Thursday

June 30, 2016
Total # Posts: 2,144

**Chemistry**

How do I calculate the solubility of a compound in grams of solute per 100 grams of solution?
*April 16, 2011*

**algebra**

How many different seven digit phone numbers are available if the only restriction is that the first digit cannot be 0.
*April 14, 2011*

**Algebra**

Guess the 4-digit combination. An X stands for a correct digit in its correct place in the combination and an O stands for a correct digit out of its corect order. 8256 OX Two of the four digits 8,2,5,6 appear in the final combination(one in the position given(for example 6 ...
*April 9, 2011*

**Science**

Hi, I asked this question earlier, but didn't get any replies. If anybody could help, it would be extremely appreciated! A 225 kg box is loaded onto a truck by pulling it up an inclined plane (10 m hypotenuse difference) by a force that is parallel to the incline (T = 315 ...
*April 7, 2011*

**Physics**

A 225 kg box is loaded onto a truck by pulling it up an inclined plane (10 m hypotenuse difference) by a force that is parallel to the incline (T = 315 N). If the bed of the truck is 1.2 m above the ground what is the efficiency of this simple machine in loading the box into ...
*April 7, 2011*

**MATLAB**

Find the value of x (to 2 decimal places) when y is a minimum, using a while loop. Format the answer, e.g., "At x=ii.ii, y=jj.jj is a minimum". Plot the function. y = x^2 - 4x + 2
*April 6, 2011*

**physics**

You look up and see a helicopter pass directly overhead: 3.10-s later you hear the sound of the engines. If the air temperature is 23.0°C, How high was the helicopter flying?
*April 5, 2011*

**Algebra**

What is the positive difference in the sum 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 4, 2011*

**math**

Provide an example of an arithmetic series which totals zero. Using complete sentences, explain how you created the example.
*April 2, 2011*

**math**

When finding the sum of the arithmetic sequence 4 + 1 + –2 + –5 + –8 + –11, you will have a step of work that contains the number –3. Use complete sentences to describe how the –3 was calculated and what it means.
*April 2, 2011*

**math**

What is the common difference of a 43–term arithmetic sequence where the first term is –13 and the sum is 9,374?
*April 2, 2011*

**math**

What is the sum of the arithmetic sequence 22, 13, 4 … if there are 28 terms?
*April 2, 2011*

**math**

What is the sum of a 12–term arithmetic sequence where the last term is 13 and the common difference is –10?
*April 2, 2011*

**math**

The windows of a downtown office building are arranged so that each floor has six fewer windows than the floor below it. If the ground floor has 52 windows, how many total windows are on the first eight floors?
*April 2, 2011*

**math**

What is the sum of a 10–term arithmetic sequence where the first term is 3 and the last term is 75?
*April 2, 2011*

**physics**

A beam of light makes an angle of θi = 7.0˚ with the normal of a slab of transparent material of t=1.00-mm-thickness. If the index of refraction of the glass is n2 = 1.40 , how far vertically (d) is the point at which the beam leaves the glass surface from the point ...
*April 2, 2011*

**physics**

A beam of light makes an angle of 13.0° with the normal of a mirror made of 4.70-mm-thick glass silvered on the back. If the index of refraction of the glass is 1.30, how far is the point at which the beam leaves the glass surface (after being reflected from the silver ...
*April 2, 2011*

**Calculus**

Use five iterations in Newton’s method to estimate the root of cos(2x)-2x.Use x0 = π/4 and eight decimal places.
*April 2, 2011*

**physics**

The four wires that lie at the corners of a square of side a= 5.60 cm are carrying equal currents i= 1.80 A into (+) or out of (-) the page, as shown in the picture. Calculate the x-component of the force on a 1.0-cm long piece of the lower right-hand wire, due to the other ...
*March 28, 2011*

**Calculus.**

What is the derivative of [(3t+4)/(6t-7)]^3?
*March 27, 2011*

** MAth Im stuck on question can anyone help me ?**

I think it is C becuase the denominator would be 2*2*2 which would be 8.
*March 27, 2011*

**chemistry**

what volume of nitrous oxide gas N2O has the same number of atoms as 9.0 liters of neon gas at the same temperature and pressure
*March 26, 2011*

**Calculus**

ok, thats what i got! thanks so much
*March 24, 2011*

**Calculus**

What is the limit as t approaches 0 for (sint)/(1+cost)?
*March 24, 2011*

**Statistics **

Twenty people are to be seated at 3 Circular restaurant tables that seat 8,7, and 5 people respectively. Determine the number of ways that this can be done. Express your answer in scientific notation to two decimal place.
*March 20, 2011*

