Saturday
February 13, 2016

# Posts by dan

Total # Posts: 1,074

US HISTORY
Where did Prohibition Strongly take place and what were the major developments
February 22, 2012

US HISTORY
How Does prohibition era affect today life
February 22, 2012

french
thank you
February 21, 2012

french
Please can you check the following, thankyou. je vais acheter tu vas acheter il/elle acheter nous allons acheter vous allez acheter ils/elles vont acheter je acheterai tu acheteras il/elle achetera nous acheterons vous acheterez ils/elles acheteront i have to do the same for ...
February 21, 2012

statistics
I don't know
February 18, 2012

physics
The car has a mass of 1200kg Calculate the kinetic of the car when it travels at a speed of 12 m/s.
February 16, 2012

math
In the 17th century, there were more than 800,000 inhabitants of Paris. At the time, it was believed that no one had more than 200,000 hairs on their head. Assuming these numbers are correct and that everyone has at least 1 hair on their head, show that there had to be two ...
February 10, 2012

physics
our objects are situated along the y axis as follows: a 1.94 kg object is at +3.27 m, a 2.76 kg object is at +2.18 m, a 2.78 kg object is at the origin, and a 3.99 kg object is at -0.360 m. Where is the center of gravity of this system?
February 6, 2012

physics
You pick up a board of length 2.60 m and mass 13.00 kg. To do this, you exert a force upward with your left hand a distance LL=0.754 m from the left end of the board and you need to exert a force with your right hand a distance LR=0.264 m from the left end of the board. Assume...
February 6, 2012

Chem
How much energy (heat) is required to convert 248 g of water from 0oC to 154oC? Assume that the water begins as a liquid, that the specific heat of water is 4.184 J/g.oC over the entire liquid range, that the specific heat of steam is 1.99 J/g.oC, and the heat of vaporization ...
February 4, 2012

math
i need to find the answer for 964837 x 465
January 25, 2012

stats
A final exam in Math 160 has a mean of 73 with standard deviation 7.73. Assume that a random sample of 24 students is selected and the test score of the sample is computed. Assuming the scores are normally distributed, what percentage of sample means are less than 69?
January 23, 2012

statistics
A researcher wishes to estimate the mean height of women aged between 60 and 65 in the US. She desires a margin of error of 0.2 inches. Past studies suggest that a population standard deviation deviation of 3.2 inches is reasonable. Estimate the minimum sample size needed to ...
January 23, 2012

physics
CHICKEN NUGGETS = GOLDEN TAR
January 14, 2012

physics
What is the pressure at the bottom of a river (12 m deep) if the air pressure over the river is 98.23 kPa? The density of the river water is 988 kg/m3.
December 15, 2011

physics
What is the pressure at the bottom of a river (12 m deep) if the air pressure over the river is 98.23 kPa? The density of the river water is 988 kg/m3.
December 15, 2011

Spanishanother question
5. También yo recibí/he recibido muchos regalos de mi familia.
December 15, 2011

Physics
v = u + a*t so t = (v-u)/a x = t (v+u)/2 substituting for t, x = (v+u)(v-u)/2a put in known values: 13 = (5)(-5)/2a a = -25/26 m/s^2 f = m*a u(k) * f(normal) = m*a u(k) *m*g = m*a u(k) = a/g u(k) = -25/26 /9.81 = 0.098 where u(k) = coefficient of friction for magnitude of ...
December 11, 2011

physics
One dimension. In Fig. 13-32, two point particles are fixed on an x axis separated by distance d. Particle A has mass mA and particle B has mass 4.00 mA. A third particle C, of mass 80.0 mA, is to be placed on the x axis and near particles A and B. In terms of distance d, at ...
December 6, 2011

physics
One dimension. In Fig. 13-32, two point particles are fixed on an x axis separated by distance d. Particle A has mass mA and particle B has mass 4.00 mA. A third particle C, of mass 80.0 mA, is to be placed on the x axis and near particles A and B. In terms of distance d, at ...
December 6, 2011

Physics
You have a 2.4 m high platform that is level on top. A spring launcher is located on the top so that it launches objects horizontally. You want to launch a 0.70 kg ball so that it hits at target on the ground 6.0 m away from the base. If the spring constant is 500 N/m, what ...
November 17, 2011

algebra
if the lengths of a triangle are y, y-1 and 7 what is the length of the longest side if the perimeter is 65
November 15, 2011

