Tuesday
March 3, 2015

Posts by Jack


Total # Posts: 1,385

physics
a roller whose diamater is 1.0m.weight 360N.what horizontal force is necessary to pull the roller over a brick 0.1m,heigh when the force is applied at the centre?
September 10, 2011

Math
place decimal points in 190563 and 865 so that their difference is 181.913
September 7, 2011

PreCal
Find the distance between P1(3, –195°) and P2(–4, –94°) on the polar plane. Round your answer to the nearest thousandth.
September 5, 2011

PreCal
Thank YOU!!!
September 3, 2011

PreCal
A surveyor records the polar coordinates of the location of a landmark as (40, 62°). What are the rectangular coordinates? Round each coordinate to the nearest hundredth.
September 3, 2011

geometry
find the variable and LN if M is between L and N LM=8a,MN= 7a,LM=56
August 30, 2011

math
How Can I Find The Value Of (10 ^ -0.1) (Without Using Calculator)
August 28, 2011

maths
270
August 27, 2011

Geometry
A company produces cardboard boxes with the top, bottom and sides measuring 5 feet. It costs the company 4 cents a square foot to make each box. The square footage is determined by finding the area of all six sides of the box. Find the cost to make 100 boxes.
August 27, 2011

Physics
A roller coaster moves 85m at 35 degrees S of W, and then travels 30 m at 45 degrees W of N. What is its displacement from its starting point?
August 24, 2011

Approximation
Find The Value Of (Sin 31) Using Approximation ?
August 22, 2011

math
A Glass Of Water Is Being Filled With Water At The Rate Of 12 Pi Cm^3/sec And the radius of the top is 6 cm and the radius of the base is 3 cm and the height of the glass is 12 cm , find A) dh/dt and B) radius when the height of water is half?
August 11, 2011

Trig
Find [4(cos115+isin115)]^6
July 25, 2011

English Grammar
Hello
July 10, 2011

Algebra
4x+2y-3z=7 2x+4y+z=35 6x+2y-2z=20 solve the system
June 19, 2011

geometry
look at the right triangular prism. Which side is perpendicular to edge ce at point e?
June 13, 2011

Chemistry
A solution of hydrochloric acid is placed on a balance. Magnesium metal is added and the mass is recorded. The solution is stirred and the mass of the solution is recorded every 10 minutes. The following data is collected:
June 7, 2011

algebra
Could somebody tell me in simple terms why equating coefficients works in partial fraction decomposition? Like a simplified proof or something? I don't understand why.
June 6, 2011

computer science
which job titles are consistent only with the java language?
May 26, 2011

math
Two trains leave a train station at the same time. One travels east at 10 miles per hour. The other train travels west at 9 miles per hour. In how many hours will the two trains be 85.5 miles apart
May 24, 2011

writing
What is the facts and figures that define the problem(cause)
May 20, 2011

math
Find all the points having an x-coordinate of 9 whose distance from the point (3, -2) is 10. (9, 6), (9, -10) (9, 13), (9, -7) (9, -12), (9, 8) (9, 2), (9, -4)
May 18, 2011

math
If (3, b) is a point on the graph of 3x - 2y = 17, what is b? -4 4 11/3 23/3
May 18, 2011

math
find the slope: (-2,-2) (3,6)
May 18, 2011

math
In his algebra class, Rob has scores of 79, 85, 81, and 65 on his first four tests. To get a grade of C, the average of the first five tests must be greater than or equal to 70 and less than 80. Solve an inequality to find the range of scores that Rob can earn on the fifth ...
May 18, 2011

res342
I need to know what the correct anwser is a or b or c or d
May 14, 2011

res342
In conducting research that looks at differences in populations, samples are used for numerous reasons. Using entire populations in a test is difficult, so various sampling techniques are applied. In situations in which the population variance is unknown, the Student t ...
May 14, 2011

Number sence
lol "Kamilah" you truly are an idiot... sorry i felt utterly compelled to say it.
May 11, 2011

biology
hi thanks but these sites are not answering my questions.
May 7, 2011

biology
14 points Save A photosynthesis experiment uses Chlorella to track the route taken by 14C in photosynthesis. The 14C is provided from CO2 and no new sources of CO2 are available. After the experiment the scientist extracts all of the starch produced and analyses the Carbon ...
May 7, 2011

science - biology
A photosynthesis experiment uses Chlorella to track the route taken by 14C in photosynthesis. The 14C is provided from CO2 and no new sources of CO2 are available. After the experiment the scientist extracts all of the starch produced and analyses the Carbon present. She ...
May 7, 2011

math
There are 4 seats in each row of a bus except the last row, which has 5 seats. The total number of seats can be written as 5 + r x 4. Determine the number of seats in a bus for each value of r.
May 4, 2011

Physics
What is the importance of the Michelson-Morley experiment?
May 3, 2011

Science
Address is img291.imageshack.us/i/sc017942e5.jpg/
May 3, 2011

Science
The drawing bellow(click go to address img291.imageshack.us/i/sc017942e5.jpg/ to see picture of image) shows two students performing an experiment. Make a list of the things the students are doing incorrectly
May 3, 2011

