Saturday

May 28, 2016
Total # Posts: 364

**Engineering**

For what values of (¢ belongs to R) the following system of equations has (1)no solution (2)a unique solution (3)infinitely many solutions? (5-¢)x+4y+2z=4 4x+(5-¢)y+2z=4 2x+2y+(2-¢)z=2 2) Consider three planes in R3. List all possibilities of their ...
*August 2, 2015*

**Engineering**

For what values of (¢ belongs to R) the following system of equations has (1)no solution (2)a unique solution (3)infinitely many solutions? (5-¢)x+4y+2z=4 4x+(5-¢)y+2z=4 2x+2y+(2-¢)z=2
*August 2, 2015*

**Engineering**

How to solve this equation : log(base10)x - log(base10)y = 2
*August 1, 2015*

**maths**

if the price of an orange was raised by 1/2k per orange, the number of oranges a customer can buy for #2.40 wil be less than 16.what is the price of an orange
*August 1, 2015*

**maths**

qustion(1)x^x=100, find x question(2):2x+2y<4,3x+4y>6 find the value of x&y that satisfy the inequalities qustion(3):x^x=100^x find x
*July 30, 2015*

**Maths**

qustion(1):find the product of xy if x,3/2,6/7,y are in a g.p qustion(2):calculate the angle between the vector u=2i+2j and v=2i+2ji qustion(3):if the center of a circle,the tangent from X touches A&B and AC is a diameter if AOB=47 calculateBOC
*July 30, 2015*

**maths**

if the radius of a sphere decreases by 0.1%,find the percentage decreases in (i)surface area (ii)volume
*July 28, 2015*

**Coordinate Graphing**

3x + 2=y; y=5
*May 24, 2015*

**Integers**

Some typical daily low temperature for Alaska cities in February are Anchorage, 12F, Fairbanks, 14F, Kotzebue, -12F, Gulkana, -7F, and Nome -4. Find the average of these temperatures.
*May 23, 2015*

**Integers**

A hockey players play minus rating compares the number of goals scored by his or her team (plus) to the number scored by the opponents (minus) while he or she is playing. In 1986 eight players on the San Jose Sharks had an average plus-minus rating of -17. What was the total ...
*May 23, 2015*

**Integers**

Suppose Frontier City Amusement Park bought a ferris wheel for $92,000. 42,512 people paid $2.00 each to ride the ferris wheel the first year. Ignoring the cost of operating how much money did the park lose on the ferris wheel it first year.
*May 23, 2015*

**Integers**

At 11:00 pm the temperature was -9 degrees. By 7:00 am the temperature had risen 18 degrees. What was the temperature at 7:00 am.
*May 22, 2015*

**integers**

A submarine was at a depth of 225 meters below sea level. It rose 80 meters, then it dove 35 meters. How far below sea level was the submarine after ascending and descending.
*May 22, 2015*

**Integers**

A scientist measured the temperature at the surface of a 7 inch deep snow. The temperature was -27 degrees. At ground level, the temperature was 24 degrees. How much warmer was the temperature at ground level.
*May 22, 2015*

**Math- integers**

The greenhouse effect occurs on many planets. If the actual temperature on Venus is -40 degrees, the temperature with the greenhouse effect is 800 degrees. What is the difference between the actual temperature and the temperature with the greenhouse effect.
*May 22, 2015*

**english**

What does the speaker in “Remembrance” plan to do? a. Forget her beloved. b. Live in mourning forever. c. Find a new love. d. Go on with her life.
*May 19, 2015*

**math**

Todd run 8 laps around a 400-meter track on Monday, 4 laps on Tuesday, 8 laps on Wednesday, 4 laps on Thursday, and 8 laps on Friday. How many kilometers did he run?
*May 19, 2015*

**Math**

A swimming pool is 75 feet long, 45 feet wide, and 8 feet deep. It is filled to a depth of 5 feet. What is the volume of the pool?
*May 19, 2015*

