Saturday
April 30, 2016

# Posts by jc

Total # Posts: 137

Math
It's 4x+4
November 8, 2015

chemistry
how much oxygen gas wil be produce from the decomosition of 50 grams of pottasium chlorate
October 12, 2015

Physics ( Thickness of a Spherical Shell)
Aluminum floater: A spherical shell with an outer radius R=2 cm is made of aluminum (mass density of Al is 2.7 g/cm3). How thick is the shell if the average density of the spherical object is exactly 0.5 g/cm3 ? Assume there is a vacuum in the hollow interior of the shell. ...
September 9, 2015

math
We fire a missile from ground level at 1750 ft/sec. at launch angle of 10 degrees. h(t) =-16t^2 + vot +h a. find a function for height as a function b. find a function for distance from launch point as a function of time. c. when will the missile reach max height? d. What is ...
June 21, 2015

chemistry
The boiling point of diethyl ether, CH3CH2OCH2CH3, is 34.500 °C at 1 atmosphere. Kb(diethyl ether) = 2.02 °C/m In a laboratory experiment, students synthesized a new compound and found that when 13.85 grams of the compound were dissolved in 283.2 grams of diethyl ether...
May 14, 2015

MATH
The shop sold 264 inflatable rafts in 24 days. What was the average number of rafts sold each day?
January 11, 2015

MATH
The shop sold 264 inflatable rafts in 24 days. What was the average number of rafts sold each day?
January 11, 2015

World history
what freedoms were the people of Napoleon's day willing to sacrifice
December 29, 2014

I think it has something to do with proportion
October 20, 2014

physics
450.4 m/s
September 20, 2014

algebra
I having serious problems trying to solve this equation please help me find the product matrix for this input-output and demand matrices A= [ 0.1 0.03] D= [5] [ 0.07 0.6] [10]
April 26, 2014

chemistry
A 7.00 g sample of KCl is dissolved in 81.0 mL of water. The resulting solution is then added to 28.0 mL of a 0.790 M CaCl2(aq) solution. Assuming that the volumes are additive, calculate the concentrations of each ion present in the final solution.
March 5, 2014

algerbra
how do i solve with substitution?
December 12, 2013

algerbra
3x-2y=8 2x=2y=22 How i solve with substitution?
December 12, 2013

algebra
-3x-5y=-6 6x+5y=-34 how do i solve this using elimination?
December 12, 2013

chemistry
Buttermilk has 9 grams of protein and 12 grams of carbohydrate per cup (237ml). Estimate the concentration in mol/L of protein using the fact that the average protein is 300 amino acids long and the average amino acid has a mass of 110 amu
October 14, 2013

IWU
You are considering buying 27 silver coins that look alike, but you have been told that one of the coins is a lightweight counterfeit. Find the least number of weighings on a balance scale that you can use to be certain you have found the counterfeit coin. Can you explain the ...
September 24, 2013

Determine the Interval notation and Inequality notation of the absolute value notation: abs(x)>-5
February 19, 2013

Solve: 12+4|6x−1|<4 5−6|x+7|less than or equal to 17 ...can you please explain to me.. i know that it's like solving algebraically but one of them has no solution..
February 16, 2013

MHF4U
Solve: 12+4|6x−1|<4 5−6|x+7|less than or equal to 17 ...can you please explain to me.. i know that it's like solving algebraically but one of them has no solution..
February 16, 2013

College Math
I guess that the number of men and women doesn't matter so they're just 35 all. My answer is 35P4 + 31C6. . I used permutations for the pres~sec b'cse they have diff roles, not like the advisory committee. . Email me at ust008332@gmail if you found a better answer.
August 25, 2012

home economics
As part of the nation’s recovery from the Great Depression of the 1930s, the banking system was reformed in which of the following ways? A. The government paid off loans for large corporations. B. The Federal Reserve Banks were closed. C. Banks were deregulated by the ...
August 22, 2012

Math
Calculate the monthly finance charge for the following credit card transaction. Assume that it takes 10 days for a payment to be received and recorded and that the month is 30 days long. Assume 365 days in a year. (Round your answer to the nearest cent.) \$3,000 balance, 21% ...
August 5, 2012

Geometry
The base of the prism is a rectangle with sides 13 m and 5 m in length. Find the lateral surface and surface area of the given prism.
May 5, 2012

Anthropology
Ethnographic methods are to ethnological methods as: (Points : 1) the humanities are to the sciences. fieldwork is to laboratory experiments. description is to comparison. nature is to culture.
April 1, 2012

Physics
the charges an coodinates of two points charges located in x-y palne are : q1=+3*10^-6 C ; x=+3.5 cm . y=+0,5 cm and q2=-4*10^ -6 C; x= - 2 cm y=+1.5 cm . (a)Find the electric potential at the origin(b)How much work must be done to locate these charges at their given positions...
February 22, 2012

