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July 30, 2016

Posts by gina

Total # Posts: 572

Math
What angle equal to 6/8 turn?
March 23, 2011

math
Can you explain a little more on equivalent fractions with common denominator 3/4, 2/3, 7/8 thank you verry much.
March 21, 2011

math
Find equivalent fractions with a common denominator and order from least to grestest 1/2, 4/9, 4/18
March 21, 2011

math
Equivalent fractions 1/2,6/10,9/27,4/16
March 15, 2011

chemistry
how do you find the Kc of a reaction?
March 11, 2011

chemistry
what is the pH if you mix 250ml of 3M HCl with 500ml of 1.5M CN-? i know that: HCl+CN- ---> HCN+Cl- 250ml converts to .75 moles and 500ml also converts to .75 moles when using the 3M and the 1.5M. Ka=X^2/m-x x/1000=.015/750 .02 CN- left. 2.5*10^5=x^2/(.02-x) 2.5*10^5(x^2/(....
March 11, 2011

chemistry
At 2010K, the equilibrium constant Kc is 4*10^-4 for the following: N2+O2-->2NO If the equilibrium concentration of N2 is .28M and O2 is .38M, what is the equilibrium concentration of NO? a)1.8*10^-9 b)2.1*10^-5 c)4.3*10^-5 d)6.5*10^-3
March 11, 2011

calculus
Under what conditions for f'(x) and f''(X) can a graph be " straight" wthout being horizontal?
March 8, 2011

Algebre II
23 more than t
March 7, 2011

Chemistry
Two rigid containers of equal volume hold hydrogen and argon gases respectively at the same temperature and pressure. Which of the following statements is(are) false ? A) The two containers hold an equal mass of gas. B) The two containers hold an equal number of gas particles...
February 18, 2011

physics??
Two newly discovered planets follow circular orbits around a star in a distant part of the galaxy. The orbital speeds of the planets are determined to be 41.3 km/s and 52.7 km/s. The slower planet's orbital period is 7.74 years. (a) What is the mass of the star? (b) What ...
February 15, 2011

PHYSICS CIRCULAR MOTION
In an automatic clothes drier, a hollow cylinder moves the clothes on a vertical circle (radius r = 0.364 m), as the drawing shows. The appliance is designed so that the clothes tumble gently as they dry. This means that when a piece of clothing reaches an angle of è ...
February 15, 2011

physics circular arc
A motorcycle is traveling up one side of a hill and down the other side. The crest of the hill is a circular arc with a radius of 68.0 m. Determine the maximum speed that the cycle can have while moving over the crest without losing contact with the road.
February 15, 2011

physics
A 850-kg race car can drive around an unbanked turn at a maximum speed of 61 m/s without slipping. The turn has a radius of 160 m. Air flowing over the car's wing exerts a downward-pointing force (called the downforce) of 11000 N on the car. (a) What is the coefficient of ...
February 15, 2011

Physics circular motion
The earth rotates once per day about an axis passing through the north and south poles, an axis that is perpendicular to the plane of the equator. Assuming the earth is a sphere with a radius of 6.38 x 106 m, determine the centripetal acceleration of a person situated (a) at ...
February 15, 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 27.8 m/s, the block hangs vertically down. But when the van maintains this same speed around an unbanked curve (radius = 196 m), the block swings toward the outside of the...
February 15, 2011

physics1
A 850-kg race car can drive around an unbanked turn at a maximum speed of 61 m/s without slipping. The turn has a radius of 160 m. Air flowing over the car's wing exerts a downward-pointing force (called the downforce) of 11000 N on the car. (a) What is the coefficient of ...
February 14, 2011