**Math**

What is the volume of a coffee can that is 6.5 inches high and has a diameter of 5 inches. round your answer to the nearest tenth.
*May 19, 2015*

**math**

HOMEOWNERS IN UNITED STATES USE MORE THAN 15 MILLION POUNDS OF PESTICIDES ON THEIR LAWNS EVERY YEAR. CONVERT THIS RATE TO OUNCES PER DAY ROUNDED TO THE NEAREST WHOLE NUMBER.
*May 16, 2015*

**PCM**

Please tell me websites for online chapter wise test series for jee advanced 2015 preparation. (Chapter wise) if not then mock test papers
*April 29, 2015*

**PCM**

Are there no papers to be downloaded on the device?
*April 27, 2015*

**PCM**

From which website I can get offline test papers(chapter wise) for preparation of Jee advanced 2015.
*April 27, 2015*

**General**

Thank u so much for your help Actually I m looking for indian universities.
*April 27, 2015*

**General**

Texas university......????? I can't get the name
*April 27, 2015*

**General**

How to get into Nasa after doing aerospace engineering from India? Could you please tell me best universities for aerospace engineering other than IIT's?
*April 27, 2015*

**math**

Deez nita
*April 7, 2015*

**physics**

Why the blood pressre in human greater at the feet than in the brain?
*April 6, 2015*

**college chemistry HARD**

Worcester state: pH- log[H-]<--H20<--> H + 0H-
*March 28, 2015*

**math**

while training for a marathon Anderson is supposed to run a total of 10 miles total during the week. he ran the following number of miles from Monday to Saturday: 4 1/2, 1 2/3, 4/6, 3 1/12, 1/6 how far did Anderson run during the week?
*March 25, 2015*

**physics **

a brass rod is 2 m long at a certain temperature. what is its length for a temperature rise of 100 K, if the expansivity of brass is 18 *10^-6K-1?
*March 7, 2015*

**Math**

1. Scale is 1 in.= 3 ft. If the room is 8 inches long and 2 inches wide on a blueprint, how much will it costs to clean the carpet if the costs is $15 per square foot?
*February 25, 2015*

**Geography**

69.5197° N, 139.5250° W Ivvavik national park
*January 11, 2015*

**chemistry**

did i answer the question: Explain how one of the major concepts learned in CHM 111 applies to everyday life. One major concept that was learned in CHM 111 that applies to everyday life is stoichiometry. Stoichiometry is founded on the law of conservation of mass where the ...
*January 11, 2015*

**ap chemistry**

did I answer the question?
*January 10, 2015*

**ap chemistry**

did i answer the question: Explain how one of the major concepts learned in CHM 111 applies to everyday life. One major concept that was learned in CHM 111 that applies to everyday life is stoichiometry. Stoichiometry is founded on the law of conservation of mass where the ...
*January 10, 2015*

**chemistry**

what major concepts makes chemistry useful in everday life?
*January 10, 2015*

**college chemistry**

what major concepts makes chemistry useful in everday life?
*January 10, 2015*

**ap chemistry**

how does chemistry apply to everday life?
*January 10, 2015*

**math**

It is a 4-digit number The tens are double the ones. The thousands are double the tens. The sum of the digits is 19. What number is it?
*December 8, 2014*

**Math**

b_n=(-2)^(n-1)
*November 30, 2014*

**marhs**

A wheel is free to rotate about its fixed axle. A spring with constant k = 290 N/m is attached to one of its spokes a distance r = 23 cm from the axle, as shown in the figure. (a) Assuming that the wheel is a hoop of mass m = 490 g and radius R = 0.97 m, what is the angular ...
*November 15, 2014*

**math**

f(x)= 1/3x^5 + x^-2 + 3, then f'''(x) is.. I got f'''(x)= 20x^2-24x^-5 Can you tell me if I got this right
*November 11, 2014*

**I need checking**

Whats the 2nd derivative of 4xsecx I got 4secxtanx+8xsecxtan^2x
*November 11, 2014*