Physics
Consider a point charge with q= 1.5*10^-8 C. (a) what is the radius of an equpotential surface having a potential of 30 V?(b)Are surfaces whose potential differ by a constant amount (1,0 V) evenly spaced in radius?
February 22, 2012

Physics
A thin condicting spherical shell of outer radius 20cm carries a charge of +3 muC. Sketch (a) magnitude of the electric field E and (b) potential V versus the distance r from the center of the shell.
February 22, 2012

Physics
a small sphere whose m mass is 1.0 mg carries a charge q of 2.0*10^(-8)C. It hangs from a silk thread that makes an angle of 30 degrees with a large charged nonconducting sheet as in figure. Calculate the uniform charge density σ for the sheet
February 22, 2012

criminal law
•Should the United States combine all the police agencies into one national police organization? Why or why not? •If you must consolidate the police, would you have to do the same to the criminal justice system? How would you create and establish such a police ...
February 19, 2012

mats
Factorise into prime factors: 2m^20-1/8
February 15, 2012

Physics4
2. At the point of fission, a nucleus of 235U that has 92 protons is divided into two smaller spheres, each of which has 46 protons and a radius of 5.9 × 10^-15 m. What is the magnitude of the repulsive force pushing these two spheres apart? The value of the Coulomb ...
February 12, 2012

Physics3
Two charged particles of equal magnitude (+Q and +Q) are ﬁxed at opposite corners of a square that lies in a plane (see ﬁgure below). A test charge −q is placed at a third corner. If F is the magnitude of the force on the test charge due to only one of the ...
February 12, 2012

Physics2
A particle of mass 47 g and charge 54 C is released from rest when it is 13 cm from a second particle of charge −15 C. Determine the magnitude of the initial acceleration of the 47 g particle. Answer in units of m/s2
February 12, 2012

Physics1
Four point charges are placed at the four corners of a square. Each side of the square has a length L. Find the magnitude of the electric force onq2 due to all three charges q1, q3 and q4 for L = 1 m and all q = 1.55 C. Answer in units of N
February 12, 2012

electrostatic physics
drwls, all four q is 1.55C
February 12, 2012

electrostatic physics
Four point charges are placed at the four corners of a square. Each side of the square has a length L. Find the magnitude of the electric force on q2 due to all three charges q1, q3 and q4 for L = 1 m and q = 1.55 C. Answer in units of N
February 12, 2012

electrostatic physics
A particle of mass 47 g and charge 54 C is released from rest when it is 13 cm from a second particle of charge −15 C. Determine the magnitude of the initial acceleration of the 47 g particle. Answer in units of m/s2
February 12, 2012

electrostatic physics
I thought it was 8 but im wrong
February 12, 2012

electrostatic physics
Two charged particles of equal magnitude (+Q and +Q) are ﬁxed at opposite corners of a square that lies in a plane (see ﬁgure below). A test charge −q is placed at a third corner. If F is the magnitude of the force on the test charge due to only one of the ...
February 12, 2012

electrostatic physics
An uncharged molecule of DNA (deoxyribonucleic acid) is 2.15 m long. The ends of the molecule become singly ionized so that there is a charge of −1.6 × 10^−19C on one end and +1.6 × 10^−19C on the other. The helical molecule acts like a ...
February 12, 2012

electrostatic physics
2. At the point of fission, a nucleus of 235U that has 92 protons is divided into two smaller spheres, each of which has 46 protons and a radius of 5.9 × 10^-15 m. What is the magnitude of the repulsive force pushing these two spheres apart? The value of the Coulomb ...
February 12, 2012

trig
a tree growing on a hillside casts a 102-foot shadow straight down the hill. Find the vertical height of the tree if, relative to the horizontal, the hill slopes 15.0 degrees and the angle of elevation of the sun is 62.0 degrees.
November 8, 2011

Physics
A lawn mower has a flat, rod-shaped steel blade that rotates about its center. The mass of the blade is 0.65kg and its length is 0.55m. What is the rotational energy of the blade at its operating angular speed of 3450 rpm? If all of the rotational kinetic energy of the blade ...
October 23, 2011

Physics
A wheel of radius R starts from rest and accelerates with a constant angular acceleration alpha about a fixed axis. At what time t, will the centripetal and tangential accelerations of a point on the rim have the same magnitude?
October 23, 2011

Physics
A centrifuge is a common laboratory instrument that separates components of differing densities in solution. This is accomplished by spinning a sample around in a circle with a large angular speed. Suppose that after a centrifuge in a medical laboratory is turned off, it ...
October 23, 2011