**Physics**

A cirular coil of 19 turns and radius 10.2cm surrounds a long solenoid of radius 2.6cm and 1.00x103 turns per meter. The two are oriented so that the axis of the coil and the axis of the solenoid are parallel and the center of the coil is at the center of the solenoid. If the ...
*March 11, 2011*

**Physics**

A cirular coil of 27 turns and radius 15.0cm surrounds a long solenoid of radius 4.7cm and 1.00x103 turns per meter. The two are oriented so that the axis of the coil and the axis of the solenoid are parallel and the center of the coil is at the center of the solenoid. The ...
*March 11, 2011*

**religion**

what sociopolitical issues helped spur the Reformation?
*March 8, 2011*

**Math**

If glenda rolled two six-sided number cubes nine times and computed the sum of the numbers rolled each time. If the mean sum of Glenda's rolls was 6 what was the total of the nine sums Glenda rolled? Suppose Glenda's rolls were 12,7,3,10,9, 2, 11, 7 and 8. What is the ...
*March 8, 2011*

**chemistry**

What is the pH of a 2.23 M HCHO2, formic acid, aqueous solution at 25 °C? ( Ka = 1.8E-4 )
*March 4, 2011*

**math**

A drawer contains 7 black socks, 5 white socks, and 3 brown socks. What is the probability that 2 white socks will be removed in succession?
*March 1, 2011*

**physics**

In the high jump, the kinetic energy of an athlete is transformed into gravitational potential energy without the aid of a pole. With what minimum speed must the athlete leave the ground in order to lift his center of mass 1.65 m and cross the bar with a speed of 0.75 m/s?
*March 1, 2011*

**Quantitative methods**

Assignment Problem 1* Print Media Advertising (PMA) has been given a contract to market Buzz Cola via newspaper ads in a major southern newspaper. Full-page ads in the weekday editions (Monday through Saturday) cost $2000, whereas on Sunday a full-page ad costs $8000. Daily ...
*February 27, 2011*

**Physics**

What is the time lapse between seeing the lightning strick and hearing the thunder 17 km away
*February 23, 2011*

**physics**

A mass of 0.755 kg is attached to a horizontal spring of constant 403 N/m as shown. The system is compressed a distance xa = 20.8 cm from its equilibrium position and released from rest. The coefficient of friction on the surface is μ = 0.354. The mass comes to rest again...
*February 23, 2011*

**Physics**

emily, the question is 72 CM, not 72 meters. convert the 72cm into .72m. (mass) X (Speed)2/(distance .72) - (mass)(gravity) for the other other one add the two together.
*February 22, 2011*

**Physics**

Use the kinematic equation v^2=u^2+2ax When you find the acceleration multiply it by the mass of the block on the table
*February 20, 2011*

**Math**

two people aged 15 and 50. At some point during their lives, the elder will be three times the age of the younger. Write an equation which models how old in years each will be when the elder will be three times as old as the younger person.
*February 20, 2011*

**PHYSICS**

A copper vat is 10 m long at room temperature (20 degrees C). How much longer it is when it contains boiling water at 1 atm pressure? Air in a balloon does 50 J of work while absorbing 70 J of heat. What is its change in internal energy? A bottle containing 3 kg of water at a ...
*February 17, 2011*

**Math**

Determine whether u and v are orthogonal,parallel, or neither. u=-2i+j v=3i+6j
*February 16, 2011*

**Math**

An airplane has an airspeed of 724 kilometers per hour at a bearing of 30 degrees.The wind velocity is 32 kilometers per hour from the west. What are the groundspeed and the direction of the plane?
*February 16, 2011*

**General Chemistry 1**

If you heat copper sulfate pentahydrate to long or at too high of a temperature, what compound(s) is formed?
*February 14, 2011*

**math 2**

What is the scale factor for 1 inch = 20 feet?
*February 10, 2011*

**Calc**

derivative of (x^2+14)/x
*February 8, 2011*

**Chemistry**

the value 3.0x10^-5 was wrong for me?
*February 8, 2011*

**Calculus-particle motion**

1. A particle is moving on the x-axis (or any number line) Its position x(t), or distance from the origin, at the time t is given by x(t)=4t^3-16t^2+15t. t is greater than or equal to 0 a.) Where is the particle when it is at rest? b.) During what time interval is the particle...
*February 7, 2011*

**Biology**

In a cell undergoing meiosis, which sequence of events is shown in correct order? A. the cytoplasm divides, chromosomes line up at the equator, nuclear envelope forms. B. chromosomes become visible, chromosomes line up at the equator, chromosomes gather at the poles of the ...
*February 4, 2011*

