Wednesday

July 29, 2015

July 29, 2015

Total # Posts: 742

**Honors Chemistry**

Due to the screening effect, the 3s electrons of magnesium (Mg) feel an effective nuclear charge (Zeff) of: 1. +1 2. +2 3. −2 4. +12 5. +4
*September 15, 2010*

**physics**

PLEASE HELP !!!!!!Find the acceleration reached by each of the two objects shown in figure below if the coefficient of kinetic friction between the 7.00 kg object and the plane is 0.250. img411.imageshack.us/img411/5841/p449.gif I keep getting 3.9=a
*September 13, 2010*

**physics**

You are trying to slide a refrigerator across a horizontal floor. The mass of the refrigerator is 199 kg, and you need to exert a force of 343 N to make it just begin to move. (a) What is the coefficient of static friction between the floor and the refrigerator? F=(mu)m*g 343\...
*September 9, 2010*

**physics**

A certain car is capable of accelerating at a rate of +0.60 m/s2. How long does it take for this car to go from a speed of 20 mi/h to a speed of 65 mi/h?
*September 8, 2010*

**calculus**

Oh, right . I forgot all about the -1. Thanks.
*September 7, 2010*

**calculus**

The sum from 0 to infinity of (-1)^n(3/3^n) is convergent or divergent? If convergent, what is the sum? I got that it's convergent and the sum is 9/2, but that's wrong.
*September 7, 2010*

**algebra**

Are the following true or false? 1. The difference of two natural numbers is always a natural number. 2. The sum of two natural numbers is always a natural number. 3. The quotient of two natural numbers is always a natural number. 4. The difference of two natural numbers is ...
*September 7, 2010*

**calculus**

Determine whether the sum from n=1 to infinity of arctan(2n^2/(25n+1)) converges or diverges. If it converges, what is the sum?
*September 7, 2010*

**Chemistry**

8.4cm = m 1333.8g=kg 119cm=mm 2391mL=L 3.22Mm=km 4.68fs=ps 8.86*10^11=Gm 1.57*10^-10m=picometers 381cm=in 94mm=in 5.0L=q 132kg=lbs
*September 6, 2010*

**physics**

A car is traveling at 28 m/s when the driver spots a large pothole in the road a distance 37 m ahead. She immediately applies her brakes. If her acceleration is -7.8 m/s2, does she manage to stop before reaching the pothole? What is this stopping distance?
*September 6, 2010*

**chemistry**

Nevermind I figured it out myself.
*September 3, 2010*

**chemistry**

Out of these choices what would you say? 1. The same number of electrons would be emitted, but they would have a lower velocity 2. The same number of electrons would be emitted, but they would have a higher velocity 3. No electrons would be emitted from the surface. 4. More ...
*September 3, 2010*

**chemistry**

We conduct an experiment by shining 500 nm light on potassium metal. This causes electrons to be emitted from the surface via the photoelectric effect. Now we change our source light to 450 nm at the same intensity level. Which of the following is the result from the 450 nm ...
*September 3, 2010*

**Biology**

What is the name given to the types of organisms that exclusively use aerobic cellular respiration to break down glucuse to produce ATP for energy? Provide three specific examples
*August 31, 2010*

**Math**

need help in identifying the y intercept for 2y+5=-2. my ordered pairs are (0,4) and (6,-2). I am visually impaired when it come to trying to see the tics. Thanks Bill
*August 28, 2010*

**english**

1. c 2.d 3.c 4.c 5.c 6.b 7.d 8.c 9.a 10.b
*August 20, 2010*

**MATH**

HOW LONG WILL IT TAKE A CAR BEING DRIVEN AT A SPEED OF 15 MILES PER HOUR TO TRAVEL 26,400 FEET? AN OBJECT MOVING AT A RATE 0F 15 MILES PER HOUR TRAVELS 22 FEET IN ONE SECOND.
*August 18, 2010*