Grammar
Thanks! (:
October 18, 2011

Grammar
In the sentence "Let's walk around." Walk is the noun or the verb? And What is "Let's"?
October 18, 2011

Math %
Please advise how do I get the Regular % and the Cummulative % I just need one example other wise I will lose what's left of my mind. Defect Description Qty Improperly Sized 258 Bad Seam 153 Missing Buttons 67 Fabric Flaw 22 Total 500
September 18, 2011

Statistics
Please advise how do I get the Regular % and the Cummulative % I just need one example other wise I will lose what's left of my mind. Defect Description Qty Improperly Sized 258 Bad Seam 153 Missing Buttons 67 Fabric Flaw 22 500
September 18, 2011

Please confirm if I did this correctly: What is the Principal? Principal \$21250 X 10% 2,125 What is the total amount paid by the consumer? 2,125 x 3.5 years 7,437.5 +21,250.0 28,687.50
June 4, 2011

chemistry
how would you make one gram potassium chloride with barium chloride and potassium carbonate
May 5, 2011

chemistry
how would you make one gram potassium chloride with barium chloride and potassium carbonate
May 5, 2011

college math
Find the distance of the shotcut and the distance of the long way for two locations. find the number of seconds saved ( 2.1 and 5.8) Approximate the are of the affected region (24 and 248 Sq Ft). find the average amount of oxgen saved per second saved (10.8 and 110.6 KG of ...
March 1, 2011

college physics
A diver runs horizontally with a speed of 0.759 m/s off a platform that is 10.0 m above the water. What is his speed just before striking the water?
February 23, 2011

physics
An airplane with a speed of 94.9 m/s is climbing upward at an angle of 63.2 ° with respect to the horizontal. When the plane's altitude is 743 m, the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly beneath the point...
February 23, 2011

college physics
loft the ball with an initial speed of 15.0 m/s at an angle of 50.0° the horizontal. At this instant your opponent is 10.0 m away from the ball. He begins moving away from you 0.38 s later, hoping to reach the ball and hit it back at the moment that it is 2.10 m above its...
February 23, 2011

college physic
a rifle that has been ‘sighted in' for a 91.4-meter target. If the muzzle speed of the bullet is v0 = 328 m/s, there are the two possible angles è1 and è2 between the rifle barrel and the horizontal such that the bullet will hit the target. One of these ...
February 23, 2011

college physics
An airplane is flying with a velocity of 240 m/s at an angle of 30.0° with the horizontal, as the drawing shows. When the altitude of the plane is 2.4 km, a flare is released from the plane. The flare hits the target on the ground. What is the angle è?
February 23, 2011

Chemistry
For the weak acid HX, what is the pH of a 0.10 M solution if the acid is 4.0% ionized?
February 21, 2011

chemistry
Calculate the pH in a 0.00500 solution of NaOH.
February 21, 2011

Maths
how do you factorise 2x-y-ysqaured? thanks
February 20, 2011

Math
If your neighbor's house is 2/8 smaller than you house and the volume dimensions of your house are 13, 26 and 130 sq ft, what is the volume of your neighbor's house
January 19, 2011

physics
a 150 grain .30-06 bullet has a mass of 0.01 kg and a muzzle velocity of 900 m/s. If it takes 1 ms(millisecond) to travel down the barrel, what is the average force acting on the bullet?
December 1, 2010

Stastics
no, you have to use a t value. you did the problem wrong.
November 28, 2010

physics
The water skier in the figure is at an angle of 35degree with respect to the center line of the boat, and is being pulled at a constant speed of 15m/s . 1)If the tension in the tow rope is 90.0N, how much work does the rope do on the skier in 30.0s ? 2)How much work does the ...
November 20, 2010

physics
The water skier in the figure is at an angle of 35degree with respect to the center line of the boat, and is being pulled at a constant speed of 15m/s . 1)If the tension in the tow rope is 90.0 , how much work does the rope do on the skier in 30.0 ? 2)How much work does the ...
November 20, 2010

Physics
Given: 90m skid mark .50 coefficient of friction between the tires and skid mark How fast is the car moving when the brakes initially applied?
November 18, 2010

Physics
it says to use conservation of energy we know conservation of energy when not dealing with heat is u+k=u+k where u is the potential energy and k is you kinetic energy. potential energy is mass x gravity x height. kinetic energy is (1/2)(mass)(velocity)^2. from there you get ...
November 15, 2010

