Physics - February 2007

A 60 Kg bicycle rider stands on one pedal attached to horizontal 155 mm crank arm,the torque is transferred dierctly to a 505 mm dia wheel, Calculate tangential force that the wheel applies to the road

2007-02-15 06:51:50 · 1 answers · asked by dufferson 1

Product of the ages of 3 sons is 36 and oldest son has red hairs, what are the ages of my sons?

2007-02-15 06:46:17 · 7 answers · asked by K 1

a certain ball is thrown vertically into the air from ground level. At the instant that the ball is traveling upward at 15 m/sec, the ball is 10 meters above the ground. The initial speed of the ball was most nearly ( ? ) m/sec? please help!!!!

2007-02-15 06:46:08 · 5 answers · asked by flaca61680 1

?? boys answer only??

2007-02-15 06:42:51 · 3 answers · asked by Anonymous

2007-02-15 06:38:05 · 9 answers · asked by trlz71 1

You swing an 0.8366 kg mass held by a string in a horizontal circle of 0.6137 m radius making a turn every 2.1285 seconds. What is the centripetal force?

The answer is 4.473901428206534, but what formula do u use to get it, how do u do it?

2007-02-15 06:30:14 · 4 answers · asked by Paul S 2

Their masses and the sizes are the same, but materials
have different unknown densities.

2007-02-15 06:15:34 · 5 answers · asked by Alexander 6

Find the speed of the block when the compression of the spring is 15.0 cm.

2007-02-15 06:13:05 · 2 answers · asked by Anonymous

The audible frequency range of human ear is 30 to 3000 Hz. But the 50 Hz alternating current which is for domestic use is not audible. why?

2007-02-15 05:59:24 · 6 answers · asked by Supratik P 1

i need it quick

2007-02-15 05:52:40 · 8 answers · asked by issy r 1

A rock is thrown straight upward with an initial velocity of 9.6 m/s in a location where the acceleration due to gravity has a magnitude of 9.81 m/s^2. To what height does it rise?

2007-02-15 05:48:26 · 4 answers · asked by Anonymous

A physics Q. Why is it that time remains a constant unit as in seconds, minutes, hours, days, and etc, yet on the indivdual, experiential level one experiences a speeding up effect or quickening as one passes through this phenomenon?

2007-02-15 05:44:22 · 5 answers · asked by star_star1972 2

2007-02-15 05:35:28 · 6 answers · asked by anthony b 1

My question is multi-part.

1. When you cut a metal rope, what actually happens at an atomic or molecular level? Does the knife slide between molecules or atoms or something? What give a metal it's particular strength, is it due to the density of the material or mass or something else?

2nd part
Assumptions:
1. Ignore the material the knife is made out of. It is the same for both plans.
2. The same exact amount of force is being applied in plan 1 as in plan 2.

Compare 1 & 2

Plan 1: When you cut a metal cord on the ground with a sharp knife, there is a certian physics involved. You are pressing the knife against the metal cord and against a rock or something. It takes a certain amount of force to cut that rope.

Plan 2: What about if the rope is tied between 2 trees. If you apply the exact same amount of force to cut the rope in that scenario is it easier to cut the metal rope? If so, why. Is it because the bonds of the atoms are being weakend or something. If not, why.

2007-02-15 05:28:56 · 2 answers · asked by Jedi K 1

I need to know it as inches of pressure...............2lbs of natural gas

2007-02-15 05:26:29 · 1 answers · asked by japanlover1977 2

A cat can hear sound frequencies up to 70,000 Hz. Bats send and receive ultra-high frequency squeaks up to 120,000 Hz. Which animal hears sounds of shorter wavelengths, cats or bats?

2007-02-15 05:21:11 · 3 answers · asked by cjosurf 2

Einstien relativity says that speed of light is a constant c in all frames.
But we know that light under goes diffraction when traveling thru some meduim, eg water, so then light travels slower!
Also in the Bose-Einstein condensate light has been slowed down to 38miles per hour !

So what did einstien really mean by saying speed of light is constant???

2007-02-15 05:04:10 · 8 answers · asked by sh 1

like when you stick your arm out of a car window

2007-02-15 04:53:47 · 5 answers · asked by Anonymous

2007-02-15 04:51:53 · 2 answers · asked by wencar29 1

i ve read somewhere that einstein has said that someday Buddhism will the worldwide religion and all other religions will be disproved!

Please tell me where i can read more about this idea?

2007-02-15 04:37:26 · 4 answers · asked by sh 1

A person jumps from the roof of a house 3.9 m hight. When he strikes the ground below, he bends his knees so that his torso decelerates over an aproximate distance of 0.70 m. If the mas of his torso(excluding legs) is 42 kg, find a) his velocity just before his feet strike the ground, and b) the average force exerted on his torso by his legs during decceleration

2007-02-15 04:22:51 · 1 answers · asked by alanis118 1

If we suspend freely a magnetic needle by a thread, then it will align in the earth's north-south direction.i.e north pole of the magnetic needle is in north side of the earth and south pole of the magnetic needle is in the south side of the earth. But north-north or south-south poles will repel each other. Then why the magnetic needle aligns in this way? please send this answer to karnam_2007@yahoo.com

2007-02-15 04:13:08 · 11 answers · asked by karnam r 1

i am a biology student and this is my first semester taking physic.can anyone explain to me about this topic motion and force?so,I can do better in next physic experiment

2007-02-15 04:03:33 · 3 answers · asked by siti0012 1

2007-02-15 04:00:15 · 4 answers · asked by Anonymous

read this in a book

2007-02-15 03:55:51 · 7 answers · asked by ladyvol90 1

2007-02-15 03:55:15 · 3 answers · asked by Anonymous

So many people say, I want to lose five pounds, but between daily weight fluctuations and uncertainty of bathroom scales is it even possible to know your weight to within 5 pounds of accuracy?

2007-02-15 03:47:16 · 3 answers · asked by abcdefghijk 4

2007-02-15 03:46:19 · 10 answers · asked by Anonymous

suppose a straight 1.00mm-diameter copper wire could just float horizontally in air because of the force due to the Earths magnetic field B, which is horizontal, perpendicular to the wire, and of magnitude 5.0*10^-5T. What current would the wire carry? Does the answer seem feasible? Explain please because this doesnt make sense!!

2007-02-15 03:14:16 · 3 answers · asked by Anonymous

I am a keen experimenter in electronics. I experimented a AM Transmitter circuit. I kept a radio tuned to the particular frequency near the circuit in an attempt to catch the signal. When I switched on the circuit, the radio made a "crack" sound. Same thing when it is switched off. So, I thought this was the signal coming in. But same thing happened another time. This time I kept the aerial of the radio near the switch of my study-lamp. Each time the lamp was turned on/off, the radio made the sound. Why is this happening? I also found that same phenomenon happened when the aerial of a AM Radio kept near the switch of any circuit. Please help...

2007-02-15 03:07:08 · 4 answers · asked by Allwin 2