Physics - November 2006

A yo-yo shaped device mounted on a horizontal frictionless axis is used to lift a 30 kg box as shown. The outer radius R of the device is 0.50 m, and the radius r of the hub is 0.20 m. When a constant horizontal force Fappof magnitude 140 N is applied to a rope wrapped around the outside of the device, the box, which is suspended from a rope wrapped around the hub, has an upward acceleration of magnitude 0.80 m/s2. What is the rotational inertia of the device about its axis of rotation?

2006-11-27 06:56:03 · 1 answers · asked by Galaxy D 2

The velociraptor spots you 40 meters away and attacks, accelerating at 4 m/s^2 up to its top speed of 25 m/s. When it spots you, you begin to flee, quickly reaching your top speed of 6 m/s. How far can you get before you're caught and devoured????????? pls answer...

2006-11-27 06:23:13 · 3 answers · asked by MaxTunk 3

Electricity appears to bring instant power. But it must take a measurable amount of time to go from ON to Off.
If you had a switch and a light millions of miles apart but could see them both at the same time, would it still appear instant?
Would the answer be the same even if the link between them was a perfect conductor of electricity?

2006-11-27 06:10:35 · 11 answers · asked by cisco kid 1

The intensity level of sound 20 m from a jet airliner is 120 dB. At what distance fro mthe airplane will the sound intensity level be a tolerable 100 dB? (Assume spherical spreading of sound.)

2006-11-27 05:31:51 · 3 answers · asked by Anonymous

2. Which of the following statements best explains the key difference between velocity and speed?

a. Velocity must be reported in m/s, but speed can have other distance time units.
b. Velocity depends on direction, speed does not.
c. Objects can have different speeds if they are moving with the same velocities, but not different velocities if they are moving with the same speeds.
d. Due to Earth’s gravity, an object’s velocity will always be slightly larger than its speed.

2006-11-27 05:29:03 · 7 answers · asked by Dillon L 1

1. Velocity is known as a vector quantity. What does this tell us about velocity?

a. Velocity will always be positive.
b. Velocity is instantaneous.
c. Velocity will have size and direction.
d. Velocity is the same as acceleration.

2006-11-27 05:24:16 · 9 answers · asked by Dillon L 1

Level : 2nd year university ...

2006-11-27 05:19:41 · 2 answers · asked by jimy86Leb 2

What sound level change corresponds to a factor of two change in intensity?
A. 0.5 dB
B. 2 dB
C. 3 dB
D. 5 dB

2006-11-27 04:42:46 · 2 answers · asked by Anonymous

do u know how long it takes for an airbus A380 (or any commercial aeroplane for that matter) to accelerate to its maximum cruising speed? do not include the time taken by the plane while taxying because that can vary. i just need the approximate time taken to accelerate to maximum speed.
i need to use it in the thrust equation for some physics homework.
pls give me an accurate answer....i've been searching the web for a long time but maybe i'm not looking in the right places....

2006-11-27 04:31:50 · 2 answers · asked by amandac 3

I need to invert an n*n matrix where the values down the main diagonal are all equal to zero. I've tried usingh numerical recipes such a Lower/Upper decomposition and Singular Value Decomposition, yet these seem to give out an error message. Is it actually possible to calculate the inverse of such a matrix?

2006-11-27 04:31:22 · 3 answers · asked by RobLough 3

2006-11-27 04:30:31 · 2 answers · asked by Anonymous

a stuntman on a motorcycle plans to ride at top speed (30m/s) up and off a ramp 2m high inclined @ 45 degrees to the horizontal. calculate the distance travelled from the ramp to the point of impact on the ground.

step up step answers only ppls.

2006-11-27 04:16:20 · 4 answers · asked by Riddlebox 2

If i had a plane that went from new york to los angeles in 5 seconds and then someone else to go in 1 second is it then possible for someone to make one to make the trip in negative -5 seconds.

2006-11-27 04:15:01 · 7 answers · asked by Eric G 2

2006-11-27 04:11:11 · 4 answers · asked by gravesituation 1

please talk english I have a 2.0 and do not understand big words

2006-11-27 04:00:44 · 4 answers · asked by Anonymous

I know it sounds like a silly question...
but Stephen Hawking posed this question in one of
his lectures and it reallys stuck with me when I
heard it.

Why do things in the Universe fall OUT of order
why don't they fall INTO order? Does it have
to do with the space time continuum?

2006-11-27 03:48:15 · 11 answers · asked by Anonymous

I'm trying to find the relationship between the God theory and entanglement

2006-11-27 03:25:05 · 2 answers · asked by ginahbaym 1

a. radioactive
b. quickly bound to a neighboring nucleus
c. free to wander about the nucleus
d. electrostatically repelled

2006-11-27 03:09:56 · 4 answers · asked by wgos1955 1

What is the acceleration of a .4 kg ball from rest to 9 m/s during the .15 s in which her foot is in contact with the ball.

2006-11-27 02:55:55 · 3 answers · asked by this Mike guy 5

They have length and width but do they have depth?

2006-11-27 02:47:49 · 11 answers · asked by the professor 2

the initial and final points lie on the same horizontal line .the object is thrown to the ground and falls back to the ground.

2006-11-27 02:44:17 · 5 answers · asked by satish0811 1

2006-11-27 02:39:55 · 2 answers · asked by DOOM 2

2006-11-27 02:39:07 · 8 answers · asked by NB 2

2006-11-27 02:34:05 · 2 answers · asked by esanjay_raj 1

This is a case of inertia.In train,bus or cars we experience many forces due to inertia.It is a question based on inertia too.

2006-11-27 02:04:05 · 12 answers · asked by DOOM 2

2006-11-27 01:33:38 · 11 answers · asked by pragnya 1

does anyone know how light is absorbed or any resources that could help me find out this information?

2006-11-27 01:09:47 · 4 answers · asked by nik456 3

2006-11-27 01:07:05 · 2 answers · asked by Marjorie 2

2006-11-27 00:52:03 · 2 answers · asked by hari 1

2006-11-27 00:46:26 · 2 answers · asked by Anonymous