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October 1, 2014

Posts by Jess


Total # Posts: 832

physics essay question
If you fire a bullet through a block of wood, it will slow down as it passes through the block and emerge at less than its initial speed. If you shine light on a pane of glass, it will slow down as it travels through the glass, but reemerge at light speed. Explain. That is ...
June 11, 2007

Phsyics
Can someone give me some pointers on calculating the rest energy of a positron (a particle that has the same mass as an electron and equal but opposite charge) ? thanks The rest energy is equal to the mass times the speed of light squared.
May 24, 2007

math
2^(x^2 - 35)= 4^x How do I solve this? The x^2 is messing me up. So far I have: ln(2^(x^2-35))=ln(4^x) (x^2-35)ln 2= xln4 x^2ln 2 - 35ln2= xln4 x^2ln 2- xln4= 35ln2 x(xln2 - ln4)= 35ln2 I would have taken the log base 2 of each side, but ok, with what you have, ln4 is 2ln2. ...
May 24, 2007

algebra
How do I do this question: -6|7-x|< -30 So far I have that x=2, but I know that it's more than just 2. How do I denote/find that? first of all isolate the absolute value expression by dividing by -6, remembering that we have to reverse the inequality sign if we divide ...
May 17, 2007

chem
45.0 grams of water vapor is cooled from 150 to 101 degrees celsius. How much heat energy was lost? heat= mass*specificheatsteam*deltaTemp
April 13, 2007

Factors in math
what are factors they make no sense whats a GCF and whats the factors for 28 and 77 13 52 91 56 70 64 96 112 88 121 24 36 60 18 63
April 4, 2007

biology
are the people with diabetes I normally skinny? because their body is unable to produce insulin, they must turn to other sources of energy like stored fat? http://www.associatedcontent.com/article/11204/juvenile_diabetes_type_one_diabetes.html Read the above site. Bear in mind...
February 27, 2007

GOVERNMENT HELP
b. constitution says only the sates may do.
February 26, 2007

math
Let F1=(-6,0) ,F2=(6,0) A=(10,0)64 + and B=(-10,0) write an equation of the set of all points p(x,y) such that (PF1/pluse /PF2/=20. now i know the problem is the square root of (x+6)^2 +y^2 + the square root of (x - 6)^2 + y^2 = 20 and the anserew is x^2/100 + y^2/64=1. i am ...
February 25, 2007

science
what is the following answers for the definitions i dont understand; control, repetition, validity, reliability, accuracy, controlled variable, independent and dependent variable, hypothesis? We'll be happy to help you understand these definitions if you post the ...
February 21, 2007

eth 125
the official language movement, pp.24-244 of the text by researching biligualism in education and politics in the U.S. Find four to six credible web sites or articles that support, opporse, more present information about biligualism in education of polictics
February 15, 2007

Calculus
I am confused on how to solve this problem : $5000 is invested for 4 years at 7% per annum compound interest. a. what will the amount be at the end of this period? b. what is the expression for the value of the investment after n full years? c. the investment will exceed $10,...
February 15, 2007

Economics
Utilizing market demand and market supply curves for spaghetti, help me illustrate the effect on equilibrium price and quantity of spaghetti for: Increased worldwide demand for rice leads to an increase in the price of ride (which many see as an alt to spaghetti in preparing ...
February 11, 2007

Economics
Utilizing market demand and market supply curves for spaghetti, help me illustrate the effect on equilibrium price and quantity of spaghetti for: Increased worldwide demand for rice leads to an increase in the price of ride (which many see as an alt to spaghetti in preparing ...
February 11, 2007

AP Chem
I missed a lab in class a week ago and had to make it up just the other day. My teacher didn't have time to explain the lab to me, so he gave me a brief overview of the procedure. The objective of the lab was to calculate the specific heat of an unknown block of metal. The...
February 8, 2007

egypt mummification
im doing a cross word and book of the dead and pyramid text dont fit what should i do
February 8, 2007

pre-calc
Solve: cos(2x-180) - sin(x-90)=0 my work: cos2xcos180 + sin2xsin180= sinxcos90 - sin90cosx -cos2x - sin2x= cosx -cos^2x + sin^2x -2sinxcosx=cosx I'm stuck here. I tried subtracting cosx from both sides and making sin^2x into 1- cos^2x, but I still can't seem to solve ...
February 7, 2007

