Friday
December 9, 2016

Posts by matthew

Total # Posts: 662

very hard PHYSICS QUESTION
Consider a solid ball of mass m = 50g and is placed on a long flat slope that makes an angle of 30° to the horizontal. The ball was initially at rest and was then released such that it rolled down the slope without slipping. With a detailed explanation of your method ...
November 21, 2016

Physics
query=a stone of mass 30grams is placed in a measuring cylinder containing some water. the reading of the water level increases from 50cm cubic to 60cm cubic. what is the density of the stone?
November 10, 2016

Algebra
you are the manager of a firm that produces two products X and Y at zero cost. there are three types of consumers(1000 of each type) with the following valuations of the two products. consumer type Product X($) ProductY($) 1 90 60 2 70 140 3 40 160 What are your profits if you...
October 27, 2016

Science-physics
A bottle weighs 35g when empty,95g when filled with water and 119g when filled with an organic liquid. What is the capacity of the bottle: A-60cm cube B-84cm cube C-130cm cube D-154cm cube
October 26, 2016

Math
A submarine at -28 feet dives 40 feet. What is the submarine's elevation after the dive?
October 23, 2016

Chemistry
A sample of cobalt, A, with a mass of 5g is initially at 25 degrees Celsius. When this sample gains 6.70J of heat, the temperature rises to 27.9 degrees Celsius. Another sample of cobalt B with a mass of 7 g is initially at 25 degrees Celsius. If sample B gains 5 J of heat, ...
October 17, 2016

social studies
Mrs. Sue I need your help. Which statement BEST describes the power of government provided by the Articles of Confederation? A) The national government held most of the power. B) Congress enforced its power by taxing the states. C) The states had more power than the national ...
October 12, 2016

art
Its 1b 2 d 3 a just took the test 100% correct i promise
October 5, 2016

Math
All the odd numbers from 51 to 5001 are written. What is the total number of digits used?
October 4, 2016

math probability
Assume that every time you buy an item of the Hong Kong Disney series, you receive one of the four types of cards, each with a cartoon character Mickey, Minnie, Donald and Daisy with an equal probability. Over a period of time, you buy 6 items of the series. What is the ...
September 27, 2016

Algebra
A rock is thrown upward with a velocity of 21 meters per second from the top of a 48 meter high cliff, and it misses the cliff on the way back down. When will the rock be 7 meters from the water, below? Round your answer to two decimal places.
September 21, 2016

Health
I thick c
September 6, 2016

Math
Find the area of each triangle with the given dimensions Base=3 centimeter, height =3centimeter
June 28, 2016

Ecology
an endemic species is best defined as a species that
June 5, 2016

Physics
A charge of -5.02 μC is traveling at a speed of 8.86 × 106 m/s in a region of space where there is a magnetic field. The angle between the velocity of the charge and the field is 54.6o. A force of magnitude7.85 × 10-3 N acts on the charge. What is the ...
May 17, 2016

Chemistry
What is the molar mass of toluene if 0.85 g of toluene depresses the freezing point of 100 g of benzene by 0.47 degrees celsius? Kf= 5.12 C/m
May 6, 2016

math
A crowd of people is watching a live TV show in an auditorium. Section B of the auditorium has eight rows of seats. Each row has 10 seats. If 75 percent of Section B is occupied, how many people are seated in that section?
April 25, 2016

Chemistry
At 350 K, Kc = 0.142 for the reaction 2 BrCl(g) ⇀↽ Br2(g) + Cl2(g) An equilibrium mixture at this temperature contains equal concentrations of bromine and chlorine, 0.077 mol/L. What is the equilibrium concentration of BrCl?
April 23, 2016

Physics
Bob (80 kg) lands with a resultant GRF of 1200 N at an angle of 80 degrees from the horizontal. What was his vertical acceleration during landing? If his vertical velocity at initial contact of landing is 3.0 m/s, how much work is required to bring his body to a complete stop...
March 20, 2016

Physics
Bob (80 kg) lands with a resultant GRF of 1200 N at an angle of 80 degrees from the horizontal. Round answers to nearest whole number. What was his vertical acceleration during landing?
March 20, 2016

Functions, graphs
f(x)=(x+1)/(1+x^2) a) explain why the graph lies above the x axis on the interval x=0 and x=sqrt(3) b)write an expression using the indefinite integral that gives the area between the graph f and the x axis between the values x=0 and x=sqrt(3). c)use integration to find the ...
March 5, 2016