**Physics**

A 31.0 kg crate, initially at rest, slides down a ramp 2.6 m long and inlined 14 degrees with the horizontal. Using the work-kinetic energy theorem and disregarding friction, find the velocity of the crate at the bottom of the ramp
*February 3, 2011*

**Physics-Help Please!!!**

A 31.0 kg crate, initially at rest, slides down a ramp 2.6 m long and inlined 14 degrees with the horizontal. Using the work-kinetic energy theorem and disregarding friction, find the velocity of th crate at the bottom of the ramp
*February 3, 2011*

**Physics**

A 31.0 kg crate, initially at rest, slides down a ramp 2.6 m long and inlined 14 degrees with the horizontal. Using the work-kinetic energy theorem and disregarding friction, find the velocity of th crate at the bottom of the ramp.
*February 3, 2011*

**Physics**

Marko 1.51^2 /g doesn't equal 2.2801g it equals 2.2801/g. So your answer is the reciprical of the right answer. Nice try though.
*February 3, 2011*

**algebra**

You have to subract the second equation from the first equation. Make sure to put the second equation in parenthases and distrbute the negative sign!
*February 2, 2011*

**chemistry**

An unknown metal will be used in this experiment. If you do not remove the moisture between trials houw would moisture effect the dendity in a graduated cylinder calculation?
*January 31, 2011*

**Dynamics**

Car A is moving at a constant speed Va=75 km/h, while car C is moving at a constant speed Vc=42 km/h on a circular exit ramp with radius p=80m. Determine the velocity and acceleration of C relative to A.
*January 30, 2011*

**Calc**

Suppose that a function f(125)=52 and f'(125)=4. Estimate f(123.5)
*January 29, 2011*

**Calc**

suppose that f(x) is a function of f(125)=52 and f'(125)=4. estimate f(123.5)
*January 29, 2011*

**chemistry**

How many molecules of ethane (C2H6) are present in 0.524 g of C2H6?
*January 28, 2011*

**Biology**

Which of the following statements about sexual and asexual reproduction is FALSE? A)Genetic diversity occurs in sexual reproduction. B)Asexually reproducing organisms can repair their own DNA. C)There are no special reproductive cells in asexual reproduction. D)A gametophyte ...
*January 28, 2011*

**12th grade chemistry**

If the reaction below proceeds with a 96.8% yield, how many kilograms of CaSO4 are formed when 5.27 kg SO2 reacts with an excess of CaCO3 and O2? 2 CaCO3(s) + 2 SO2(g) + O2(g) 2 CaSO4(g) + 2 CO2(g)
*January 27, 2011*

**math**

a sum of 102,000 is to be split by 3 people, (1) gets 5 times as much as (2) which gets 2/5 as much as (3). how is this problem solved
*January 26, 2011*

**Business**

Hey guys. I really need your help picking out a new business name. Which do you like/find catchier??? The business is a local "swapping" online site. Thanks a lot. SwapEm Swap Ventures SwapEm Local
*January 26, 2011*

**physics**

Explain the effect increasing temperature has on the following situations and what is happening at the molecular level to cause it. (a) the speed of sound in air (b) the current in a wire THANKS
*January 25, 2011*

**Calculus**

find the limit of lim 7= as x approaches 8
*January 24, 2011*

**math**

where did you get the 2?
*January 20, 2011*

**math**

how do you find the square root of 49x^5?
*January 20, 2011*

**science project**

need to take an object from point a to point b and back to a and your only allowed to touch the project once to start. any ideas? No batteries, electric or blowing on it allowed. You can use water and magnets.
*January 16, 2011*

**math**

im pretty sure its 256. These r permutations right
*January 13, 2011*

**math**

mr. m has an 8 inch by 11 inch sheet of paper. He created a box by cutting congruent squares from each corner.The base of his box is 54 square inches.How much did he cut from each corner.
*January 13, 2011*

**Science**

nucleus
*January 13, 2011*

**physics**

A 1200 kg car is traveling at 45 km/h and hits a 1000 kg car parked on the edge of a 70 m deep canyon. What is the velocity of the two car wreck?
*January 12, 2011*

**math**

it is a typo the problem starts at the word Jocelyn
*January 12, 2011*

**math**

J1 3/4 Jocelyn is currently 1 3/4 feet taller that 2/3 her brother's height. If jocelyn is 4 1/2 feet tall then how tall is her brother jesse? How much taller is Jocelyn
*January 12, 2011*

