Science & Mathematics - 27 October 2006

At a certain factory, 300 kg crates are dropped vertically from a packing machine onto a conveyor belt moving at 1.20 m/s. The coefficient of kinetic friction between the belt and each crate is 0.400. After a short time, slipping between the belt and the crate ceases, and the crate then moves along with the belt. For the period of time during which the crate is being brought to rest relative to the belt, calculate, for a coordinate system at rest in the factory, (a) the kinetic energy supplied to the crate, (b) the magnitude of the kinetic frictional force acting on the crate and (c) the energy supplied by the motor. (d) explain why answers (a) and (c) differ.

2006-10-27 08:10:23 · 2 answers · asked by afchica101 1 in Physics

why do we hiccup. what causes it and what does it do to our bodies?

2006-10-27 08:04:45 · 7 answers · asked by Anonymous in Medicine

What is line integral of conservative field?

2006-10-27 08:02:46 · 2 answers · asked by Ann T 1 in Mathematics

2006-10-27 08:02:38 · 2 answers · asked by ADS 1 in Physics

2006-10-27 08:00:15 · 13 answers · asked by izms 1 in Mathematics

2006-10-27 07:56:30 · 8 answers · asked by Anonymous in Chemistry

I would like to know if anyone knows what the most absorbant materials are, that will absorb many times their weight when used in water. Material or chemical- thanks!

2006-10-27 07:55:30 · 5 answers · asked by Damon 2 in Engineering

2006-10-27 07:54:13 · 5 answers · asked by Lizzy B 1 in Physics

What is the importance of microorganisms in the field of biotechnology ? How is biotechnolgy being used in this case ?

2006-10-27 07:53:20 · 2 answers · asked by Anonymous in Biology

A particle can slide along a track with elevated ends and a flat central part. The flat part has length L=40 cm. The curved portions of the track are frictionless, but for the flat part the coefficient of kinetic friction is µk = 0.20. The particle is released from rest at point A, which is at height h = L/2. How far from the left edge of the flat part does the particle finally stop?

The answer is 20 cm but I don't know how to get this answer! Please Help!

2006-10-27 07:53:03 · 3 answers · asked by afchica101 1 in Physics

2006-10-27 07:49:28 · 3 answers · asked by Anonymous in Medicine

2006-10-27 07:49:11 · 3 answers · asked by Diana K 1 in Medicine

2006-10-27 07:46:59 · 9 answers · asked by kimberly n 1 in Mathematics

Im too lazy to figure the math.

2006-10-27 07:46:33 · 16 answers · asked by Theandysullivan 3 in Mathematics

2006-10-27 07:44:36 · 4 answers · asked by Anonymous in Chemistry

2006-10-27 07:43:04 · 5 answers · asked by Crystaly s 1 in Chemistry

when the test is a 2 hour test and i finished it in a 1hour and half what is there to do in that half hour> i only have a pen My paper And may not talk and must wait till it is over, What can i do to make the time past.

2006-10-27 07:41:41 · 4 answers · asked by milion dollar man 3 in Mathematics

i've been told that va means watts when it comes to the step down tranformer. i presume that va means voltage amps but how does that mean watts?

tks

2006-10-27 07:41:01 · 6 answers · asked by bigdave 2 in Engineering

at a particular time, a tree casts a shadow 28m long on the ground. at the same time, a nearby vertical pole that is 3 feet tall casts a shadow 4 feet long. how tall is the tree

2006-10-27 07:40:49 · 9 answers · asked by mandi_albie14 1 in Mathematics

2006-10-27 07:38:42 · 5 answers · asked by Anonymous in Chemistry

at a particular time, a tree casts a shadow 28m long on the ground. at the same time, a nearby vertical pole that is 3m high casts a shadow 4 m long. how tall is the tree

2006-10-27 07:38:39 · 7 answers · asked by mandi_albie14 1 in Mathematics

2006-10-27 07:38:31 · 3 answers · asked by mehul_dan 1 in Engineering

Science and future .With the current growth rate of global warming we might not even get more than 200 years for our existence on earth.

2006-10-27 07:38:29 · 7 answers · asked by shdskh 1 in Earth Sciences & Geology

Is the reason for the space-race because the moon and mars surrface reflect from gold and jems?

2006-10-27 07:35:27 · 8 answers · asked by Peoples Oakland 1 in Astronomy & Space

2006-10-27 07:35:06 · 14 answers · asked by KEL971 2 in Biology

2006-10-27 07:35:01 · 21 answers · asked by 3D-Guy 1 in Astronomy & Space

2006-10-27 07:34:53 · 10 answers · asked by MIKE G 1 in Mathematics

Hello, I am student and I hope to get a PhD,I want help to write a research proposal about " Proteomics as diagnostic tool" to discover biomarkers for any type of cancers or other diseases

2006-10-27 07:33:40 · 2 answers · asked by ssmalqarni 1 in Medicine

2006-10-27 07:33:28 · 4 answers · asked by jomama1234 2 in Other - Science

What is the speed of sound?

2006-10-27 07:32:17 · 1 answers · asked by Anonymous in Physics