Saturday

September 5, 2015
Total # Posts: 1,448

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

**Math help once again**

10^y=x so 10^10=x
*January 27, 2011*

**chemistry**

thanks i solved it already
*January 27, 2011*

**chemistry**

Ammonia reacts with oxygen gas to form nitrogen monoxide and water. At constant temperture and pressure, how many of nitrogen monoxide can be made by the reaction of 800. ml of oxygen gas?
*January 27, 2011*

**Spanish**

it is asking if you have to have your lobster cooked with butter
*January 27, 2011*

**Math**

If line f is parallel to the line h, and line f has y-intercept 5, what is the equation of line f ? With h passing through two points (1, 2) and (3, 6)
*January 25, 2011*

**CHM**

Assuming the density of acetic acid solution is 1.0 g/mL, determine the volume of the acetic acid solution necessary to neutralize 25.0 mL of 0.10 M NaOH. Record this calculation on your report sheet
*January 25, 2011*

**Math**

If line g passes through point (2, 2) and is perpendicular to the line h, then what is the equation of line g? With h passing through two points (1, 2) and (3, 6)
*January 25, 2011*

**Math**

If line f is parallel to the line h, and line f has y-intercept 5, what is the equation of line f ? With h passing through two points (1, 2) and (3, 6)
*January 25, 2011*

**Math**

If line f is parallel to the line h, and line f has y-intercept 5, what is the equation of line f ? With h passing h through two points (1, 2) and (3, 6)
*January 25, 2011*

**algebra**

a rectangular sheet of plywood is seven times longer than its width,write an simlify an expression for the perimeter of the rectangle in terms of the width.
*January 24, 2011*

**linear algebra**

show that if L is any line through the origin in R3 and x is any vector with its initial point at the origin, then the reflection of x through the line l(acting as a mirror) is equal to 2(projection of x onto r)-x I don't know how to set this up. -x=2(projection of x onto ...
*January 24, 2011*

**marketing**

3M's main market for promoting this produc were college students. Their goal was to raise awareness of the Post-it flag highlighters within the the college community as much as possible. They used print ads in college newspapers and TV ads and relayed on word of mouth ...
*January 24, 2011*

**Physics**

A golf ball is chipped at an angle of 49 degrees and with a speed of 8.5 m/s. How far does it travel to the nearest tenth of a meter?
*January 23, 2011*

**chem**

At 20 degrees celsius the vapor pressure of dry ice is 56.5atm. If 10 g of dry ice (solid CO2) is placed in an evacuated 0.25 L chamber at a constant temperature of 20 degrees celsius, will all of the solid sublime? Is the answer no? I don't know if this is right, but I ...
*January 22, 2011*

**Chemistry**

What do I do when writing the net ionic equation for Magnesium nitrate reacted with sodium chloride? I've wrote out the molecular equation and the total ionic equation. Everything cancels out....under my total ionic equation do i just write no reaction? |thanks!
*January 19, 2011*

**physics**

two masses m' each are hanging with help of a light string,which passes over mass less pulley. mass A starts leaking out at a rate of u kg/s with velocity v' with respect to mass A. find kinetic energy of block B as a function of time.
*January 16, 2011*

**physics**

a student standing on the roof of a 50 meter high building kicks a stone at a horizontal speed of 4 meters per second, how much time is required for the stone to reach the level ground below?
*January 16, 2011*

**grammar**

Ok thanks, so there are only two avderbs in this entire paragraph?
*January 13, 2011*

**grammar**

Need to identify five adverbs in this paragraph. I think I am correct but would like a second opinion. Thanks for your thoughts. LITTLE FOCKERS is the “continued” (adverb) antics of Greg and Pam Focker (Ben Stiller and Teri Polo) who “now” (adverb) have two...
*January 13, 2011*

**nuclear engineering**

Determine the amount of energy required (in MeV) to dissociate the following elements into component parts (protons, neutrons and electrons) • Hydrogen • Deuterium • Tritium
*January 13, 2011*

**Math**

Solve the proportion for u. (u-2):(u+3) = 4:3
*January 12, 2011*

**math**

On the unit circle the coordinates of P(theta) are (0.588, 0.809). Find the coordinates of P(2theta). Please help.
*January 11, 2011*

**Math**

A sweepstakes posted the odds and payoffs. Suppose that mailing the sweepstakes costs $0.33 and the odds in favor of winning the various prizes are listed in the chart below. What is the expected value of the sweepstakes for any individual? Considering the postage, is the ...
*January 11, 2011*

**math**

Can the expression (r-3)(s+2) be simplified without knowing the values of r and s?
*January 10, 2011*

**math**

If the probability of an event happening is 1/7, what are the odds against it happening? What is the ratio of the odds against the event?
*January 10, 2011*

**Algebra**

Two questions? Build a patio-hypotenuese is 50 feet long the two sides of patio are same. What is the length of one side of the patio I think I set it up a^2 + b^2 = c^2 a^2 + b^2 = 50^2 a^2+ b^2 = 2500 then I just could say 2a^2 = 2500 a^2 = 2500/2 a^2 = 1250 sqrt of 1250 = ...
*January 5, 2011*

**Chemistry**

I've got 21.2L, but supposedly correct answer is 21.7L. How?
*December 13, 2010*

**Chemistry**

Given 20.0 L of ammonia gas at 5C and 730 torr, calculate the volume at 50C and 800 torr
*December 13, 2010*

**science**

Chapter 1 & 2 Review Questions 1. Compare and Contrast the two main branches of physical science. 2. Distinguish between scientific laws and scientific theories. 3. Describe the steps of the scientific method. 4. Explain the objective of a consistent system of units, and ...
*December 13, 2010*

**math**

if possible, change each comparison of concentrate to water into a ratio. If not, explain why. a. the mix is 60% concentrate. b. the fraction of the mix that is water is 3/5 c. the difference between the amount of concentrate and water is 4 cups
*December 7, 2010*

**accounting**

Does the flexible budget term mean A series of budgets for varying rates of activity?
*December 7, 2010*

**math**

if you have a apple juice mix of 5 cups concentrate to 8 cups water, if you only make 1 cup of mix, how much water and how much concentrate do you need?
*December 6, 2010*

**10th grade**

How many grams of cacl2 are in 4.3l solution of 2.8 m cacl2
*December 3, 2010*

**physics**

thank you so much!!!
*December 2, 2010*

**physics**

yes i understand A but in B it's increasing the speed at a rate (which means acceleration) of 1.45 m/s^2 and thats where i get lost
*December 2, 2010*

**physics**

(A.) A hawk flies in a horizontal arc of radius 13.4 m at a constant speed of 4.5 m/s. Find its centripetal acceleration. Answer in units of m/s2. (B.) It continues to fly along the same horizon- tal arc but increases its speed at the rate of 1.45 m/s2. Find the magnitude of ...
*December 2, 2010*

**physics**

(A.) A hawk flies in a horizontal arc of radius 13.4 m at a constant speed of 4.5 m/s. Find its centripetal acceleration. Answer in units of m/s2. (B.) It continues to fly along the same horizon- tal arc but increases its speed at the rate of 1.45 m/s2. Find the magnitude of ...
*December 2, 2010*

**physics**

Wouldn't it be zero. It's speed at the top and bottom are zero so...
*December 2, 2010*