Physics AP
A block is hung by a string from the inside roof of a van. When the van goes straight ahead at a speed of 27.8 m/s, the block hangs vertically down. But when the van maintains this same speed around an unbanked curve (radius = 196 m), the block swings toward the outside of the...
February 14, 2011

physics??
The earth rotates once per day about an axis passing through the north and south poles, an axis that is perpendicular to the plane of the equator. Assuming the earth is a sphere with a radius of 6.38 x 106 m, determine the centripetal acceleration of a person situated (a) at ...
February 14, 2011

physics!
A centrifuge is a device in which a small container of material is rotated at a high speed on a circular path. Such a device is used in medical laboratories, for instance, to cause the more dense red blood cells to settle through the less dense blood serum and collect at the ...
February 14, 2011

physics (centripetal acceleration)
The second hand and the minute hand on one type of clock are the same length. Find the ratio (ac,second/ac,minute) of the centripetal accelerations of the tips of the second hand and the minute hand.
February 14, 2011

Chemistry
Reactions can be speeded by increasing the proportion of reactant molecules which collide with proper orientation. This can be accomplished by......... A)compressing the reactant mixture. B) heating the reactant mixture. C) addition of a catalyst. D) cooling the reactant ...
February 9, 2011

Chemistry
Reactions can be speeded by increasing the proportion of reactant molecules which collide with proper orientation. This can be accomplished by......... A)compressing the reactant mixture. B) heating the reactant mixture. C) addition of a catalyst. D) cooling the reactant ...
February 8, 2011

Chemistry
A student dissolves 2.57 grams of iodine [molar mass= 257]in 10.0 grams of carbon tetrachloride [kb = 5.03C/m]. The normal boiling point of carbon tetrachloride is approximately 77degreesC. What is the approximate boiling point of the solution above?
January 9, 2011

calculus
What single deposit today in an account paying 7% interest compounded continuously would yield $18500 in 10yr?
December 18, 2010

math
5,5,5,10,10,10,15,15,15,15,20
December 18, 2010

chem
Jen, I know 2.62g is NOT the answer. That is what I came up with as well but it is incorrect.
December 8, 2010

Chemistry
A 22.5 gram sample of ammonium carbonate contains ? mol of ammonium ions?
December 8, 2010

chemistry
Alkali metals react with water to form hydrogen gas and the hydroxide of the metal. When 3.55 grams of an alkali metal reacts with excess water, 1020ml of hydrogen gas, measured at STP, are evolved. What is the alkali metal?
December 6, 2010

chemistry uvu
12.75 g less than the theoretically predicted mass of 25.69 g, what is the percent yield of this reaction?
November 21, 2010

chemistry
According to the following reaction, how many grams of copper(II) chloride are necessary to form 0.984 moles silver chloride? silver nitrate (aq) + copper(II) chloride (s) silver chloride (s) + copper(II) nitrate (aq)
October 22, 2010

Physics
A solid ball of mass m and radius r rolls without slipping through a loop of radius R, as shown in the figure. From what height h should the ball be launched in order to make it through the loop without falling off the track? (Use any variable or symbol stated above along with...
October 22, 2010

Physics - Height of ball launch
A solid ball of mass m and radius r rolls without slipping through a loop of radius R, as shown in the figure. From what height h should the ball be launched in order to make it through the loop without falling off the track? (Use any variable or symbol stated above along with...
October 21, 2010

Physics
A uniform solid cylinder of mass M = 2 kg is rolling without slipping along a horizontal surface. The velocity of its center of mass is 27.6 m/s. Calculate its energy. I got 761.76 Joules but I think it's wrong.
October 21, 2010

5th grade
On Monday John ran 7–8 mile and frank ran 5–8 mile how much farther did John ran than frank ? Show me the work
October 15, 2010

Physics
At a county fair, a boy and two friends bring their teddy bears on the giant Ferris wheel. The wheel has a diameter of 14.0 m, the bottom of the wheel is 1.9 m above the ground and its rim is moving at a speed of 1.0 m/s. The boys are seated in positions 45° from each ...
October 14, 2010

Physics
A centrifuge in a medical laboratory rotates at an angular speed of 3500 rpm (revolutions per minute). When switched off, it rotates 70.0 times before coming to rest. Find the constant angular acceleration of the centrifuge. (Assume the initial direction of rotation is the ...
October 14, 2010