Maxima, Stationary Points
Thanks Reiny, Ive had a look on wolfram alpha and seen the solutions. My problem is I need to show it using Maxima but for some reason Maxima will not solve my equation 9x^6 + 28x^4 + 51x^2 - 88x - 10 = 0. So frustrating.
March 5, 2016

Math Algebra
Learning Center would like a possible net profit of $650,000 on its new resource manual it sells to schools. The fixed costs for producing the manual are $780,000 and the variable cost per package is $19.85. If the estimated unit sales are 1,250,000 units, what selling price ...
February 26, 2016

algebra
The formula will be A=P(1+r/n)^nt P stands for the initial amount invested, so P= 4000 R is the rate (.04), and N is the amount of times it is compounded per year (1). For example, saying "compounded quarterly" would make n=4. T is, of course, time (3). This makes ...
February 25, 2016

Physics
A spherical satellite has 12 identical monopropellant thrust chambers for attitude control with the following performance characteristics: thrust (each unit): 5 lbf; Is (steady state or more than 2 sec): 240 sec; Is (pulsing duration 20 msec): 150 sec; Is (pulsing duration 100...
February 19, 2016

Math question/help please!
Jacklynn draws two adjacent angles that form a right triangle. One angle measures 32°. What is the measure of the other angle?
February 16, 2016

Physics
(Someone please help me !! I don't understand this.) Two tiny conducting spheres are identical and carry charges of -27.3C and +61.0C. They are separated by a distance of 2.64 cm. (a) What is the magnitude of the force that each sphere experiences? (b) The spheres are ...
February 9, 2016

math
Chelsea has 10 yards of yarn. How many bows can be made if each bow uses 2/3 yard of yarn? Draw a diagram that represents the situation. How many 2/3 yard did he cut? Does he have any left over? How much? Write a division sentence to show the situation.
February 3, 2016

chem
The temperature of a 80.0 g sample of mate- rial increases from 15.0◦C to 42.0◦C when it absorbs 4.00 kJ of energy as heat. What is the specific heat of this material? Answer in units of J/g · K.
February 1, 2016

science
False
January 20, 2016

History,Business Studies,Maths Lit,Cat,English,Afrikaans
What can I study after Grade 12
December 30, 2015

English
I have to do a 10-minute speech based on this: Give an account of Britain’s colonial policies concerning Africa, Australia, India, and New Zealand in the 19th century. I have little to no prior knowledge of this, so I'm not really sure where to start, or what I can ...
December 10, 2015

Algebra
If x varies directly as y and x=9 when y=2 find x when y is 6
November 24, 2015

geography
Where did the Cold War take place?Please just be specific(answer in countries).
November 16, 2015

math
Least to greatest quart gallon liter pint cup deciliter
November 9, 2015

Programming
Create and test a Visual Basic application to allow teachers to enter student results. One dimension of the array will hold the results for up to 10 students. The other dimension will hold up to 5 subjects. Additionally a string based array will hold the names of the subjects...
October 28, 2015

ELA Reading
Lun is right
October 7, 2015

Norman
Algebra 2 The difference of two numbers is 4. Three times the smaller minus the larger is 10. Find the numbers.
September 30, 2015

science
What is the rarest element?
September 29, 2015

math
What is the hardest expression in the world?
September 28, 2015

math
What is 57 divided by 2.95
September 28, 2015

Math
A scuba diver dives to a depth to a of 50 feet, then rises 15 feet, sinks 12 feet, then rises 20 feet, whats the answer?
September 14, 2015

Math
Suppose that a wind is blowing in the direction S45°E at a speed of 50 km/h. A pilot is steering a plane in the direction N60°E at an airspeed (speed in still air) of 150 km/h. The true course, or track, of the plane is the direction of the resultant of the velocity ...
September 14, 2015

Algebra 1
Find the range of f(x)=-x+4 for the domain {-3,-2,-1,1} A) {7, 6, 5, 3} B) {7, 6, 5, 4} C) {-7,-6,-5,3} D) {-7,-6,-5,4}
June 30, 2015

governmnt
Congress convenues every two years on_____of every____ year.
May 8, 2015

Pre-calc
There exist constants a, b, c, and d such that(sin x)^7 = asin 7x + bsin 5x + csin 3x + dsin x for all angles x. Find d. I tried rewriting them in the exponential form, but it becomes ugly as there are many negative cosines and divisions of i. Help?
April 7, 2015