**MATH**

How much larger than 327 is 609?
*August 18, 2010*

**MATH**

THE ANSWER IS 8,000,000,002
*August 18, 2010*

**MATH**

WRITE IN DIGITS EIGHT BILLION TWO.ANSWER SHOULD BE 8,200,000,000
*August 18, 2010*

**math**

When a ball is thrown up into the air, it makes the shape of a parabola. The equation S= -16t^2 + v*t + k gives the height of the ball at any time, t in seconds, where “v” is the init
*August 11, 2010*

**Physics**

Charge A and charge B are 2.00 m apart, and charge A is +3.90 C and charge B is +4.00 C. Charge C is located between them at a certain point and the force on charge C is zero. How far from charge A is charge C?
*July 16, 2010*

**Business**

Let us adopt the following symbols for the variables: · Sales: S ($) · Salesperson's level of education: E (Years of education). · Gender (M): We use a single dummy variable for two categories. If the observation is male, then the variable M=1, if ...
*June 21, 2010*

**physics**

Two masses are hanging over a frictionless, massless pulley as shown blocks_pulley_aMass m1 is 5.0 kg and mass m2 is 7.0 kg
*June 19, 2010*

**History**

but it wasnt a test.. its a chapter review i was trying to make it sound urgent so id get help
*June 7, 2010*

**History**

Why did president hoover's emphasis on voluntarism fail to resolve the problems of the great depression of the united states?
*June 7, 2010*

**math**

1. In a survey of a TriDelta chapter with 46 members, 13 were taking mathematics, 33 were taking English, and 6 were taking both. How many were not taking either of these subjects?
*May 21, 2010*

**Algebra**

f(x) = (x - 3)2, with domain [3, ∞) What is the range of function f?
*May 19, 2010*

**Algebra**

If f(x) = - 2x2 + 2x - 3, what is f(5)?
*May 19, 2010*

**algebra**

The radius of a large pizza is two times plus 3 inches larger than a small pizza. The area of the small pizza is 33 square inches less than the large pizza. What is the radius of the larger pizza?
*May 19, 2010*

**math**

The heights in inches of 18 randomly selected adult males in LA are listed as: 70, 69, 72, 57, 70, 66, 69, 73, 80, 68, 71, 68, 72, 67, 58, 74, 81, 72. Display the data in a stem-and-leaf plot. 1. Find the mean. 2. Find the median. 3. Find the mode. 4. Find the range. 5. Find ...
*May 19, 2010*

**College Chemistry**

Is 50.0mL of 1.0 MHF and 50.0 mL of 1.0M NaOH a buffer solution with a pH of 3?
*May 5, 2010*

**Chemistry**

What is the pH when 0.40 g of NaOH is added to 50,0 mL of 0.10 M HCOOH? No volume change. (Ka for HCOOH - 1.8 x 10^-4.)
*May 5, 2010*

**chemistry**

Write a net equation for the reaction between aqueous solutions of NH4Cl and Na2SO3.
*April 26, 2010*

**11th grade**

flvs??
*April 22, 2010*

**Accounting**

Hanson Corp uses a process costing system. Materials are added at the start of the process. Beginning inventory for January consisted of 1,900 units (40% complete for conversion) with a cost of $15,000. 10,900 units were started and completed during January. On January 31, the...
*April 17, 2010*

**chemistry**

323K
*April 12, 2010*

**Chemistry**

y=mx+b Is slope
*April 12, 2010*

**algebra 1**

(-1,1),y=x-4
*April 11, 2010*

**chemistry**

What volume does 7.50 ´ 1020 molecules of O2 occupy at STP?
*April 11, 2010*

**chemistry**

What is the volume of 62.3 g of nitrogen gas at STP
*April 11, 2010*

**Chemistry(defintions)**

I need help on finding the definitions to these: Pressure being constant, the amount of heat in a chemical equation ___________. Randomness of particle measurement is called __________. Calories required to convert 1gm of liquid to vapor without a change in temperature ...
*April 6, 2010*