Physics
What is the centripetal acceleration of the Moon? The period of the Moon's orbit about the Earth is 27.3 days, measured with respect to the fixed stars. The radius of the Moon's orbit is RM = 3.85 · 108 m.
October 14, 2010

Physics
At a county fair, a boy takes his teddy bear on the giant Ferris wheel. Unfortunately, at the top of the ride, he accidentally drops his stuffed buddy. The wheel has a diameter of 14.6 m, the bottom of the wheel is 1.1 m above the ground and its rim is moving at a speed of 1.0...
October 14, 2010

Physics
Assuming that the Earth is spherical and recalling that latitudes range from 0° at the Equator to 90° N at the North Pole, how far apart, measured on the Earth's surface, are Copenhagen (55.67° N latitude), and Rome (41.90° N latitude)? The two cities lie ...
October 14, 2010

Physics
A man with a mass of 65 kg stands up in a 64-kg canoe of length 4.0 m floating on water. He walks from a point 0.75 m from the back of the canoe to a point 0.75 m from the front of the canoe. Assume negligible friction between the canoe and the water. How far does the canoe ...
October 14, 2010

algebra
How do I solve problems similar to: 2/3X - 1/2Y = 3
October 11, 2010

chemistry
The boiling point of water at 735mmHg is 99.073C. What mass of NaCl should be added to 3.11kg water to increase the boiling point to 100.000C. Kb for water = 0.510K kg mol-1.
October 11, 2010

math
you welcome :) glad i could help!
October 8, 2010

math
(6+6)/(6)*(6+6)=24
October 8, 2010

computers
i dont understand the formula for caluculating e^x in order to write the code(java)
October 8, 2010

computer science
I dont understand the formula :/ im writing in java
October 7, 2010

computer science
I dont understand the formula :/
October 7, 2010

computer science
Write an application that calculates the value of e^x by using the following formula:e^x=1+(x/1!)+(x^2/2!)+(x^3/3!)... Allow the user to enter the number of terms to calculate
October 7, 2010

stats
There are four major political parties in the country Treon. A public research group is interested in finding out whether there is any relationship between the party that is supported by a citizen of Treon and that citizen's socio-economic status. For the purposes of a ...
October 7, 2010

finance
cpu company currently pays a divdend of $2.50. dividends are expected to increase at the rate of $.25 per share for the next several years. determine the current rate of CPU's common stock to an investor who expects to be able to sell the stock for $35 per share after 3 ...
October 3, 2010

statistics
soo ive got the porpotion. Do i have to do anything with that or is that my answer???
September 29, 2010

statistics
on the table thingy... do i use 1.90 and 2??
September 29, 2010

statistics
but i cant find the proportion for a z-score of 1.98
September 29, 2010

statistics
The weights of individual nails produced by the 'Hammer 'n Nail' hardware company follow a normal distribution with the average nail weight being 5.1 grams and the standard deviation in nail weight being 1.6 grams. When a nail is produced it is discarded if it ...
September 29, 2010

Math
You are a share analyst for an investment firm and are investigating the return on shares in the Eastern Mining Corporation over the last four years. The return on Eastern Mining Corporation shares over the last four years is presented. Calculate the geometric mean rate of ...
September 28, 2010

Math
Supply the missing numbers. Round any decimal to the nearest thousandth and percent to the nearest tenth of a percent if necessary. fraction decimal percent 12percent
September 27, 2010

ghemistry
which indicator is more reliable in the titration of H3PO4 with NaOH using methyl orange and phenolphthalein as indicators
September 26, 2010

Physics
A small blimp is used for advertising purposes at a football game. It has a mass of 93.0 kg and is attached by a towrope to a truck on the ground. The towrope makes an angle of 53.3° downward from the horizontal, and the blimp hovers at a constant height of 20.7 m above ...
September 21, 2010