Physics
A skateboarder approaches the circular hill with a velocity of 8.0 m/s at point B. The angle formed between the lines that join point AO and BO is 20 degrees. a) what is her speed at the top of the hill(Point A) if she coasts up to this point? b) what min speed must she have ...
April 7, 2015

chemistry
why doesnt the radius ratio rule work for TlCl3??? the division would be the radius of the cation / radius of the anion. For Tl3+ and Cl-...88pm/181pm = .49 which would correspond to a 'zinc blende' crystal structure and not a CsCl type crystal as the rest of the ...
March 7, 2015

science
I would say it is 0 because work is the a function of Force and horizontal displacement.
March 7, 2015

Art 7
Number 3 is D and Number 7 is D
March 6, 2015

math
A cyclist covers his outward journey downhill at 24mph. His return journey, over exactly the same distance uphill, is covered at only 12mph. What is the cyclist's average speed over the entire journey?
March 5, 2015

Chemistry Help
How many moles of H2 and N2 can be formed by the decomposition of 0.250 mol of ammonia, NH3? Is it 0.250*3mol H2=0.75 0.25*1mol N2=0.25 Am I correct?
February 28, 2015

Chemistry Help
oh i got it... thank you so much
February 27, 2015

Chemistry Help
so i have to do 1/2*0.00759=0.003795 = 3.795 mL is the answer?
February 27, 2015

Chemistry Help
Ba(OH)2 is 1/2 How can you get 1/2 from.
February 27, 2015

Chemistry Help
I still have problem on how can you get mols Ba(OH)2 from. Can you explain please
February 27, 2015

Chemistry Help
How many milliliters of 0.534 M Ba(OH)2 solution are needed to completely neutralize 34.5 mL of 0.220 M HBr solution? The reaction is Ba(OH)2(aq) + 2HBr(aq) → BaBr2(aq) + 2H2O(l) I did 0.0345 * 0.220 = 0.00759 Moles of HCl =2*0.00759= 0.01518 0.01518*1000= 15.18 mL ...
February 27, 2015

Chemistry Need Help
Thanks both of your replied. I got it now :)
February 27, 2015

Chemistry Need Help
Sorry but I still don't understand your explaining. Can you explain more briefly please. Thanks.
February 27, 2015

Chemistry Need Help
Cl2 + F2 -> 2ClF
February 27, 2015

Chemistry Need Help
Given the chemical equation, Cl2 + F2 2ClF, how many moles of ClF are produced in the reaction, if 1.50 moles Cl2 are made to react with 1.75 moles F2 ? I got the answer 3.50 moles but it was wrong. Can anyone help me please.
February 27, 2015

Math
1 inch = 15 miles: Franklin to Washington is 45 Miles (3 inches) Franklin to Lincoln is 30 miles (2 inches) How much farther from Franklin is Washington than is Lincoln? I worked it out to be 7 1/2 miles but my teacher says I am wrong? She says the answer is either 11 - 17 - ...
February 25, 2015

science
two small spheres lie 1.5 meters apart and carry identical charges. How large is the charge on each if a sphere experiences a force of 2.0 N.
February 24, 2015

Math
47. For science class, Kyle needs to make a dilute solution of 12 ounces that is 30% vinegar. But he only has 20% vinegar 60^ vinegar. How many ounces of 20% vinegar should he use? A. 3 ounces B. 6 ounces C. 9 ounces D. 10 ounces
February 18, 2015

Math
In triangle ABC, the degree measure of angle A is 20 degree greater than the degree measure of angle B. Angle C is a right angle. What is the measure of angle B? Is it 70 degrees. 90-20=70
January 28, 2015

Calculus
Ohhhhhhhhh THANKS
January 12, 2015

Calculus
F(x) = 3/4x^4 –x^3 -3x^2 + 6x Determine the interval(s) where f(x) is increasing (if any) and the interval(s) where f(x) is decreasing (if any). How do I know where f(x) is increasing or decreasing?
January 12, 2015

sociology
What does "Social Space" mean when we talk about location
January 3, 2015

Sociology101
thx
January 2, 2015

Sociology101
I found out. She said APA
January 2, 2015

Sociology101
She did not tell us which writing style to use. I think MLA is the standard.
January 2, 2015

Sociology101
I have to write an essay for my Intro to Sociology class. Do I write it in MLA or APA style?
January 2, 2015

Simple math
oh, I feel you
December 4, 2014

Simple math
If Kristin buys gas at $2.69 per gallon, which includes all taxes, what percentage of the price is the state tax? What percentage is the federal tax The state tax is .8 and federal tax is .18. So would I multiply each by the total amount the gas cost?
December 4, 2014

math
Darion needs 20 pieces of string 3/8 inch in length .He cut a 4 7/8 inch piece of string into pieces that are 3/8 of a inch long each. How many more pieces of string does he need?
November 16, 2014