Pre-Calc
How do I solve this? My work has led me to a dead end. tan(45-x) + cot(45-x) =4 my work: (tan45 - tanx)/(1+ tan45tanx) + (cot45 - cotx)/(1 + cot45cotx) = 4 (1-tanx)/(1+tanx) + (1-cotx)/(1+cotx) = 4 Then I found a common denominator, giving me this: (2-2cotxtanx)/(1+cotx+tanx+...
February 7, 2007

Chem
Does my work here look right? 3. One mole of an ideal gas expands adiabatically into a vacuum. Calculate q, delta-e, w, and delta-H for the process. q= 0 [adiabatic] w= -Pext(V2-V1) w= 0 delta-e = w + q delta-e = 0 + 0 = 0 delta-h= delta-e + P(delta V) delta-h= 0 + 0 = 0 does ...
February 3, 2007

Chem/Physics
1. How much work is necessary to accelerate a bullet having a mass of 5.0 g to a velocity of 1000. m/sec? This was on a chemistry problem set of mine, and it seems like a very physics-oriented question [I have not taken physics.] Could someone point me in the right direction ...
February 3, 2007

Chem
A few classmates and I were arguing about a problem we had to do for homework. The problem states: Limestone, CaCO3, when subjected to a temperature of 900 degrees C in a kiln, decomposes to calcium oxide and carbon dioxide . How much heat is evolved/absorbed when one gram of ...
February 1, 2007

8th grade algebra
ten over eight = what over ten????? please help me!!!!!!!!!! 10 / 8 = x / 10 This means that 8 * x = 10 * 10 Solve for x.
February 1, 2007

cHEMISTRY
Strontium metal is responsible for the red color in fireworks. Fireworks manufacturers use strontium carbonate, which can be produced by combining strontium metal, graphite (C), and oxygen gas. The formation of one mole of SrCO3 releases 1.220 x 10^3 kJ of energy. a) Write the...
February 1, 2007

Maths
3x + 1 < -2 subtract one from each side, then divide both sides by three. first you need to look at each side of what ever your looking at and subtract 1 from each number then divide the numbers by 3 I have trouble with math all the time. so I was wondering if you could ...
November 9, 2006

math
suppose that the gas tank of a car holds 12 gallons and that the car uses 1/ 20 of a gallon per mile .let x be the nuber of miles the car has gone since the tank was filled? (1/20x)= 12 so now get x by itslef! (1/20x)/ (1/20)= 12/(1/20) x= 240! yeah I am good! that is good! ...
October 30, 2006

math
suppose that the gas tank of a car holds 12 gallons and that the car uses 1/ 20 of a gallon per mile .let x be the nuber of miles the car has gone since the tank was filled? (1/20x)= 12 so now get x by itslef! (1/20x)/ (1/20)= 12/(1/20) x= 240! yeah I am good! that is good! ...
October 30, 2006

math
97x+1/4=4 okay well minus 4 from 1/4 wich gives you?? 97x= 15/4 now get x by itself by dividing 97 by 15/4 wow! 1). Subtract 1/4 from both sides 97x+1/4-1/4=4-1/4 97x=31/4 (3.75) 2). Devide both sides by 97 97x/97=3.75/97 <-or 3.75 devided by 97 x=?
October 30, 2006

math
97x+14=4 First, subtract 14 from both sides. Then, let us know if you get stuck.
October 30, 2006

math
gasoline consumption problem suppose that the gas tank of a car holds 12 gallons and that the car uses 1/ 20 of a gallon per mile .let x be the nuber of miles the car has gone since the tank was filled? car holds 12 gallons 1/20 gallon/mile 12*20 = 240 miles possible what is ...
October 30, 2006

word unscramble
daes sldrp
September 28, 2006

KEYBOARDING
The main difference between block letter style and modified block letter style is/are the
August 1, 2006

Philosophy
G > (J > O) ~ ~ M v V ~ O * ~ ~ J ~ V > K / ~ G ~ (K * M) / V (L * A) > Z W v S ~(~ L * T) S > ~ (P > V) A / S = ~ W / Z v T Rules of replacment- DeMorgans Rule**
June 18, 2006

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