Science & Mathematics - 8 December 2006

Three blocks are arranged in a stack on a frictionless horizontal surface. The bottom block has a mass of 37.0 kg. A block of mass 18.0 kg sits on top of it and a 14.0 kg block sits on top of the middle block. A downward vertical force of 170 N is applied to the top block. What is the magnitude of the normal force exerted by the bottom block on the middle block?

2006-12-08 16:01:08 · 2 answers · asked by Spirit of Vengeance 2 in Physics

For the reaction

CH2=CH2 + Br2



Which of the following statements are true ?



a) The product is CH2Br=CH2Br

b) This is an addition reaction

c) CH2=CH2 is an alkene

d) The product will contain only double bonds

THANK YOU FOR YOUR HELP WITH THIS ONE!!!!

2006-12-08 16:00:57 · 3 answers · asked by patternpile 1 in Chemistry

I'm quite confusing with indices..especially with this question..
x ^ 1/3=81x

(the sign ^ means to the power of)
hopefully ,all of you can help me..please

2006-12-08 16:00:34 · 3 answers · asked by claYlia a 1 in Mathematics

The following reaction


CCl3CH2COOH + NH2CH2CH3

produces water and what other product ?



a) CH3CH2CBr2CONHCH2CH3


b) CH3CCl2CONHCH2CH3


c) CBr3CH2CH2CONHCH2CH3


d) CCl3CH2CONHCH2CH3


e) CH3CBr2CONHCH2CH3


f) CH3CBr2CH2CONHCH2CH3

2006-12-08 15:59:34 · 3 answers · asked by patternpile 1 in Chemistry

2006-12-08 15:58:53 · 6 answers · asked by Anonymous in Chemistry

Oxidizing a primary alcohol in the presence of a strong oxidizing agent produces a ____________ acid


Enter a one word answer that fills in the blank

2006-12-08 15:58:27 · 2 answers · asked by patternpile 1 in Chemistry

2006-12-08 15:55:58 · 12 answers · asked by missiemoo 1 in Astronomy & Space

2006-12-08 15:55:45 · 4 answers · asked by Anonymous in Other - Science

A 75 kg shell is fired with an initial speed of 125 m/s at an angle 55 degrees above horizontal. Air resistance is negligible. At its highest point, the shell explodes into two fragments, one four times more massive than the other. The heavier fragment lands directly below the point of the explosion.
Problem 9.66

If the explosion exerts forces only in the horizontal direction, how far from the launch point does the lighter fragment land?

2006-12-08 15:54:47 · 2 answers · asked by MattS 1 in Physics

Function: f(x) = -2x - 5

Coordinates: ( __, 0) (0, __)

The second coordinate I had no problem finding, I simply plugged in the zero and ended up with the coordinate (0, -5).
I'm having trouble finding the coordinate for (__, 0).
Please use as much detail as possible so that I can understand fully, that way I can figure it out on my own next time :) Thanks in advance.

2006-12-08 15:53:16 · 5 answers · asked by glitteringfairywings 2 in Mathematics

in the fridge, room temperature or what.

2006-12-08 15:51:44 · 3 answers · asked by mffl915 2 in Chemistry

I totally blew off this entire first semester, and I'm trying to do perfect on my finals to avoid going to credit recovery classes.
I really need help on my final review.

2006-12-08 15:50:55 · 9 answers · asked by pink_kitties_and_rhinoplasty 2 in Mathematics

...i now there are heaps of moving plates forming them ect...but why are there so many there???

2006-12-08 15:50:14 · 5 answers · asked by sandra k 3 in Earth Sciences & Geology

2006-12-08 15:49:03 · 6 answers · asked by ThEA 1 in Engineering

2006-12-08 15:48:58 · 2 answers · asked by xu x 1 in Biology

2006-12-08 15:48:41 · 5 answers · asked by 2Quinn 2 in Chemistry

experiment would have been if Thomson's plum pudding model of the atom had been correct.

(the question's connected...sorry)

2006-12-08 15:47:42 · 3 answers · asked by 2Quinn 2 in Chemistry

Your 300mL cup of coffee is too hot to drink when served at 88.0. degrees Celsius.

What is the mass of an ice cube, taken from a -17.0 degrees Celsius freezer, that will cool your coffee to a pleasant 58.0 degrees C?

2006-12-08 15:45:54 · 2 answers · asked by MattS 1 in Chemistry

2006-12-08 15:45:25 · 7 answers · asked by 2Quinn 2 in Chemistry

Math homework!!!!! ugh I hate it! It's due Tuesday so you have lots of time to help grab a calculator and help me draw a diagram if e times x is multiplied by the 45th multiple of 6!! Ugh it's hard!

2006-12-08 15:44:54 · 2 answers · asked by Lisa B 1 in Mathematics

2006-12-08 15:44:31 · 2 answers · asked by 2Quinn 2 in Chemistry

of chlorine.After losing the electron,Na will have------------protons in its nucleus.

2006-12-08 15:41:57 · 4 answers · asked by lala haha gaga mama 2 in Biology

2006-12-08 15:41:37 · 3 answers · asked by Gc 1 in Mathematics

I've applied to be a paid volunteer at a local clinic. What can i expect? And most importantly: Is being a paid volunteer safe?

2006-12-08 15:39:29 · 5 answers · asked by veggiepark 3 in Medicine

a) alpha radiation consists of particles with a 4+ charge
b) beta radiation consists of high-speed electrons
c) gamma radiation would be deflected toward positive plates
d) all forms of radiation can penetrate a lead plate

2006-12-08 15:37:51 · 6 answers · asked by 2Quinn 2 in Chemistry

has their ever been any earthquakes in Florida if so when and weir

2006-12-08 15:35:08 · 3 answers · asked by jetrose2000 1 in Earth Sciences & Geology

2006-12-08 15:34:59 · 1 answers · asked by smita 1 in Engineering

2006-12-08 15:34:11 · 4 answers · asked by Anonymous in Geography

2006-12-08 15:32:16 · 5 answers · asked by Lily K 1 in Engineering

A tow truck is pulling a car out of a ditch by means of a steel cable (Y = 2.0 x 1011 N/m2) that is 8.93 m long and has a radius of 0.379 cm. When the car just begins to move, the tension in the cable is 801 N. How much has the cable stretched?

2006-12-08 15:30:47 · 2 answers · asked by ????????????????? 2 in Physics