**Math**

In a right triangle, if the median from the right angle to the hypotenuse is 5 in. what is the length of the hypotenuse?
*January 11, 2011*

**9th grade alegbra**

u^2-8=7u
*January 11, 2011*

**PreCalc**

That does not seem right to me because when i graph it, they turn out different.
*January 10, 2011*

**PreCalc**

Write the following expression as one logarithm: 2logx-log4-log3+logx. Simplify your answer.
*January 10, 2011*

**Math**

Make into one log function: 2logx-log4-log3+logx
*January 10, 2011*

**Math**

Make into one log function: 2logx-log4-log3+logx
*January 10, 2011*

**Pre-Calc**

Make into one log function: 2logx-log4-log3+logx
*January 10, 2011*

**math**

Make into one log function: 2logx-log4-log3+logx
*January 10, 2011*

**Physics**

An alpha particle (mass=6.68x10^-27kg)is emitted from a radioactive nucleus with an energy of 5.00MeV. How fast is the alpha particle moving in m/s? (1 MeV= 1.6x10^-13J). I dont know how to start to solve this problem A.2.40x10^7 m/s B.1.55x10^7 m/s C.3.70x10^6 m/s D.1.85x10^6...
*January 10, 2011*

**math**

a cab charges the following fare for ea. trip...first 1/4 mi $2.95 for every additional 1/4 mi or part $0.65 (a)what is the fare for a distance of 1 5/8 mi? my answer...I got $8.85 (b) what is the fare for a didtance of 10 3/4 mi? My answer...$30.25 (c)what is the possible ...
*January 9, 2011*

**physics**

if the length of a pendulum is 0.8m what is the period if the angular deflection is 30 degrees?
*January 9, 2011*

**physics**

a motorist runs out of gas and must push his 3000kg car across a flat road 200m to the gas station. ignoring friction how much work must be done in order to get the car to the gas pump? if the motorist accomplishes this in 10 minutes, how much power has he applied? what if the...
*January 8, 2011*

**science**

find a chart to help with blood types and rh. allele combinations
*January 6, 2011*

**lgrammer**

can you give me an example of a sentence with subject pronoun, action verb, adverb phrase, verb, subordinating conjunction, adverb, linking verb, subject, infinitive phrase?
*January 6, 2011*

**math**

f by 5ftind area of shaded rectangle to nrarest tenth. rectangle has circle in middle. the shaded area is 3ft
*January 5, 2011*

**Physics**

A 0.40-kg ball, attached to the end of a horizontal cord, is rotated in a circle of radius 1.3 m on a frictionless surface. If the cord will break when the tension in it exceeds 60 N, what is the maximum speed the ball can have? How would your answer be affected if there were ...
*December 24, 2010*

**acc 225**

An antique store has one employee who is given cash and sent to garage sales each weekend. The employee pays cash for any merchandise acquired that the antique store resells.
*December 19, 2010*

**Calculus AB**

A police car is chasing a suspect. The policemen is at point y=0.6 (north of an intersection) and the suspect is at point x=0.8 (east of the intersection). The police car is traveling at 60mph. Their radar gun reads that the suspect's car is getting away at a rate of 20mph...
*December 16, 2010*

**5th grade**

what is the magnitude estimate for 78.6 divided by 6
*December 16, 2010*

**algebra**

what did the beaver say to the tree? using only these letters egatkwolifunydcsmb. you may use these letters more than once
*December 14, 2010*

**science**

the temperture in which all motion of particles stop
*December 13, 2010*

**5th grade**

$12
*December 13, 2010*

**Algebra-Did I even begin correctly? **

Thank you
*December 13, 2010*

**Algebra-Mathmate, Reiny or Dr. Bob-please double check-Did I even begin correctly? **

Please check the above problem-Thank you
*December 13, 2010*

**Algebra-Did I even begin correctly? **

would 27/3^2 = 3 then in the equation so I would write it as log(6)3 Thanks for trying to help-I appreciate it-maybe I can repost for mathmate or Dr. Bob or Reiny
*December 13, 2010*

**Algebra-Did I even begin correctly? **

How would I write log(6)27-2log(6)3 as a single logarithm Would I start by getting rid of the (-2)- I know its the same log6 but what would I do with the 27 and the 3 I'm really confused on this one and I have to solve several similar ones with no clue on how to it-I'...
*December 13, 2010*

**Algebra II**

How would I write log(6)27-2log(6)3 as a single logarithm I'm confused on this one Thanks for any help you can provide
*December 13, 2010*

**geometry**

Given a circle with the radius of 2, which is the degree measure of an arc whose length is 1/2 pi?
*December 10, 2010*