Physics - November 2006

A yo-yo has a rotational inertia of 950 g cm^2 and a mass of 120 g. Its axle radius is 3.2 mm, and its string is 120 cm long. The yo-yo rolls from rest down to the end of the sting.

(a) What is the magnitude of its translational acceleration?

(b) How long does it take to reach the end of the string?

As it reaches the end of the string, what are its (c) translational speed, (d) translational kinetic energy, (e) rotational kinetic energy, and (f) rotational speed?

What equations did you use to solve this, and can you explain your answers?

2006-11-14 04:39:41 · 1 answers · asked by Anonymous

2006-11-14 04:34:35 · 9 answers · asked by samanthavanheerden 1

Consider a 66-cm-diameter tire on a car traveling at 80 km/h on a level road in the positive direction of an x-axis.

Relative to a woman in the car, what are (a) the translational velocity v and (b) the magnitude a of the translational acceleration of the center of the wheel?

What are (c) v and (d) a for a point at the top of the tire?

What are (e) v and (f) a for a point at the bottom of the tire?

Now repeat the questions relative to a hitchhiker sitting near the road: What are (g) v at the wheel’s center, (h) a at the wheel’s center, (i) v at the tire top, (j) a at the tire top, (k) v at the tire bottom, and (l) a at the tire bottom?

What equations would you use to solve this, and can you show your work?

2006-11-14 04:06:09 · 5 answers · asked by Anonymous

2006-11-14 03:58:44 · 1 answers · asked by goring 6

2006-11-14 03:55:05 · 1 answers · asked by goring 6

2006-11-14 03:48:15 · 1 answers · asked by goring 6

2006-11-14 03:45:24 · 1 answers · asked by goring 6

i want to become an astronomer and i am looking 4 the right course. i m in the 10th std

2006-11-14 03:04:35 · 5 answers · asked by vidhi j 1

A o digrees B 40 digrees C 80 digrees D 90 digrees

2006-11-14 02:57:52 · 3 answers · asked by margaret 1

2006-11-14 02:48:00 · 6 answers · asked by aly 1

That was a multiple choice question from a past physics paper. The question intrigued me:

Sounds are made by vibrating objects. A certain object vibrates but person nearby cannot hear any sound. Which statrement is correct?
A) The amplitude of the sound waves is too large.
B) The frequency of the vibration is too high.
C) The sound waves are transverse.

Only one of the above answers is correct. Can you tell me the answer but I also want an explanation why. The explanation is very important since the first 2 options appear correct to me. Plz help!

2006-11-14 02:43:24 · 3 answers · asked by Y L 2

speed of sound

2006-11-14 02:40:31 · 17 answers · asked by Eirlys Wyn T 1

i need some questions on superconductivity?it should not be very complicated.
What is Meissner effect?
Give some applications of superconductors?
What is Josephson Junction.

These are few questions i have i need more.

2006-11-14 02:33:37 · 1 answers · asked by nauroze_hoath 2

I've unplugged everything in my room and it's still there. Could it be electrical wiring inthe wall? If so, is there anything i can do about it. It's not very loud but it's driving me nuts me nuts.

2006-11-14 02:24:48 · 11 answers · asked by bavwill 3

end where this force is applied, what force needs to be applied at the other end to keep the bar balanced?

2006-11-14 02:13:16 · 2 answers · asked by zoelee24_2003 1

i REALLY NEED SOME HELP WITH MY PHYSICS HOMEWORK AND i dont know how to find the voltage of a device such as a FRIDGE. IT HAS 250 W and thats all i have now how do u find the volatge is there a rule ALL i can find is V=IR but i havent got r!! HELP!

2006-11-14 02:05:06 · 6 answers · asked by tashnatjuly69 1

2006-11-14 02:00:39 · 5 answers · asked by Raza K 1

I cannot understand biot-savart law clearly.i visit wikipedia,but it's not sufficient to understand.Please explain me biot-savart law clearly as you can.(with easy example)

2006-11-14 01:32:38 · 2 answers · asked by star123 2

Astrologers for centuries have used the planets to predict events. If gravity is believed to have properties that we don't understand and only physicists are theorizing, is it possible that gravity can affect mood or the displacement of mood?

2006-11-14 01:16:20 · 6 answers · asked by instantanything 1

Question 2 text 2. A rod, 1.60 m long, is pinned so it can rotate about an axis 0.500 m from the left end (thin, negligible mass rigid rod). This rod is on a level table top. Force one, a push applied to the left end of the rod, is perpendicular to the length of the rod, and has a magnitude of 20.0 N. Force 2, a push applied to the right end of the rod, is applied at an angle of 30.0 degrees outward from a perpendicular line at the end of the rod where the force is being applied, and has a magnitude of 35.0 N. Find the net torque (magnitude and direction) applied to the rod.
Question 2 answers
9.42 N*m, clockwise
29.6 N*m, Clockwise
17.8 N*m, Counterclockwise
23.3 N*m, counterclockwise

2006-11-14 00:59:13 · 1 answers · asked by HowDoUGetOut 1

2006-11-14 00:58:27 · 3 answers · asked by rey m 1

2006-11-14 00:45:17 · 6 answers · asked by KEL971 2

2006-11-14 00:43:43 · 1 answers · asked by KEL971 2

A 3 kg blob of putty moving at 6 m/s slams into a 2 kg blob of putty at rest.
Calculate the speed of the two stuck together blobs of putty immediately after colliding in m/s.

2006-11-14 00:20:39 · 2 answers · asked by Anonymous

2006-11-14 00:13:24 · 4 answers · asked by Link 4

2006-11-13 23:59:59 · 7 answers · asked by Khaleck 1

I am trying to get to grips with, from nothing comes something. As light is the begining of all life, what created the spark? This is way before the big bang. No atoms, no electromagnetic pulses, etc. Nothing has only one density, nothing......I am fed up with going round in circles in my head!

2006-11-13 22:56:24 · 16 answers · asked by Spoonraker 3

a record player is switched from 33rpm to 45rpm.The artable changes speed in 2.0s.Calaculate its average angular acceleration and the average tangential acceleration of a point on the turnable that 15cm from the axis rotation.

2006-11-13 22:36:33 · 2 answers · asked by gen 2

If the car continues to slow down in this way, after what further distance will it be brought to rest?

2006-11-13 21:58:18 · 9 answers · asked by Alexander M 1

2006-11-13 21:42:25 · 6 answers · asked by Alexander M 1