**Math**

Whats the 2nd derivative of 4xsecx I got 4secxtanx+8xsecxtan^2x
*November 11, 2014*

**Derivatives check**

find the 2nd derivative of y= 1/x +cosxsinx I got 2/x^3 - 2cosxsinx is this right or did I get this wrong
*November 11, 2014*

**Information and communication technology**

please tell me new ideas regarding information and communication technology that have not yet used in daily life..
*November 7, 2014*

**Physics**

Three particles A, B, C start from the origin from the same time, A with velocity a along x-axis, B with velocity b along y-axis, C with velocity c in xy plane along a line x=y. What should be the magnitude of c so that they always remain collinear is (a). (a+b)/2 (b). √...
*November 6, 2014*

**physics**

A 80-kg man stands on a bathroom scale inside an elevator. (a) The elevator accelerates upward from rest at a rate of 1.40 m/s2 for 1.50 s. What does the scale read during this 1.50 s interval? N (b) The elevator continues upward at constant velocity for 8.50 s. What does the ...
*October 14, 2014*

**physics**

The figure below shows Superhero hanging motionless from a rope, with Trusty Sidekick hanging below him. Superhero's mass is 89.0 kg, while Trusty Sidekick's is 58.0kg, and the mass of the rope is negligible. (a) Find the tension in the rope at a point between ...
*October 14, 2014*

**English**

Sons By John Updilike How is the tone of the narrator?
*October 14, 2014*

**Physics**

I need help setting up this problem. A tennis player serves a tennis ball such that it is moving horizontally when it leaves the racquet. When the ball travels a horizontal distance of 19 m, it has dropped 58 cm from its original height when it left the racquet. What was the ...
*September 30, 2014*

**Physics**

I need help setting up this problem. While standing on the roof of a building, a child tosses a tennis ball with an initial speed of 15 m/s at an angle of 20° below the horizontal. The ball lands on the ground 2.8 s later. How tall is the building? Thank you.
*September 30, 2014*

**Physics Repost**

I need help setting up this problem. A tennis player serves a tennis ball such that it is moving horizontally when it leaves the racquet. When the ball travels a horizontal distance of 19 m, it has dropped 58 cm from its original height when it left the racquet. What was the ...
*September 30, 2014*

**Physics Repost**

I need help setting up this problem. While standing on the roof of a building, a child tosses a tennis ball with an initial speed of 15 m/s at an angle of 20° below the horizontal. The ball lands on the ground 2.8 s later. How tall is the building? Thank you.
*September 30, 2014*

**Physics**

I need help setting up this problem. While standing on the roof of a building, a child tosses a tennis ball with an initial speed of 15 m/s at an angle of 20° below the horizontal. The ball lands on the ground 2.8 s later. How tall is the building? Thank you.
*September 30, 2014*

**Physics**

I need help setting up this problem. A tennis player serves a tennis ball such that it is moving horizontally when it leaves the racquet. When the ball travels a horizontal distance of 19 m, it has dropped 58 cm from its original height when it left the racquet. What was the ...
*September 30, 2014*

**physics**

I need help attacking this problem A steel ball is dropped onto a hard floor from a height of 1.95 m and rebounds to a height of 1.87 m (assume positive direction is upward) A. Caculate it's velocity just before it strikes the floor B. calculate it's velocity just ...
*September 21, 2014*

**Physics**

A steel ball is dropped onto a hard floor from a height of 1.95 m and rebounds to a height of 1.87 m (assume positive direction is upward) A. Caculate it's velocity just before it strikes the floor B. calculate it's velocity just after it leaves the floor on its way ...
*September 20, 2014*

**Physics**

A steel ball is dropped onto a hard floor from a height of 1.95 m and rebounds to a height of 1.87 m (assume positive direction is upward) A. Caculate it's velocity just before it strikes the floor B. calculate it's velocity just after it leaves the floor on its way ...
*September 18, 2014*

**maths**

calculate the total surface area of a solid cone of slant height 10cm. use the value 3.14 for radius
*May 2, 2014*

