Science & Mathematics - 30 August 2007

i like to surf.

2007-08-30 00:30:41 · 8 answers · asked by surfer_ade_uk 2 in Weather

answer it immediately pls....

2007-08-30 00:25:04 · 3 answers · asked by Anonymous in Botany

as i get the information from internet,an unscientific test (using one wiper motor and a torque wrench) found that at 12 volts, on high speed, the motor has 13.5 pound-feet and on low speed, has 17.5 pound-feet of stall torque. why this happen while the current drains to the motor during no load for high speed is higher than low speed? (high speed no load current is 1.95A; low speed no-load current is 0.9A) the higher the current mean higher power input, but y the torque is less?

2007-08-30 00:18:06 · 3 answers · asked by seongjin85 1 in Engineering

2007-08-30 00:15:28 · 16 answers · asked by Harsh P 1 in Astronomy & Space

A ball with radius .060m and mass 1.00 kg is attached by a light rod .400m in length to a second ball with radius .080m and mass 4kg.

a.Where is the center of gravity of this system?
b.Suppose the rod is uniform and has a mass of 2kg. Where is the system's center of gravity now?

2007-08-30 00:15:06 · 2 answers · asked by physics maniac 2 in Physics

It was so weird, the room shook a bit for lik 2 seconds. I need to know if I was imagining it
Before you americans think i'm being pathetic, this never happens here!

2007-08-30 00:13:15 · 11 answers · asked by Faith 4 in Earth Sciences & Geology

2007-08-30 00:08:00 · 3 answers · asked by nottie_g 1 in Astronomy & Space

A flat grindstone of mass M=1000kg is mounted on a frictionless bearing so it can rotate freely about the vertical axis passing through its center. The grindstone has zero initial angular acceleration and has a radius of .5m. A string is tied around its periphery and is pulled with a constant force of 10N. Find...

a. Find the torque exerted by the string with respect to the center of the grindstone.
b. Find the angular acceleration.
c.Find how much string will have been unwound 10s after the force was initially applied.
d.Find the kinetic energy of the body.
e. Find the amount of power delivered during rotations.

2007-08-30 00:07:48 · 2 answers · asked by physics maniac 2 in Physics

2007-08-30 00:02:49 · 3 answers · asked by WALTER M 2 in Earth Sciences & Geology