Physics
What is the angular momentum (in kg*m*m/s) of a 790 gram symmetrical rotating bar which is 2.85 m long and spinning at 245 rpm about the center of the bar?
November 14, 2011

organic chemistry
Could you use NaOH to separate acetylsalicylic acid (aspirin) and acetaminophen (Tylenol) by acid-base extraction?
November 13, 2011

spanish
I have to translate this to indirect style is this correct? Original:Pero cien años después, las personas negras todavía no son libres. Cien años después, la vida de las personas negras sigue todavía tristemente atenazada por los ...
November 7, 2011

Physics
A 72.0 kg skateboarder wants to just make it to the upper edge of a "quarter pipe", a track that is one-quarter of a circle with a radius of 4.65 m. What speed (in m/s) does he need at the bottom assuming that the local acceleration due to gravity is 9.80 m/s2?
November 2, 2011

n/a
Is it not possible to talk to tutors or students directly?
October 31, 2011

Math
company is considering offering child care for their employees. They wish to estimate the mean weekly child-care cost of their employees. A sample of 10 employees reveals the following amounts spent last week in dollars.
October 30, 2011

Physics
A 72.0 kg skateboarder wants to just make it to the upper edge of a "quarter pipe", a track that is one-quarter of a circle with a radius of 4.65 m. What speed (in m/s) does he need at the bottom assuming that the local acceleration due to gravity is 9.80 m/s2?
October 27, 2011

Physics, help with a similar problem I just posted
I posted a the same problem with different numbers a minute ago. The answer to the problem below (same as the other with different numbers) is 28 degrees. Maybe this will help to solve it? Thanks! A block is hung by a string from the inside roof of a van. When the van goes ...
October 19, 2011

physics
A block is hung by a string from the inside roof of a van. When the van goes straight ahead at a speed of 28.9 m/s, the block hangs vertically down. But when the van maintains this same speed around an unbanked curve (radius = 144 m), the block swings toward the outside of the...
October 19, 2011

Physics
A 9.60 g coin is placed 10.7 cm from the center of a turntable. The coin has a coefficient of static friction of 0.80 and a coefficient of kinetic friction of 0.60 with the turntable. The turntable's angular velocity slowly speeds up until the coin starts to slide off. ...
October 17, 2011

german
[german] Sie sind sehr hübsch. = [en] You (formal) are very beautiful.
October 17, 2011

physics
a runner run halfway around a circular track whose radius is 60 meters in 45 secs what is the average velocity? what is the average speed?
October 16, 2011

Physics
light travels at a constant speed of 3x10*11 cm/sec. how long does it take light to reach the earth a distance of 1.5x10*8 km. give the answers in seconds and minutes.
October 16, 2011

Chemistry
when testing for antimony, what reagent prevents tin from reacting with the H2S to form SnS2? What reagent is used to identify copper and explain its function.
October 16, 2011

Chemistry
thanks i wish they were in my book
October 16, 2011

informal Logic
correct, but something that can always be revised? But can't find the exact answer in text, urrrg!
October 16, 2011

physics
A thin 2kg box rests on a 6kg board 50cm long with 20cm hanging off the edge of a table. How far can the center of the box be from the end of the table before the board begins to tilt?
October 12, 2011

Physics
Compressed air is used to fire a 41.0 g ball vertically upward from a 1.0-m-tall tube. The air exerts an upward force of 3.7 N on the ball as long as it is in the tube. How high (in m) does the ball go above the top of the tube, assuming that the acceleration due to gravity is...
October 10, 2011

Algebra Question 1
business A=x business B=2x-20 business C=2x-20+2(2x-20)-200 x+2x-20+2(2x-20)-200=1035 x+2x-20+4x-40-200=1035 7x=1035+20+40+200 7x=1295 x=185 Bus. A pledged \$185 million Bus. B pledged 185x2=370-20=350 million Bus. C pledged 350x2=700-200=500million 185+350+500= \$1035 million
October 6, 2011

math
You round down and say 500*3 which is 1500 then go 600*3 which is 1800. The number is between 1500 and 1800.
October 5, 2011