Physics
an object that is 6 cm in height is put 9 cm from a convex lens. The lens has a focal length of 8 cm. What is the size of the image?
April 26, 2011

math
if anna drew a circle that has an area of 153.86 square meters what is the radius of anna's circle
April 26, 2011

literature
in at least 4 sentences, compare and contrast the literary elements in the autobiographies of frederick douglass (my bondage and my freedom) and benjamin franlin
April 19, 2011

physics
an electric motor lifts on elevator 9 m in 15s by exerting an upward force of 1.2 x 10^4 calculate the power
April 18, 2011

Algebra
For how many two-digit prime numbers is the sum of its digits 8?
April 14, 2011

physics
Two charges are located along the x-axis. One has a charge of 6.2 µC, and the second has a charge of −3.1 µC. The Coulomb constant is ke = 8.98755 × 10 9 N m2 /C 2 The acceleration of . gravity is 9.81 m/s 2 . If the electrical potential energy ...
April 11, 2011

math
The n th term (Un) of a progression geometric is given by the formula 2(1.1)^n. Find the least value of n such that Un ≥ n
April 11, 2011

uniform motion science
How would you set up the following unifor motion problem... How long will it take the plane to fly 1000 km (i mile=1.61 km) if it is traveling at a constant velocity of 80 km/hr.
April 10, 2011

Science
How would you set up the following unifor motion problem... How long will it take the plane to fly 1000 km (i mile=1.61 km) if it is traveling at a constant velocity of 80 km/hr.
April 9, 2011

Algebra
what is the positive difference in the sums of the letters in the words MATH and COUNTS, if each letter is assigned a value as follows: A=1, B=-2, C=3, D=-4, ..., Y=25, Z=-26?
April 2, 2011

Algebra
A 5 digit positive integer is a "mountain number" if the first 3 digits are in ascending order and the last 3 digits are in descending order. For example, 35 761 is a mountain number, but 32 323 and 35 655 are not. How many 5 digit numbers greater than 70 000 are ...
April 2, 2011

math
Double my tens digit to get my ones digit. Double me and I am less than fifty.
March 28, 2011

math
If you multiply me by 2, I become a number greater than 20 and less than 40. If you multiply me by 6,I end in 8. If you multiply me by 4 I end in 2.
March 28, 2011

math
I am less than 100. The sum of my didgits is 4. Half of me is an odd number.
March 28, 2011

Chemistry
Quicklime (CaO) can be prepared by roasting limestone (CaCO3) according to the reaction CaCO3(s)  −!CaO(s) + CO2(g) . When 2.6 ×10^3 g of CaCO3 are heated, the actual yield of CaO is 1.06 ×10^3 g. What is the percent yield? Answer in units of %.
March 23, 2011

Chemistry
When 2.6 ×103 g of CaCO3 are heated, the actual yield of CaO is 1.06 ×103 g. What is the percent yield? Answer in units of %.
March 23, 2011

math
There are about 3400 species that represent 90 percent in the world what is the total number.
March 16, 2011

chemistry
why does a solution of ammonium acetate has a pH=7.5
March 16, 2011

calculus
y=x^3 y=8 x=0 about x-axis its using shell method i need step by step help seriously !!!!
March 14, 2011

operating system
How do you change a word in the header. Then close Header/Footer when done?
March 7, 2011

earth
Was there any magnetic pulling during the Mesozoic Era?
February 28, 2011

Algebra
How many different points of intersection are there for x + y = 7 and y = x squared minus 7?
February 27, 2011

math
derivative of ln(x^3 + 2)
February 23, 2011

Physics
If the angle of incidence is 30 degrees, what is the angle of reflection?
February 21, 2011

Intermediate Algebra
Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this. 10x + 7y = -120.5 -20x – 14y = 241
February 20, 2011

College Algebra
Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this. <P-3x + 6y = -3 -6x + 4y = -10
February 20, 2011

algebra
To buy both a new car and a new house, Tina sought two loans totalling $260,394. The simple interest rate on the first loan was 3.7%, while the simple interest rate on the second loan was 8.8%. At the end of the first year, Tina paid a combined interest payment of $22,611.73. ...
February 20, 2011

intermediate algebra
Determine whether the point (0, 8) is a solution of the system -3x + 9y = 72 / 9x + 3y = 24
February 19, 2011

intermediat algebra
. Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this. -2x + 9y = 56 9x – 9y = 0
February 19, 2011

Physics
If two electrons (q = 1.60 x 10–19 C) are 1 m apart, what is the magnitude of the electric force repelling the two electrons?
February 18, 2011

English
1.Weren't you ______ to help me wash the dishes? (suppose) I have use correct form of suppose. Would it be suppose?
February 15, 2011

English
Thanks. Have a good night.
February 14, 2011

English
Using the correct form of (eat, ate, sit, set) 1.Someone (eat) all the leftover sandwiches. 2.Thank you, but I have already (ate, eaten) lunch. 3.After splitting the logs, the farmer (sat, set) his ax on the ground. 1.ate 2.eaten 3.set
February 14, 2011