**trig**

Is the somewhere where I could learn how to graph polar coordinates such as (1,pi/3)?
*March 22, 2010*

**Algebra 3**

sin(180 + 0)
*March 19, 2010*

**Math**

Given:a and b are first-quadrant angles, sin a = 5/13 , and cos b = 3/5 , evaluate sin(a - b).
*March 19, 2010*

**trig**

you use a polar calculator converter
*March 19, 2010*

**social studies **

in what way could putting a tariff on foriegn shoe imports result in a disadvantage to the untited states economy or to the United states consumers.
*March 10, 2010*

**Calculus**

Determine the convergence or divergence: An=(-1)^n(n/(n+1))
*March 9, 2010*

**trigonometry**

2. two look out situations, which are 25 miles apart along the coast on a north-south shoreline, spot an approaching yacht. One lookout station measures the direction to the yacht at N33 degrees E, and the other station measures the direction of the yacht at S62 degrees E. ...
*March 8, 2010*

**logic**

3. Translate the following argument into symbolic for, and determine whether it's logically correct by constructing a truth table. -If the team wins, then the team remains in the playoffs. If the team stays in the playoffs, then the championship is within reach. Therefore...
*March 8, 2010*

**math**

A projectile is fired directly upward with a muzzle velocity of 860 feet per second from a height of 7 feet above the ground. a. Determine a function for the height of the projectile t seconds after it’s released. b. How long does it take the projectile to reach of height...
*March 7, 2010*

**math**

Determine whether the following argument is correct. If it’s not correct, explain what is wrong with the argument and change the minor premise to make a correct argument. If a triangle is equilateral, then it has three equal sides. Triangle ABC doesn’t have three ...
*March 7, 2010*

**math**

The Fibonacci sequence of numbers begins 1,1,2,3,5,8,13,21,34,55,…and continues by the rule: every number is the sum of the two previous numbers. a. Determine the next five (eleventh through fifteenth) elements of this sequence. b. Compute the ratio of the fourteenth and ...
*March 7, 2010*

**physics**

A T-bar tow is planned in a new ski area. At any one time, it will be required, to pull a maximum of 80 skiers up a 600-m slope inclined at 15 degrees above the horizontal at a speed of 2.5 m/s. The coefficient of kinetic friction between teh skiers skis and the snow is ...
*March 4, 2010*

**physics**

You are designing a game for small children and want to see if the ball’s maximum speed is sufficient to require the use of goggles. In your game, a 15.0-g ball is to be shot from a spring gun whose spring has a force constant of 600 N/m. The spring will be compressed 5....
*March 4, 2010*

**physics**

is the answer 439040000W ?
*March 4, 2010*

**enlish**

how would I use the word turbid in a sentence
*February 16, 2010*

**chemistry**

stuck at step 5! help please!
*February 15, 2010*

**math**

Evalute: -1/3+2/3(1/2-1/3) what are the steps involved with this problem? thanks
*January 27, 2010*

**Literary Analysis and Composition**

These questions are from K12 Online school.
*January 21, 2010*

**Chemistry**

17.7
*January 19, 2010*

**english**

hi what does the alliteration in the first line of this poem represent In The Gallery Here neither nymph nor naiad ever bathed nor Saint refreshed herself in pristine water, here, in The Gallery, between Tie Rack, Camera Shop, B. Dalton, Radio Shack, Dad's Pizzas, Message ...
*January 18, 2010*

**english**

hi can someone pleases help me analyze this poem. I need a lot of help In The Gallery Here neither nymph nor naiad ever bathed nor Saint refreshed herself in pristine water, here, in The Gallery, between Tie Rack, Camera Shop, B. Dalton, Radio Shack, Dad's Pizzas, Message ...
*January 18, 2010*