Physics
No idea
October 2, 2011

Physics
A car is traveling at 95km/hr when it collides with a stone wall. The car comes to rest after the first 30 cm of the car is crushed.what was the average horizontal force acting on a 68.1 kg driver while the car came to rest? If 5 cardboard boxes each 1.25 m wide and filled ...
October 2, 2011

german
1. Paragraph about some event in the past and how I reflect on it - What do you want to write about? - What don't you know? 2. Wetter - vocabulary? 3. Jahreszeiten - Frühling, Sommer, Herbst und Winter? 4. Partizip - mit|machen - auf|passen - an|kommen - ein|fliegen...
October 2, 2011

trig
The captain of a ship at sea sights a lighthouse which is 120 feet tall. The captain measures the the angle of elevation to the top of the lighthouse to be 19 ^\circ. How far is the ship from the base of the lighthouse?
October 1, 2011

physics
In the figure below, m1 = 10.0 kg and m2 = 4.5 kg. The coefficient of static friction between m1 and the horizontal surface is 0.60, and the coefficient of kinetic friction is 0.30. m1 is on a table connected to m2 by a string that is on a pulley. m2 is hanging off the table ...
September 28, 2011

algebra
a purse contains 26 coins, some of which are dimes and the rest are nickels. Altogether, the coins are worth more than \$2.10. At least how many dimes are in the purse?
September 25, 2011

physics
A truck at rest at a stoplight accelerates uniformly with acceleration a = 9 meters/second2 for 6.8 seconds after the light turns green. What is the speed of the truck in meters/second after that time interval?
September 20, 2011

geometry
if B is the midpoint of AC=1/2AC
September 20, 2011

geometry
g is between f and h. fh=8x,fg=6x+7, and gh+28. find fh
September 15, 2011

algebra
simplify 8-(y-1)-(10-4y)
September 14, 2011

physics
A = 51.15 V= 638.8
September 14, 2011

physics
correct me if im wrong solve for a = 102 and v = 1249
September 14, 2011

physics
ok i get
September 14, 2011

physics
where did you get the 144
September 14, 2011

physics
a uniformly accelerating train passes a green light signal at25.0 km/hr it passes a second light 125m farther down the track 12.0s later what is the trains acceleration? what is the trains velocity at the second light?
September 14, 2011

physics
a uniformly accelerating train passes a green light signal atk mhr it passes a second light 125m farther down the track 0s later what is the trains acceleration? what is the trains velocity at the second light?
September 14, 2011

English Correction
2-orient 4- 5-discern
September 14, 2011

math
moving straight ahead pg 12 #3
September 11, 2011

math
moving straight ahead pg 12 #3
September 11, 2011

Calculus
Sketch the region enclosed by the given curves. Decide whether to integrate with respect to x or y. Then find the area of the region. 2y=3sqrtx , y=3 , 2y+2x=5
August 17, 2011

public health
Where did the practice of public health first originate? North america South America Asia is it North America?
August 8, 2011

English 12
Does anyone know what book will we be using for poems,short stories and literature in Grade 12?
July 23, 2011

chemistry
I understand how to do the steps. but the wording is different on this problem, that is what I don't understand?
July 13, 2011

chemistry
What is the percent yield for the reaction PCl3(g) + Cl2(g) --> PCl5(g) if 119.3 g of PCl5 are formed when 61.3 g of Cl2 react with excess PCl3? I don't understand how to set this up?
July 13, 2011

chemistry
iron(III) oxide reacts with carbon monoxide gas to form solid iron metal and carbon dioxide gas: Fe2O3 + 3 CO --> 2 Fe + 3 CO2 If you begin the reaction with 84.34 g of iron(III) oxide and 68.87 g of CO, which reactant will be in excess at the end of the reaction and how ...
July 12, 2011

Public health
monitoring of reports of communicable diseases in the community types: descriptive and analytic epidemiology is used to determine such
June 28, 2011

chemistry
How many grams of O2 are required to burn 46.0 grams of C5H12?
June 22, 2011

history
Describe how influential the Cold War has been on the world of today.
June 11, 2011

math
Block method: 8 teachers for 5 courses [#]*[#]*[#].... [8]*[7]*[6]*[5]*[4]= ?
June 7, 2011

Statistics
A bag of marbles has 5 Green, 4 Red, and 3 yellow marbles. Three marbles are randomly drawn from the bag, without replacement: What is the probability that at least one of the three marbles drawn are red? What is the probability that only one of the three marbles drawn is red...
June 7, 2011