Physics
Vw+b = Vb x sqrt[Mb/(Mb+Mw)] I've derived it from 0.5xMbx(Vb^2) = 0.5x(Mb+w)x(Vw+b)^2
October 18, 2010

chemistry
part B. would you expect the emissions to vary if metal flourides were used rather than metal chlorides?
October 6, 2010

chem
why do different compound have different colours in their visible emissions?
October 6, 2010

physics
Vector A has a magnitude of 23 units and points in the positive y-direction. When vector B is added to A, the resultant vector A+B points in the negative y-direction with a magnitude of 15 units. Find the magnitude of B?
September 21, 2010

physics
An airplane flies 200 km due west from city A to city B and then 305 km in the direction of 30.0° north of west from city B to city C. (a) In straight-line distance, how far is city C from city A? ___km (b) Relative to city A, in what direction is city C? ___° north of...
September 21, 2010

Physics
A brick is thrown upward from the top of a building at an angle of 30° to the horizontal and with an initial speed of 11 m/s. If the brick is in flight for 3.2 s, how tall is the building? ___m
September 21, 2010

physics
A jet plane lands with a speed of 101 m/s and can accelerate at a maximum rate of -4.60 m/s2 as it comes to rest. (a) From the instant the plane touches the runway, what is the minimum time needed before it can come to rest? ___s b)What is the actual minimum distance needed to...
September 14, 2010

chemistry,math
One liter of approximetely 0.25N HNO3 has been prepared. Upon titration it was found that 5.0 ml of the acid required 11.0 ml of 0.10N NaOH for neutrality. How much concetrated HNO3 at 15.8N must be added to one liter to make it exactly 0.25N?
August 23, 2010

math,chemistry
How much water should be added to 1 liter of 0.12N HCl to prepare exactly 0.1N HCl?
August 23, 2010

math,science,lab
One liter of approximetely 0.25N HNO3 has been prepared. Upon titration it was found that 5.0 ml of the acid required 11.0 ml of 0.10N NaOH for neutrality. How much concetrated HNO3 at 15.8N must be added to one liter to make it exactly 0.25N?
August 23, 2010

statistics
a random sample of 100 college students is taken from the student body of a large university. assume that a population mean of 20 hours and a population standard deviation of 15 hours describes the weekly study estimates for the entire student body. About 68 percent of the ...
June 27, 2010

Society
are these countries that are growing in population though, urbanization? are these two the same city? Ho Chi Minh City (Saigon),
June 18, 2010

Society
What do you think a good third world city or a major city in a poor developing country would be a good one to write an urbanization report and trends on? I have to have a major city in the country? I just want advice if anyone knows what one would be good to research and write...
June 18, 2010

chemistry
What is the pH of the solution created by combining 12.90 mL of the 0.10 M NaOH with 8.00 mL of the 0.10 M HC2H3O2?
May 3, 2010

Is there hidden cost with pulley systems that reduce effort?
April 7, 2010

trig
b=a(tanB) where a is your altitude, B is your angle of depression and b is your distance to airport. b=30,000(tan(72)) b=92,330.51
March 10, 2010

physics
worked thanks...
December 6, 2009

physics
a 15-kilogram box is dragged up an incline that is 8.0 meters long and makes an angle of 15 degrees with the horizontal. If the coefficient of friction between the box and the incline is .40, calculate the amount of work done by the applied force.
December 6, 2009

Calculus
You forgot to include velocity. Using the equation distance= 1/2at^2+vt, one can plug in t (time) and distance.
November 25, 2009

algebra
5(2m+3)-(1-2m)=2[3(3+2m)-(3-m)] Does this have a solution? I can only get so far... Thanks
September 21, 2009

Biology
How do you figure out <when you have a certain # to work with in an atom > how do you come up with how many neutrons, electrons and protons in the atom from the nucleus? Please help
September 2, 2009

math
homework
April 3, 2009

health
what does it mean when you find a three digit code highlighted in the tabular list?
February 11, 2009

English
Is there any good websites which can give me something to read on "About a Boy" the novel. I have to write a supervised essay in class tomorrow about how the characters change and how they "lose or gain" something. I have a brief idea on the how I'm ...
November 12, 2008

Physics
Sorry for posting so many, but I just need to make sure I'm on the right track. Just need someone to check my working and answers. A rocket has a mass 3000kg. The fuel used in the rocket has an additonal mass of 500kg. At the launch, the rocket accelerates at 4m/s/s. Using...
November 6, 2008

Physics
Yay thanks
November 6, 2008

Physics
Well for the first one, if its at peak of it's flight, the speed would be zero. Would the answer be B because the gravity is always constant? and for the second one, would be answr be B then? I'm thinking that there are gravitational effects occur anywhere, like the ...
November 6, 2008

Physics
I'm having troubles with a few questions. A tennis ball is thrown vertically upwards. At the top of it's flight, it has: A. a zero speed and acceleration B. a zero speed and constant acceleration C. maximum speed and acceleration D. maximum speed but zero acceleration ...
November 6, 2008

1. Pages:
2. 1
3. 2
4. Next>>