**english**

i really dont know please please help me
*January 17, 2010*

**english**

hi can someone pleases help me analyze this poem. I need a lot of help In The Gallery Here neither nymph nor naiad ever bathed nor Saint refreshed herself in pristine water, here, in The Gallery, between Tie Rack, Camera Shop, B. Dalton, Radio Shack, Dad's Pizzas, Message ...
*January 17, 2010*

**government**

in the book of social studies why did the people fought for better working condition
*January 13, 2010*

**finance**

Wheeler Corporation is planning to expand its business and needs $30,000,000. The company believes that a 12-year term loan can be negotiated with a bank at an annual rate of 10%. Alternatively, an investment banking firm has indicated that it is willing to underwrite a common...
*January 9, 2010*

**Posted several times know one gets A**

Kinetics Challenge Problem Consider the following reaction: CH3X + Y → CH3Y + X At 25oC, the following two experiments were run, yielding the following data: Experiment 1 : [Y]0 = 3.0 M [CH3X] Time(hr) 7.08 x 10-3M 1.0 4.52 x 10-3M 1.5 2.23 x 10-3M 2.3 4.76 x 10-4M 4.0 8...
*January 8, 2010*

**Please help this is due Chemistry Ap**

Kinetics Challenge Problem Consider the following reaction: CH3X + Y → CH3Y + X At 25oC, the following two experiments were run, yielding the following data: Experiment 1 : [Y]0 = 3.0 M [CH3X] Time(hr) 7.08 x 10-3M 1.0 4.52 x 10-3M 1.5 2.23 x 10-3M 2.3 4.76 x 10-4M 4.0 8...
*January 7, 2010*

**Impossible chemistry problem**

Kinetics Challenge Problem Consider the following reaction: CH3X + Y → CH3Y + X At 25oC, the following two experiments were run, yielding the following data: Experiment 1 : [Y]0 = 3.0 M [CH3X] Time(hr) 7.08 x 10-3M 1.0 4.52 x 10-3M 1.5 2.23 x 10-3M 2.3 4.76 x 10-4M 4.0 8...
*January 7, 2010*

**Chemistry hard problem**

Kinetics Challenge Problem Consider the following reaction: CH3X + Y → CH3Y + X At 25oC, the following two experiments were run, yielding the following data: Experiment 1 : [Y]0 = 3.0 M [CH3X] Time(hr) 7.08 x 10-3M 1.0 4.52 x 10-3M 1.5 2.23 x 10-3M 2.3 4.76 x 10-4M 4.0 8...
*January 7, 2010*

**HIS125**

The political changes that are faced by city culture is when political funding for housing and food that aid people in lower income is cut and the area is considered poverty level
*January 6, 2010*

**college**

a 200 L electric water heater uses 15 kW of electric power. If the herter is 90% efficient, how long does it take to heat the water in the tank from 16 C to 61 C?
*December 17, 2009*

**math**

make up a list of 7 numbers having the following landmarks: mode: 21, median: 24, maximum: 35, range: 20
*December 13, 2009*

**math**

Explain why the scratch arithmetic algorithm works.
*December 13, 2009*

**Math**

Explain whether the set (0,1,2) is closed with respect to additon on whole numbers
*December 13, 2009*

**social studies **

We had our picnic near the capital of this new nation, which used to be the eastern part of Czechoslovakia..
*December 11, 2009*

**math**

5+7=12
*December 7, 2009*

**5th grade**

check out refrence book i had the same problem
*November 22, 2009*

**free casino games**

none
*November 21, 2009*

**math**

write an equation that satisifies the given conditions: perpendicular to y=-3x+7 through (3,5)
*November 19, 2009*

**Physics**

Need help ASAP for this one, really hard. to Assignment 11Problem 13.26 Tuning Forks in Neurology Tuning forks are used in the diagnosis of nervous afflictions known as large-fiber polyneuropathies, which are often manifested in the form of reduced sensitivity to vibrations. ...
*November 19, 2009*