**physics-impulse**

A tennis ball of mass m = 0.068kg and speed v = 21m/s strikes a wall at a 45∘ angle and rebounds with the same speed at 45 What is the magnitude of the impulse given to the ball?
*March 14, 2014*

**physics**

A child in a boat throws a 5.15-kg package out horizontally with a speed of 10.0 m/s. The mass of the child is 24.2kg and the mass of the boat is 33.2kg . Calculate the velocity of the boat immediately after, assuming it was initially at rest.
*March 14, 2014*

**ordering numbers( math) please help**

if you take five tests and come out with your grades. order these numbers from least to greatest 76% 8/10 90% 17/20 83% then find the average of the five quizzes
*February 10, 2014*

**Math**

Jacob is baking chocolate chips cookies. the recipe uses 3/4 cups of sugar. Jacob wants to make one half of a batch. how many cups of sugar does he need? 1/4
*January 30, 2014*

**Math**

Jacob is baking chocolate chips cookies. the recipe uses 3/4 cups of sugar. Jacob wants to make one half of a batch. how many cups of sugar does he need? 2/3
*January 30, 2014*

**health **

the key to using a pedometer to meet the physical activity guidlines for americans is to?
*January 4, 2014*

**science@@@@**

how to make a model for scince fair for purification of smoke coming out of chimneys? And how this purified smoke can be used for useful purposes? Does smoke contain moisture?
*October 20, 2013*

**math**

A street light is mounted at the top of a 19-ft-tall pole. A man 5.5 feet tall walks away from the pole with a speed of 14 ft/s along a straight path. How fast is the tip of his shadow moving when he is 100 feet from the pole?
*October 18, 2013*

**Finance**

Consider the following income statement and answer the questions that follow: Sales(100 units) $200 Variable costs (.80each) 80 Fixed costs 20 EBIT 100 Interest expense 30 EBT 70 Income tax 24 Net income 46 a)what is the firm's Breakeven Point in units? b)draw a breakeven ...
*October 8, 2013*

**scince@@@**

i have to make a model for science fair. Any new development!. So please give me only idea that which new development can be possible with the help of eddy currents or induction of emf...........
*September 28, 2013*

**Physics**

In a physics study group, a friend says in a profound tone that light is the only thing we can see. After a few laughs, your friend goes on to say that light is produced by the connection between electricity and magnetism. Is your friend correct? My responds is that my friend ...
*August 24, 2013*

**computer**

write the programing for following 1 2 3 4 5 6 7 8 9 10 10 9 8 7 6 5 4 3 2 1 1 1 2 1 2 3 1 2 3 4 1 1 1 1 1 2 2 2 2 2 3 3 3 3 3 4 4 4 4 4
*August 16, 2013*

**physics £££**

according to einstein's mass energy relation M= m'/root[1-(v^2/c^2)] Where M is mass of particle when it moves with velocity 'v' And m' is its initial mass. When particle moves with velocity of light i.e. When 'v=c' then M= m'/0 =infinity i.e. ...
*August 11, 2013*

**maths**

prove that 4cos36+cot15/2=1+4+9+16+25+36,ifcot15/2 is1+cos15/+sin15
*July 26, 2013*

**maths**

an amount of Rs 5000 is put into three/investments at the rate of interest of 6%, 7%, 8% per annum respectively; the total annual income is Rs 35800. If the combined income from first two investments is Rs 70 more than the income from the third. Find amount of each installment...
*July 1, 2013*

**physics**

how to show with the help of a model that resistivity of a conductor increases with increase in temperature?
*June 27, 2013*

**chemistry**

why acceleration at any instant does not velocity at any instant?
*June 23, 2013*

**chemistry**

show that accelration at any instant does not depend upon velocity at any instant?
*June 23, 2013*

**chemistry**

by using brain
*June 23, 2013*

**chemistry**

1)How can you determine average velocity from displacement time graph?
*June 23, 2013*

**physics**

prove that average velocity of particle over an interval of time is either smaller than or equal to average speed of particle over same interval?
*June 23, 2013*