Physics
A horse draws a sled horizontally across a snow-covered field. The coefficient of friction between the sled and the snow is 0.195, and the mass of the sled, including the load, is 209.8 kg. If the horse moves the sled at a constant speed of 1.730 m/s, what is the power needed ...
September 21, 2010

Physics
A spring with a spring constant of 223.9 N/m is compressed by 0.220 m. Then a steel ball bearing of mass 0.0372 kg is put against the end of the spring, and the spring is released. What is the speed of the ball bearing right after it loses contact with the spring? (The ball ...
September 21, 2010

Physics
An ideal spring has the spring constant k = 464 N/m. Calculate the distance this spring must be stretched from its equilibrium position for 26 J of work to be done. 1
September 21, 2010

Physics
A particle of mass m is subjected to a force acting in the x-direction. Fx = (3.2 + 0.55x) N. Find the work done by the force as the particle moves from x = 0 to x = 4.5 m. 1
September 21, 2010

Physics
You push your couch a distance of 3.8 m across the living room floor with a horizontal force of 180.0 N. The force of friction is 136.0 N. What is the work done by you, by the friction force, by gravity, and by the net force? you 1 friction force 2 gravity 3 net force 4
September 21, 2010

Physics
Two baseballs are thrown off the top of a building that is 7.24 m high. Both are thrown with initial speed of 63.3 mph. Ball 1 is thrown horizontally, and ball 2 is thrown straight down. What is the difference in the speeds of the two balls when they touch the ground? (Neglect...
September 21, 2010

Physics
Two cars are moving. The first car has twice the mass of the second car but only half as much kinetic energy. When both cars increase their speed by 4.54 m/s, they then have the same kinetic energy. Calculate the original speeds of the two cars. first car 1 second car 2
September 21, 2010

maths
Yes, altitude change is what I am trying to find, sorry I didnt make that clearer earlier
September 20, 2010

maths
Yes, that's exactly i am looking for, sorry i didnt make that clear earlier
September 20, 2010

maths
hi how would you calculate altitude given airspeed, rate of descent and time? thank you!
September 20, 2010

Physics
The position of an object as a function of time is given as x = At3 + Bt2 + Ct + D. The constants are A = 3.2 m/s3, B = 1.8 m/s2, C = −4.2 m/s, and D = 7 m. At what time(s) is the object at rest?
September 10, 2010

Physics
A rabbit runs in a garden such that the x- and y-components of its displacement as function of times are given by x(t) = −0.44t2 − 6.0t + 73 and y(t)= 0.35t2 + 8.3t + 34. (Both x and y are in meters and t is in seconds.) (a) Calculate the rabbit's position (...
September 10, 2010

Physics
Some rental cars have a GPS unit installed, which allows the rental car company to check where you are at all times and thus also know your speed at any time. One of these rental cars is driven by an employee in the company's lot and, during the time interval from 0 to 10 ...
September 10, 2010

Physics
You serve a tennis ball from a height of 1.8 m above the ground. The ball leaves your racket with a speed of 19.4 m/s at an angle of 7.28° above the horizontal. The horizontal distance from the court's baseline to the net is 11.83 m, and the net is 1.07 m high. Neglect...
September 10, 2010

Physics
For a science fair competition, a group of high school students build a kicker-machine that can launch a golf ball from the origin with a velocity of 16.0 m/s and initial angle of 36.8° with respect to the horizontal. (a) Where will the golf ball fall back to the ground? (...
September 10, 2010

Physics
A golf ball is hit with an initial angle of 30.5° with respect to the horizontal and an initial velocity of 81.9 mph. It lands a distance of 86.8 m away from where it was hit. By how much did the effects of wind resistance, spin, and so forth reduce the range of the golf ...
September 10, 2010

accounting
What role might an accounting professional play in ethical corporate decision making? Should an accounting professional play a role even when he or she is not the final decision maker? Explain your answer.
September 9, 2010

mat115
A pack of 250 key blanks costs $23.50. What is the unit price? I know that this is .094 but I am having trouble with the remaining 2 parts. If each cut key costs a customer $1.75, and it takes 2 minutes for Darren to cut a key, how much does Darren make per hour? If Darren, as...
August 28, 2010

math
If a ball is dropped from from 288 ft above the ground, how long does it take to reach ground level?
August 26, 2010

math
A pack of 250 key blanks costs $23.50. What is the unit price? If each cut key costs a customer $1.75, and it takes 2 minutes for Darren to cut a key, how much does Darren make per hour? If Darren, as the business owner, pays himself $800 per week, how much profit (or loss) is...
August 26, 2010

