Physics - April 2007

The escape velocity of a bullet from the surface of planet Y is 1727 m/s. Calculate the escape velocity from the surface of the planet X if the mass of planet X is 1.63 times that of Y, and its radius is 0.927 times the radius of Y (in m/s).

2007-04-06 16:13:32 · 2 answers · asked by skiracer88_00 1

2007-04-06 15:39:32 · 9 answers · asked by Zantetsu warrior 1

A gyroscope consists of a M=1.8 kg disk with a radius R=2cm mounted at the end of a light axle r=7cm. The gyro spins at f=50 rev/s. It is held horizontal at one end of its axle and precesses about its stand.

Helpful info:
Angular momentum of the disk about it's axle .113 kg*m^2/s

Torque about the point of support due to the weight of the gyro =1.23 Nm

The Question is: How long does it take the gyroscope to precess once around?

I know the precession rate is the torque divided by the component of angular momentum that is precessing. I cannot get the right answer. Please help!

2007-04-06 14:57:08 · 1 answers · asked by bte666 1

what other info is needed to convert one to the other.

2007-04-06 14:46:41 · 5 answers · asked by Hard Rocker 3

or tell me where i can find it

2007-04-06 14:29:33 · 1 answers · asked by shelly 3

2007-04-06 13:21:06 · 5 answers · asked by rolando e 1

-Must be only 120 FLAT wooden toothpicks or less
-Must use only Elmer's glue
-Must be 3 toothpicks high
-Must have a 2 toothpick by 2 toothpick base (minimum)
-MAY base tower on cardboard
-Must hold 10 lbs.

*Please do not tell me to use triangles, unless you can describe an efficient way to use them, again, DO NOT tell me to use triangles unless you can describe how*

So, any ideas? :D

2007-04-06 12:59:57 · 9 answers · asked by shaferthejail 2

while doing an experiment of magnetoresistance

2007-04-06 12:48:39 · 4 answers · asked by NI 1

A contains nothing, B contains a piece of resistance wire between the terminals and C has a working diode. I was thinking running current through them and see what happens to an attached light bulb but I don't know what results would be caused. Can someone please help me with this?(it is schoolwork)

2007-04-06 10:30:13 · 6 answers · asked by deadly_plague101 1

2007-04-06 09:58:49 · 5 answers · asked by Homeless in Phoenix 6

2007-04-06 09:46:08 · 14 answers · asked by Anonymous

2007-04-06 08:45:32 · 7 answers · asked by Jay L 1

2007-04-06 08:30:34 · 4 answers · asked by Iconoclast 2

Okay, say i jumped off the empire state building would i die on impact when i hit the groung...say i hit anypart of my body....or would you feel some pain at first then die....i saw this on one movie before and the gut moved a little bit then died..is this true?

2007-04-06 07:48:47 · 6 answers · asked by M R 1

i need too know

2007-04-06 07:47:50 · 4 answers · asked by Itachi_Uchiha_2006 1

2007-04-06 07:39:28 · 4 answers · asked by JASA34 1

This question has really been on my mind for sometime now and I have begun searching for ways to maximize its use. Please, serious answers only.

2007-04-06 07:16:26 · 7 answers · asked by The Salesman 2

I need some help trying to figure out how to find the escape velocity from a planet. If i have the radius of the planet, and the gravitational acceleration speed yet no masses of the planet or the object to be fired upwards, which equations should i be using to find the escape velocity ?
Thanks.

2007-04-06 07:02:12 · 4 answers · asked by Anonymous

I have been looking at a lot of diagrams of wind turbine blades. Wind turbine blades use both lift and drag to cause rotation. The diagrams show cross sections of blades and arrows to indicate wind direction. The blades in the diagram have a 'teardrop' cross section.

Whenever I have read about the aerofoil effect, aeroplanes wings are used to instantiate it. Aeroplane wings have a cross sectional shape that makes the air above them travel faster than the air below them. They are like an asymmetrical teardrop shape with one side more rounded than the other. According to bernouli's theorem, this should and does produce a lift effect.

Whenever I look at diagrams of the cross section of wind turbine blades, they don't appear to have this asymmetry. They do, however, appear to be pitched in relation to the airflow.

Can anyone explain to me how the aerofoil effect is produced in this instance?

2007-04-06 06:41:32 · 5 answers · asked by tuthutop 2

what happens to it?

2007-04-06 06:20:22 · 5 answers · asked by imfromtheloonybin 1

2007-04-06 06:07:03 · 5 answers · asked by Andrew R 1

2007-04-06 05:55:56 · 6 answers · asked by genius 1

I'm especially interested in the blades/sales or what ever you call them, and their aerodynamic properties

2007-04-06 05:46:56 · 6 answers · asked by tuthutop 2

physics

2007-04-06 05:40:04 · 4 answers · asked by Anonymous

A submarine is at an ocean depth of 190 m. Assume that the density of sea water is 1025 kg/m^3 and the atmospheric pressure is 101000 Pa.

The acceleration of gravity is 9.81 m/s^2.

Calculate the absolute pressure at this depth. Answer in units of Pa.

Calculate the magnitude of the force exerted by the water at this depth on a circular submarine window with a diameter of 28.4 cm. Answer in units of N.

2007-04-06 05:25:27 · 3 answers · asked by emz 1

The four tires of an automobile are inflated to a gauge pressure of 153000 Pa. Each tire has an area of 0.0221 m^2 in contact with the ground.

Determine the weight of the automobile. Answer in units of N.

2007-04-06 05:23:48 · 1 answers · asked by emz 1

just curious.

2007-04-06 04:52:49 · 6 answers · asked by Anonymous

or do they only exist when they are "observed" by something else that they exist?

2007-04-06 04:21:14 · 7 answers · asked by Lindsey H 5

Ok, I want ti be a epidemiologist and im older that 11 but younger than 14. So All I need is some websites to go to that wil help me accomplish my dream. Things like mysterys to solve prior to the human body, cuz they dont have that at my school.

2007-04-06 04:06:02 · 1 answers · asked by tweety 1

the noise of a vacuum cleaner drives me nuts, I think it really sucks. If we can send someone to the moon how come we can't make a silent one?

2007-04-06 03:26:20 · 1 answers · asked by tina k 3