**Calculus**

Thank you so much.
*November 10, 2009*

**Calculus**

The temperature of a cup of Starbucks coffee at time t (in minutes) is T(t)= 70 + c e^(-kt) . Initially, the temperature of the coffee was 200 degrees F. Three minutes later, it was 180 degrees. When will the temperature of the coffee be 150 degrees F? The back of the book ...
*November 10, 2009*

**Physics**

When land ice on Antarctica melts and flows into the sea, eventually it circulates and therefore distributes uniformly over the earth's oceans. As a result, does the earth's rotational speed increase, decrease or remain unaffected? (If it does have an effect, how does ...
*October 26, 2009*

**Physics**

You are a passenger on a jetliner that is flying at a constant velocity. You get up from you seat and walk toward the front of the plane. As, a result, your forward momentum increases. What (if anything) happens to the forward momentum of the plane?
*October 26, 2009*

**Physics**

A baseball player hits a home run that just barely clears the 12m high fence in right field, 94m from home plate. If the ball was at a height of 1m when hit, and its initial path after it left the bat was at an angle of 35 degrees above the horizontal, what was the ball's ...
*October 19, 2009*

**Physics**

A soccer player kicks a ball from the ground into the goal, which is located 17 meters away on the level playing field. The ball leaves the ground at an initial speed of 18m/s and at an initial angle above the horizontal of 23 degrees. Find the angle of the ball's velocity...
*October 19, 2009*

**Physics**

A projectile is launched with an initial velocity of 268 m/s, at an angle of 45 degrees above the horizontal. At a certain point, A, in its motion, its velocity angle is 17 degrees above the horizontal. At another point, B, later in its motion, its velocity angle is 30 degrees...
*October 19, 2009*

**Physics**

A baseball player hits a home run that just barely clears the 12m high fence in right field, 94m from home plate. If the ball was at a height of 1m when hit, and its initial path after it left the bat was at an angle of 35 degrees above the horizontal, what was the ball's ...
*October 19, 2009*

**Physics**

You lose your footing and slide of of your roof. Fortunately, you have placed a safety net whose center is positioned at a horizontal distance of 4.15m, measured from a point directly below the edge of the roof- and indeed you land in the center of the net. If the roof slopes ...
*October 19, 2009*

**albgrea**

my sister is 14 years older than i am. the sum of our ages is 50. find our ages
*October 15, 2009*

**Physics**

You're lying on a beach. Some distance away, across level ground, is a tall coconut palm. As you watch, a monkey in that tree drops a coconut (from rest) onto hard ground below. The time elapsed from the moment he releases the coconut until it hits the pavement is three ...
*October 12, 2009*

**physics**

Two persons start at the same place and walk around a circular lake in opposite directions. One has an angular speed of (1.40 x 10^-3) rad/sec. The other has an angular speed of (3.70 x 10^-3) rad/sec. How long (how much time) will it be before they meet?
*October 12, 2009*

**Physics**

A stone, initially at rest, is dropped from the top of a building. On its way down, it passes a window that is 2.52m tall. It takes 0.134 seconds to pass the window. From how far above the top of the window was the stone dropped?
*October 12, 2009*

**amer gov**

Choose the poll results for your state. Research and take notes on the polls and the data provided. Then, write down ten results from the polls that indicate something interesting about the relative strength of the parties.
*October 11, 2009*

**Physics**

A disc of radius 50.0cm is rotating at 120 rpm, and its angular acceleration is 3.00 rad/s^2. Find the magnitudes of the velocity, v, and tangential acceleration, a, of its outer edge.
*October 9, 2009*

**Math**

Solve this system of simultaneous equations in order to express V in terms of Vo, x, and a (but not t). x=Vot+(1/2)at^2 v=Vo+at
*October 5, 2009*

**Math**

Solve for t: y=vt+(1/2)gt^2
*October 5, 2009*