English
1.We (see) tropical fish in the warm waters surrounding the island. 2.Have you (speak) to your parents about the field trip? 3.Teresa has (choose) the smallest piece of chicken. 4.Yesterday someone on the radio (sing) a song about Brazil. Just seeing if I have hang of it now. ...
February 14, 2011

English
1.dreamt 2.drank 3.sunk 4.taken 5.frozen 6.grown
February 14, 2011

English
Do you have another website to help me? I'm still confused. I looked over list.
February 14, 2011

English
1.I have often (dream) of becoming a great writer. 2.I (drink) two glasses of orange juice at breakfast today. 3.Their new boat (sink) in six feet water. 4.Generation have (take) wood and food from the rain forests. 5.The canal has (freeze), and the ferry can't get through...
February 14, 2011

science
if you weigh 100 pounds on earth than how much would you weigh on each other planet in our solar system
February 14, 2011

math
x^2 + y^2 - 8x -2y -3 = 0 the points S and T lie on the circumference of the circle. M is the midpoint of the chord ST. Length of Centre C to M is 2. whats the length of ST??
February 13, 2011

Physics
Nick, I'm working on this one myself. You can deduce from V = sqrt (T/M) where M=mass/length that f*2L = sqrt (T/M) but I keep getting the wrong answer for L. Unit conversion maybe?
February 10, 2011

business math
Stereo Inc. sells a stereo system for $300 down and monthly payments of $80 for the next 3 years. If the interest rate is 3.25 % per month, what is the cost of the stereo?
February 9, 2011

math
x=-2 output=12 x=1 output =9 x=4 output =6 help me solve
February 9, 2011

math
x=-2 output=12 x=1 output =9 x=4 output =6 help me solve
February 9, 2011

math
x=-2 output=12 x=1 output =9 x=4 output =6 help me solve
February 9, 2011

chemistry
how do you Prepare a 0.1 L of a 0.1 M NaCl solution, and describe the process in writing.
February 9, 2011

chemistry
how do you Prepare a 0.1 L of a 0.1 M NaCl solution, and describe the process in writing.
February 9, 2011

New Age Math
A value of the number m for which there is either no solution or an infinite number of solutions (u,w) to the system of equations shown below is: 6⁢u-w=6 m⁢u+6⁢w=-2
February 5, 2011

New Age Math
Given the initial augmented matrix -1 1 2 0 2 -1 -3 0 2 -2 -4 0 find the RREF
February 5, 2011

physics
change in momentum: p = m*(change in velocity) p = 91.8367 kg * (2 m/s) = 183.673 kg*m/s
February 3, 2011

physics
F = m*a 900N = m*(9.8m/s^2) m = 91.8367 kg a = (change in velocity) / (change in time) a = (Vf - Vi) / (change in time) a = (2 - 0) / (.7) = 2.85714 m/s^2 F = 91.8367 kg * 2.8571 m/s^2 = 262.391 N
February 3, 2011

physics
the mass you use is not 60g, it is .06kg. Sorry. Answer is .00015 sec.
February 3, 2011

physics
f=m*a 30000N = 60g * a a = (change in velocity) / (change in time) 30000N = 60g * (Vf - Vi) / (change in time) 500 = (75 - 0) / (change in time) change in time = .15 sec the change in time is the time that the ball was in contact with the club
February 3, 2011

physical chemistry
i think i figured it out
February 3, 2011

physical chemistry
1 kg aluminum dumbbell initially held 2 meters above the floor is allowed to fall. This experiment is performed inside a room whose dimensions are 10m × 5m × 3m. Assuming that the walls of the room do not conduct heat and that the room is empty (no other objects ...
February 3, 2011

Chemistry
How do I balance this equation and what is the answer? C3H9N+O2-->CO2+H2O+NO2
February 2, 2011

Chemistry
How much ice is required to cool a 15.0 oz drink from 71 F to 34F, if the heat capacity of the drink is 4.18 J/g*C? (Assume that the heat transfer is 100 % efficient.)
February 1, 2011

english
What is 7 letter word for finished. 3rd letter is R and 5th letter is U
February 1, 2011

physics
Modern lasers can create a pulse of light that lasts only a few femtoseconds. (a) What is the length of a pulse of red light that lasts 6.2 fs? (b) How many wavelengths of red light (ë = 680 nm) are included in such a pulse?
January 30, 2011

physics
Modern lasers can create a pulse of light that lasts only a few femtoseconds. (a) What is the length of a pulse of red light that lasts 6.2 fs? (b) How many wavelengths of red light (ë = 680 nm) are included in such a pulse?
January 30, 2011

operating system
in windows vista, how do you organize file list by file size?
January 30, 2011

chemistry
V=359L
January 27, 2011

chemistry
What volume does a mixture of 14.2g of helium and 21.6g of hydrogen gas occupy at 28 degrees celcius and .985atm?
January 27, 2011

5th grade math
my bad it is 2/5 not 3/5
January 27, 2011

5th grade math
3/5 change the denominator to 15 by multiplying by 3 so it is 9/15-3/15=6/15 if you reduce it is 3/5
January 27, 2011

Spanish
22. C 23 a
January 27, 2011

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