# Posts by Jack

Total # Posts: 1,821

**physics**

A compact disc spins at 2.3 revolutions per second. An ant is walking on the CD and finds that it just begins to slide off the CD when it reaches a point 3.5 cm from the CD's center. What is the coefficient of friction between the ant and the CD?

**Networking**

.032%

**phy**

regarding #5: That answer would be correct if both balls were thrown at the same time. The problem states the red ball was thrown downward 2.6 seconds after the blue ball was thrown. One solution is to determine the position and velocity of the blue ball at the time the red ...

**physics**

Convert 25 meters to centimeters and gigameters.

**Physics**

Convert 25 meters to centimeters and gigameters.

**Physics**

Convert 25 meters to centimeters and gigameters.

**chemistry**

how do you calculate density of a substance with a mass of 100g and a volume of 48ml

**maths**

What are the steps to solve it? lim (x^2+y^2)/(sqrt(x^2+y^2+36)-6) as (x,y) approaches (0,0)

**physics**

A canoe has velocity of 0.40m/s southwest relative to earth.the canoe is on a river that is flowing 0.50m/s east relative to earth find the velocity (magnitude and direction) of the canoe relative to the river.

**physics**

plz anyway help me for the solution of this question. from the top of a tower P,a ball is thrown vertically upwards.when the ball reaches a distance h below P,its speed is double of what it was at height h above P.show that the greatest height attained by the ball above P is ...

**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?

**Math**

place decimal points in 190563 and 865 so that their difference is 181.913

**PreCal**

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

**PreCal**

Thank YOU!!!

**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.

**geometry**

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

**math**

How Can I Find The Value Of (10 ^ -0.1) (Without Using Calculator)

**maths**

270

**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.

**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?

**Approximation**

Find The Value Of (Sin 31) Using Approximation ?

**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?

**Trig**

Find [4(cos115+isin115)]^6

**Algebra**

4x+2y-3z=7 2x+4y+z=35 6x+2y-2z=20 solve the system

**geometry**

look at the right triangular prism. Which side is perpendicular to edge ce at point e?

**english**

Identify the complete Adjective clause The car i drive has 50,000 miles on the odometer. i need to find the Adjective clause in this sentence, Thanks, Jack

**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:

**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.

**computer science**

which job titles are consistent only with the java language?

**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

**writing**

What is the facts and figures that define the problem(cause)

**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)

**math**

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

**math**

find the slope: (-2,-2) (3,6)

**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 ...

**Algebra**

0.92

**res342**

I need to know what the correct anwser is a or b or c or d

**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 ...

**Number sence**

lol "Kamilah" you truly are an idiot... sorry i felt utterly compelled to say it.

**biology**

hi thanks but these sites are not answering my questions.

**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 ...

**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 ...

**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.

**Physics**

What is the importance of the Michelson-Morley experiment?

**Science**

Address is img291.imageshack.us/i/sc017942e5.jpg/

**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

**physics**

360Hz + 2Hz= 362Hz 360Hz - 2Hz = 358Hz 355 + 3Hz= 358Hz 355 - 3Hz= 352Hz Thus, 358Hz is the answer.

**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?

**math**

if anna drew a circle that has an area of 153.86 square meters what is the radius of anna's circle

**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

**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

**Algebra**

For how many two-digit prime numbers is the sum of its digits 8?

**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 ...

**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

**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.

**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.

**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?

**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 ...

**math**

Double my tens digit to get my ones digit. Double me and I am less than fifty.

**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.

**math**

I am less than 100. The sum of my didgits is 4. Half of me is an odd number.

**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 %.

**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 %.

**math**

There are about 3400 species that represent 90 percent in the world what is the total number.

**chemistry**

why does a solution of ammonium acetate has a pH=7.5

**calculus**

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

**operating system**

How do you change a word in the header. Then close Header/Footer when done?

**earth**

Was there any magnetic pulling during the Mesozoic Era?

**Algebra**

How many different points of intersection are there for x + y = 7 and y = x squared minus 7?

**math**

derivative of ln(x^3 + 2)

**Physics**

If the angle of incidence is 30 degrees, what is the angle of reflection?

**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

**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

**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. ...

**intermediate algebra**

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

**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

**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?

**English**

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

**English**

Thanks. Have a good night.

**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

**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. ...

**English**

1.dreamt 2.drank 3.sunk 4.taken 5.frozen 6.grown

**English**

Do you have another website to help me? I'm still confused. I looked over list.

**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...

**science**

if you weigh 100 pounds on earth than how much would you weigh on each other planet in our solar system

**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??

**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?

**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?

**math**

x=-2 output=12 x=1 output =9 x=4 output =6 help me solve

**math**

x=-2 output=12 x=1 output =9 x=4 output =6 help me solve

**math**

x=-2 output=12 x=1 output =9 x=4 output =6 help me solve

**chemistry**

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

**chemistry**

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

**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: 6u-w=6 mu+6w=-2

**New Age Math**

Given the initial augmented matrix -1 1 2 0 2 -1 -3 0 2 -2 -4 0 find the RREF

**physics**

change in momentum: p = m*(change in velocity) p = 91.8367 kg * (2 m/s) = 183.673 kg*m/s

**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

**physics**

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

**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

**physical chemistry**

i think i figured it out