Physics
A machine carries a 3.0 kg package from an initial position of di = (0.50 m) + (0.75 m) + (0.20 m) at t = 0 to a final position of df = (7.30 m) + (11.0 m) + (7.20 m) at t = 14 s. The constant force applied by the machine on the package is F = (2.00 N) + (4.00 N) + (6.00 N...
July 22, 2010

economics
how might these trade restrictions on imported goods affect the japanese economy
May 19, 2010

principles of management
memo to a superior indicating that person’s strengths as a manager. Include a tactful recommendation regarding one thing they could do differently to be even more effective as a manager.
May 17, 2010

environmental science
i would like to know what three consequences (one at each level: individual, community, and population) that may occur with each of these resources if these resources become limited.? The resources i came up with are water, food, shelter, resilinence, and humans. Ithink these ...
May 17, 2010

environmental science
yes i would love for some help on this.
May 17, 2010

college
List five resources you believe are needed for survival and discuss why they are needed for survival. If these resources become limited it may have an effect on the individual, community or population level. Discuss three consequences (one at each level: individual, community...
May 17, 2010

philosophy
Slippery Slope - Hitler and Saddam parallels "If you cannot recognize your enemy, you will not defeat him...."
May 11, 2010

economics
an accurate statement about the great depresson is
May 4, 2010

biology
Can someone please help me with the following question. Thanks! Skin color is not directly tied to race. All humans carry the same genes. Yet why do some races seem to have darker (or lighter) skin tones than others?
April 14, 2010

Physics
use: kmax = hf - e kmax = h ( f becomes : c over lambda)- e e = ( Evev * 1.6 *10exp -19)
April 13, 2010

1st grade
show 25 cents in several ways
April 8, 2010

African American History
Due to the long stretch of years of oppression and torture African Americans hae gone through in this country, they want reparation similarly to other groups including the Jews, Japanese, and the Native Americans. What solutions or strategies would you or could you provide to ...
April 8, 2010

physical science
What subdivisions make up the geologic time scale? What is the primary basis for differentiating the eras?
April 8, 2010

physics
Are fat fish more likely to have broad stripes than thin fish? 7. Answers: Yes No 8. Reasons: Some fat fish have broad stripes and some have narrow stripes. 3/7 of the fat fish have broad stripes. 12/28 are broad striped and 16/28 are narrow striped. 3/7 of the fat fish have ...
March 27, 2010

Science
Radioactive carbon-14 dating has determined that a fossil is 5.7 x 10 to the third power years old. What is the total amount of the original Carbon-14 still present in the fossil?
March 24, 2010

chemistry
need answer to the following: for each molecular compounds, write the name corresponding name or write chemical formula to: A)nitrogen pentasulfide B)diphosphorus pentasulfide C) AS2S3 D)PBr5
March 11, 2010

survey of accounting
The ______ interest rate is used to calculate the regular interest payments made to the bond holder.
March 8, 2010

7th grade math
1. 36/7= _ _ 2. -8-m>-19
March 5, 2010

math
8 * 10 to the fourth power in standard form
March 3, 2010

physics
A single conservative force acts on a 5.00 kg particle. The equation Fx = (2x + 4) N describes this force, where x is in meters. As the particle moves along the x axis from x = 1.40 m to x = 7.00 m, calculate the following.
February 23, 2010

Algebra 2
Find the LCD of 5/18x^2y^3,-3/24x^4y^5
February 23, 2010

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