**physics**

please give me some idea for making a working model based on optics. Like combination of light and lenses, spectrum etc......& how can i make a working model with the use of contact lenses....
*June 18, 2013*

**Grammar**

Jocelyn asked her mom, "What was it like when you were a child?"
*June 11, 2013*

**physics**

1.descibe the construction and working of machine used to generate high voltage? 2.draw electric lines between the plates of a parallel plate capacitor with 1(air) and 2(dielectric) as a medium? 3.near the surface of earth the field is about 100V/m. why do we then not ...
*June 10, 2013*

**physics**

how does the total energy stored in a capacitor change, when the medium of air is replaced by a medium of dielectric constaant K? Explain.
*June 10, 2013*

**chemistry**

what does 1M solution of sugar stands for?
*June 7, 2013*

**chemistry**

1.what is the advantage of heating gellium semi-conductor with sites or gold instruct of indium and boron? 2.why co-ordination number of 12 is not found in ionic crystals? 3.what kind of symmetry is exhibited by a match box?
*June 7, 2013*

**trigonometry**

sine is function 1/2cos^-1 is its angle. so i can convert cos^-1 into sin^-1 but can i cancel this with sin because there is (1/2).
*June 4, 2013*

**trigonometry**

1.if 2^x+2^y=2^(x+y) then dy/dx is equal to what? 2.If x.root(1+y)+y.root(1+x)=0 then dy/dx is equal to what? 3.Sin[(1/2)cos^-1(4/5)] is equal to what? 4.check the continuity of function f(x)=2x+3 at x=1. 5.check the continuity of the function F(x)={e^x - 1 -x ; x not equal to...
*June 4, 2013*

**mathematics**

1.)Sin^-1(x)+Sin^-1(y)+Sin^-1(z)= pie Prove that X.root(1-y^2)+y.root(1-x^2)+z.root(1-z^2)=2xyz 2.)tan^-1(yz/xr)+tan^-1(zx/yr)+tan^-1(xy/zr)=pie/4 Prove that x^2+y^2+z^2=r^2 Tomorrow is my exam.please give me answer as soon as possible.
*May 23, 2013*

**science**

there is technology day celebration in our school. I have to give a speech on a new technology that has developed recently and very rarely known. Please give me some ideas.
*May 8, 2013*

**physics**

I've done a and b, but I can't figure c out. Do I use G=6.67e-11?
*April 8, 2013*

**Science**

A Family travels 200 km in two hours and 20 min .then they stop to eat lunch.After lunch they travel 300 km In Two 3 Hours and 40min.What is the average speed during the entire trip?
*April 7, 2013*

**maths**

a matrix X has a+b rows and a+2 columns while the matrix Y has b+1 rows and a+3 columns. both matrices XY and YX exist. find a and b. can you say XY and YX sre of same type? are they equal?
*April 4, 2013*

**maths**

a trust fund has rs30000 that must be invested in two diferent types of bonds.the first bond pays 5% and second 7% interest per year. using matrix multiplication determine how to divide rs 30000 among two types of bonds if the trust must obtain na annual total interest of (a)...
*April 4, 2013*

**physics**

a ball rolling on oa inclined plane dors so with constant acceleration. One ball, A, is released from rest on th etop of an inclined plane 18m long to reach the bottom 3s later. At the same time as A is released, another ball, B, is projected up the same plane with a certain ...
*March 24, 2013*

**Chemistry**

Thank you so much!
*March 4, 2013*

**Chemistry**

A buffer consists of 0.16 M KHCO3 and 0.39 M K2CO3. Carbonic acid is a diprotic acid with Ka1 = 4.5 10-7 and Ka2 = 4.7 10-11. (a) Which Ka value is more important to this buffer? Ka1 Ka2 I don't understand this one at all. How do I determine which Ka value is more ...
*March 4, 2013*

**Chemistry**

I have no idea why I was having such a hard time with that one. Thank you so much for your help.
*March 4, 2013*