Operations with Fractions
Darion needs 20 pieces of string 3/8 inch in length. He cut a 4 7/8 inch piece of string into pieces that are 3/8 of an inch long each. How many more pieces of string of string does he need?
November 15, 2014

Is this correct
Anyone??
November 11, 2014

Is this correct
f(x)= 1/3x^5 + x^-2 + 3, then f'''(x) is.. I got f'''(x)= 20x^2-24x^-5
November 11, 2014

math
A florist had an equal number of red and yellow tulips. She sold 624 red tulips. Then she had 4 times as many yellow tulips as red tulips. How many tulips did she have at first. 624 X 5 ----- 3120
October 27, 2014

Physics
A 15 kg sled experiences an applied force of 5.5 N [north] and an opposing frictional force of 2.5 N [south]. If the sled starts from rest, what will be the velocity of the sled after 4.0 s?
October 26, 2014

Chemistry
What is the difference between Citric Acid C6H8O7 and H3C6H5O7? I am seeing both and don't know which is the right one. Is one a solution of citric acid? Thanks
September 29, 2014

P.E
Lun is right
September 8, 2014

algebra
18x+4y=-10 9x-7y=-23
September 4, 2014

math
Area of a rectangle = 221 m2; width = length = ? Should the answer be 13 or or 26
September 2, 2014

Physics
Two boys are pulling a box across a horizontal floor as shown in the figure below. vector F 1 = 50.0 N and vector F 2 = 100 N. (a) Find the resultant (or sum) force by the graphical method. (b) Find the resultant (or sum) force by the component method.
August 25, 2014

Trig
Use the given information to evaluate sin (a-b). Exact answers. No decimals. Sin a = -7/25, cot b = 8/15; neither a nor b are in quadrant III.
May 7, 2014

Math
How many roots does x to the 3rd power -2x to the 2nd power-13x-10=0 have
April 21, 2014

Educational Technology
Anonymous is wrong
April 16, 2014

Chemistry
Doing some homework, are my answers right? HCN= Polar HCOOH= Polar H2CCCH2= Nonpolar Out of the following elements: Na, H, and Au order them least to greatest in the following: Eletronegativity= Na is smallest, H is second, Au is largest Ionization Energy= Na is smallest, Au ...
April 3, 2014

Statistics
a) E(Y) = λ t = (1/16)(16) = 1 star P(X>=2) = 1 - P(X<2) = 1 - [e^-1 + (e^-1)(1)/1!] = 0.264 b) P(X≥1) = 1 - P(X=0) = 1 - e^-μ 0.95 = 1 - e^-μ e^-μ = 1 - 0.95 e^-μ = 0.05 ln(e^-μ) = ln(0.05) -μ = -3 μ = 3 Therefore (3)(16) = ...
February 20, 2014

Science
Right Answers: True A B C C B C D
February 3, 2014

chemistry
A chemist needs a HCl solution with a molarity of less than 0.400 M for an experiment. To find out if a sample of HCl solution can be used in the lab, the chemist performs a titration to neutralize 59.2 mL of the HCl with 45 mL of 0.400 M NaOH. Based on the results, will the ...
January 31, 2014

Science
Tnks
January 13, 2014

statistics
each backpack will be weighted using kilograms for most accurate measurement. using a scale, set each backpack on the scale and record its weight. ensure before weighing that the scale is zeroed out. a platform scale is the best kind for this experiment.
January 8, 2014

Stats
A random sample of size 100 is drawn from a population with a standard deviation of 10. If only 5% of the time a sample mean greater than 20 is obtained, the mean of the population is ______.
December 13, 2013

Math
Thank you for the answer now I understand. For the next question I made a mistake this is the question elli has two 8 and 1/2 pound bags of mints. She plans to put 1/12 pound at each place setting. Will she have enough mints? She has 256 guests I think that means 256 place ...
December 11, 2013

math
Ellis plans to hand out door prizes as the guest arrive she has 256 guests every 6th guest will receive a mug and for every 14 guests will receive a t shirt. Which guest will be the first to receive both mug and at shirt? Next question is elli has 8 and 1/2 pound bags of mints...
December 11, 2013

Math
Explain how to use a protractor to measure an angle.
December 3, 2013

Maths
A flat circular disc, of radius R, can be modelled as a thin disc of negligible thickness. It has a surface mass density function given by f(r,φ) = k(1 - r2/R2), where k is the surface density at the centre and r is the distance from the centre of the disc.Using area ...
October 28, 2013

Computer Programming using python
DO IT BY YOURSELF OR YOU WILL NOT LEARN! GOOD LUCK!
October 24, 2013

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