Out of 42 kids in a class twice as many failed Ela as math,4 failed both. If 7 failed neither, find how many failed each subject. Please help and show work it would be great thanks i really need help thanks
June 6, 2011

Statistics
Under what circumstances does the sampling distribution of the proportion approximately follow the normal distribution?
June 3, 2011

Geometry
V of cube = side*side*side = 6*6*6 = 216 V of hemisphere = 1/2 of V of sphere = 4/3*pi*radius cubed = 1/2(4/3(pi 3cubed))= 1/2(4/3(pi 27)= 1/2(36pi)= [18pi meters] or [56.52 meters]
June 1, 2011

Science
Using the balanced equation for this reaction, calculate the volume of CO2 that should be produced by the decomposition of 2.21g of CuCO3•Cu(OH)2 at STP.
June 1, 2011

math
20+d+10 where d=30, 20+30+10=60minutes or 1 hour
June 1, 2011

Physical Science 2nd Semester
May 24, 2011

world issuse
I'm a 7 letter word u read daily,my 5th 6th and 7th letter increase each year,my 3rd n 4th letter are the same,my 3rd 2nd n 5th letter cover 75% of the world.
May 24, 2011

english
Thanx
May 23, 2011

english
Pls Re-arrange this word aidgact
May 23, 2011

english
Is incense a social problem and why ?
May 14, 2011

Algebra
what does the sigma notation look like for the sequence 1/4,-1/9,1/16,-1/25
May 12, 2011

math
If a a sheet of cardboard measures 9 feet by 6 feet and is made into a perfect cube, what would the length of each edge be?
May 9, 2011

math
If a a sheet of cardboard measures 9 feet by 6 feet and is made into a perfect cube, what would the length of each edge be?
May 9, 2011

Chemistry
Calculate the pH of a solution that is made by mixing 10.00 mL of 0.2500 M HCl with 35.00 mL of .1500 M HNO3 and diluting the mixture to a total volume of 100.00 mL
May 5, 2011

Science
I would recommend to check out a website called physmatixsolve They helped me with a tough question i got in my Physics homework, classical mechanics. The amazing thing is that they really sent me the solution in less than 24 hours, which is pretty neat.
April 25, 2011

Physics
A 395cm oscillator has a speed of 104.5cm/s when its displacement is 2.80cm and 74.5cm/s when its displacement is 6.60cm. What is the oscillator's maximum speed?
April 24, 2011

Physics
A 20 cm long, 180g rod is pivoted at one end. A 17g ball of clay is stuck on the other end. What is the period if the rod and clay swing as a pendulum?
April 24, 2011

spelling
future
April 20, 2011

Math
Kelly takes 6 laps and Angela takes 5 laps so they both meet at the starting point at 90 minuets...1 hour and 30 minuets.
April 20, 2011

Math
If angle x lies in quadrant 3 and cos(x)= -0.6 Find cos(3pi/2-x)
April 20, 2011

trig
angle x lies in quadrant 3 and cos(x)=-.6. Find cos(3pi/2-x)
April 19, 2011

A level english literature
I need to write an essay comparing estrangement and alienation in cat on a hot tin roof and awakening, I sort of know what to write but I'm struggling to get a good opening to my essay. Help!
April 19, 2011

Physics
Fresh snow is about one-tenth as dense as liquid water. How much latent heat is released in storm clouds per square kilometer of surface area by the freezing of water droplets if the storm deposits a 30-cm-deep layer of fresh snow? Q = LfM where the mass is the density of ...
April 14, 2011

Physics
PROJECTILE LAUNCHED FROM EARTH'S SURFACE? A projectile is shot straight up from the earth's surface at a speed of 1.20×10^4km/hr. How high does it go? (answer in km) Supposed to solve this using F=G(mm/2r)...?
April 12, 2011

Physics
Speed of Asteroids With the same Radius? Two spherical asteroids have the same radius R . Asteroid 1 has mass M and asteroid 2 has mass 2M. The two asteroids are released from rest with distance 10R between their centers. What is the speed of each asteroid just before they ...
April 12, 2011

Physics
Finding a Lunar lander's Thrust? A 6000kg lunar lander is in orbit 50km above the surface of the moon. It needs to move out to a 200km -high orbit in order to link up with the mother ship that will take the astronauts home. How much work must the thrusters do in joules?
April 12, 2011

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