases with increasing r. The calculation for a CD in part (c) is easy only because the linear (tangential) speed is constant. It would be considerably more difficult for a record player, where the tangential speed depends on the distance from the center. QUESTION Compare the angular acceleration of a CD player and a record player when playing a song. What will happen as the radius of the read head or the phonograph changes. (Select all that apply.) The CD's linear speed at the track being read varies with radius of the track. The record player has zero angular acceleration. The CD's angular speed changes to maintain the same linear speed at all radii. The record player's angular speed changes to maintain the same linear speed at all radii. The CD has zero angular acceleration. The record player's angular speed accelerates to maintain the same linear speed at all radii. PRACTICE IT
Use the worked example above to help you solve this problem. In a compact disc player, as the read head moves out from the center of the disc, the angular speed of the disc changes so that the linear speed at the position of the head remains at a constant value of about 1.3 m/s.
(a) Find the angular speed of the compact disc when the read head is at r1 = 1.7 cm and again at r2 = 4.6 cm.
ω1 = rad/s
ω2 = rad/s
(b) An old-fashioned record player rotates at a constant angular speed, so the linear speed of the record groove moving under the detector (the stylus) changes. Find the linear speed of a 45.0 rpm record at points r1 = 1.7 and r2 = 4.6 cm from the center.
v1 = m/s
v2 = m/s
(c) In both the CD and the phonograph record, the information is recorded in a continuous spiral track. Calculate the total length of the track for a CD designed to play for 1.0 h.
m
EXERCISEHINTS: GETTING STARTED | I'M STUCK!
Compute the linear speed of a record playing at 33 1/3 revolutions per minute at the following positions on the record:
(a) r = 1.7 cm
m/s
(b) r = 4.6 cm
m/s

elly's long hair:

a. if the salon only takes cash, then this isn't the problem. it doesn't matter how much she has in her checking account.   she can't get a haircut until she has the cash.

b. if she has overdraft protection, then there's no problem.   she can go ahead and write a check that her account can't cover, then sometime later, pay the bank some outrageous usury for loaning her a few bucks for a few days, but with beautiful hair.

c. if elly has some principles, and doesn't want to write a bad check, then now she has a problem.   her desire for the new hairstyle is in conflict with her honesty and integrity.

d.   if the bank will not process a check she writes, then even if she had a million $$ in her account, she couldn't use any of it.   the amount she has in her account is not the problem.   and if i may suggest, she might as well close her checking account, and put the money where it'll work for her.   it's not doing her a bit of good in a checking account, since she can't write any checks.

justin can't pay the full balance:

a. he can't even handle the credit limit he has now.   under no circumstances should he ask for a higher limit.

b.   he can ask for the grace period to be extended.   but that's no solution, the bank will almost certainly refuse anyway, and there are much better options.   he knew the rules of his credit card when he started using it.

c.   he definitely should pay the interest on the balance, plus as much of the balance as he can cover at the same time.

d.   he definitely should pay the minimum otherwise they could shut down his card.   he should also pay as much more as he possibly can.   he should also remember the awkward situation he's in, stop buying stuff on credit that he can't afford, and avoid adding any more debt.

i'd say that justin's best best option isn't on this list of choices.   what he has to do:   pay as much as he can at least the minimum payment plus as much more as he can and then avoid adding more debt.

falling water hydro = water .. spectcular places these plants are

i am pretty sure it is c because when people are closer together, they cannot move as freely. picture being in a mostly full elevator, for instance. the people are right next to you, and you can barely move.

cancer risk hope this