Friday

December 9, 2016
Total # Posts: 3,230

**science**

I need help planning a space trip

*December 8, 2016*

**Physics**

Tarzan swings on a 33.0 m long vine initially inclined at an angle of 31.0? with the vertical. The acceleration of gravity if 9.81 m/s What is his speed at the bottom of the swing if he a) starts from rest? Answer in units of m/s b) pushes off with a speed of 5.00 m/s? Answer ...

*December 7, 2016*

**Physics**

Just as no mechanical device can be 100% efficient, no heat engine can transfer 100% of its heat to a single object. Some of the heat energy must be wasted (released into the environment). We have a heat engine that produces 150 J of heat, does 40 J of work, and emits 110 J ...

*December 7, 2016*

**math**

beth is decorating 24 cards. she decorated 1/3 of the cards on thursday and 1/2 of the cards on friday. What part of the cards does beth still need to decorate? 24 divide by 1/3 is 8 cards on thursday, 24-8=16 remaining cards 16 divide 1/2 is 8 cards on friday, 16-8=8 cards ...

*December 6, 2016*

**Math**

how to write 2 20/500 less than the quotient of x + 2 is equal to the sum of 3 6/10 and quadruple x

*December 1, 2016*

**Interest**

You deposit $4000 in an account earning 5% interest compounded monthly. How much will you have in the account in 5 years? Use n=12 for monthly compounding,n=4 for quarterly compounding,n=2 for semiannual compounding, and n=1 for annual compounding.)

*December 1, 2016*

**Portions and integers **

I need help please. Mercury is a metal that is liquid at room temperature. Its melting point of -39 degrees Celsius. The melting point of isopropyl alcohol is -89 Celsius. (Part A) In the context of this problem, what does zero mean ? (I think it just tells if the liquid will ...

*November 30, 2016*

**Absolute value statement**

Thank you David so it is |0-7|=|-7|=-7

*November 29, 2016*

**Absolute value statement **

This is part b:can someone help me of I'm doing this right. Mr. Wizard started at zero and jump to left 7 feet. Auntie long legs started at zero and John to right 5 feet. Wright an absolute value statement that shows the distance that each frog ended up from zero. Which ...

*November 29, 2016*

**Inequality 6 grade math help**

Am I doing this right? Mr. Wizard started at zero and jump to left 7 feet. Auntie long legs started at zero and John to right 5 feet which frog was ahead? Write an inequality statement (using < or >) to compare the values of their lending points. 7 <0 < 5 Aunts ...

*November 29, 2016*

**6 grade math area perimeter**

I want to make sure this one is ok. I know the area now I need perimeter. It's a long line it's a 1× 6 and on top in the middle is another box 1×2 shape the area I got was 8 sq.units. I think perimeter is 15units. Is this right

*November 27, 2016*

**6 grade math area perimeter**

Thank you

*November 27, 2016*

**6 grade math area perimeter**

I found the area but I need help on perimeter. The shape in form of letter L. The long is a 1×4 and the box on top is a 1×1. THE AREA IS 5 sq.units I think perimeter is 12 is this right

*November 27, 2016*

**Chemistry**

A 2.00L flask was filled with 4.00 mol of HI at a certain temperature and given sufficient time to react. At equilibrium the concentration of H2 was 0.400 M. Find the equilibrium concentrations of I2 and HI and then find the Keq at this temperature 2HI(g) <-> H2(g) + I2(g)

*November 23, 2016*

**Math**

1) A ladder that is 15m long is leaning up against a building. The ladder makes an angle of 30 degrees with the ground. a) Find an exact expression for the height at which the top of the ladder contacts the wall of the building. 2) A tree is anchored by a guy wire that is ...

*November 22, 2016*

**Math**

the jetstream is a strong wind current that flows across the united states. flying with the jetstream, a plane flew 3,000 miles in 5 hours. Against the same wind, the trip took 6 hours. Find the airspeed of the plane (the speed in still water). My answer: X=550 miles per hour

*November 22, 2016*

**Math**

In a math class 70 students received an A on the third test, which is 175% of the students who received an A on the second test. How many students received an A on the second test

*November 20, 2016*

**History**

Hey I need to know how the government controls oil. Can you help me? It would be huuuuuge help! thx =)

*November 18, 2016*

**Philosophy**

Section I: Answer the questions below about this brief passage: During the nineteenth century, many women died from what was then called “childbed fever”. A Viennese physician, Ignaz Semmelweis, concluded (diagnosed) that the cause of this disease was a “germ&#...

*November 17, 2016*

**6 grade math **

Please I just need help on the set up teacher wants a guess and check table. Thomas is thinking of a number. If he doubles his number and subtraction 27, the results is 407. Of what number is Thomas thinking?

*November 16, 2016*

**6 grade math **

Please I need help on just the set up using a guess and check table. Karina has some dimes and quarters she has 8 more dimes and quarters and the collection of coins is worth $7.45. How many dimes and quarters does Corona have?

*November 16, 2016*

**6 grade math **

I need help in the setup teacher wants a guess and check table for the word problem. Just the set up I need help on . Please a wood board 156 cm long is cut into three pieces.the two longer pieces are the same length and are 15 cm longer than the shortest piece. How long are ...

*November 16, 2016*

**Math**

It makes sense thank you!

*November 12, 2016*

**Math**

Kerri's father bill was a baker. Out of his usual morning batch of cookies bill burned the first 2 dozen cookies. He gave half of what was left to Keri to take to school. He wrapped up half of the remaining cookies and have them to a group of fireman. He gave two thirds of...

*November 12, 2016*

**Math 6 grade - question for Ms sue**

Thank you i have what you wrote but that means there is only one way ? , copy the web below. Since it is a web that shows the connections between all the different ways a portion can be represented, its technical name is “Representations of a Portion web.” After ...

*November 8, 2016*

**Math 6 grade**

I just want to know if someone can help me understand what is it asking.if I have to show different as different ways of fractions and decimals to come up to 15% or just one method of 15%. copy the web below. Since it is a web that shows the connections between all the ...

*November 8, 2016*

**English**

I want to get clarification and on how to start my research, what steps to take with my topic. So far, I want to do Native American Culture. But how can I make this family diversity assignment? This is what I have to do: I have to do poster presentation on Family Diversity. ...

*November 8, 2016*

**Physics**

Two hockey pucks of equal mass are involved in a perfectly elastic, glancing collision, as shown in the figure below. The orange puck is initially moving to the right at voi = 3.95 m/s, when it strikes the initially stationary blue puck, and moves off in a direction that makes...

*November 6, 2016*

**Calculus**

A particle moves along the x-axis and its position for time t is greater than or equal to 0, is s (t)=cos(2t)+sec(t). When t=pi, the acceleration of the particle is

*November 6, 2016*

**math**

To qualify for a special program at university, sharma had to write a standardized test. The test had a maximum score of 750, with a mean score of 540 and a standard deviation of 70. Scores on this test were normally distributed. Only those applicants scoring above the third ...

*November 5, 2016*

**Chemistry**

A compressed air tank carried by scuba divers has a volume of 9.5 L and a pressure of 140 atm at 20?C. If the gas was instead in a cylinder with a floating, massless, frictionless piston, what would the volume of the gas be (in liters) at STP? Express the volume in liters to ...

*November 5, 2016*

**Chemistry**

When a 3.80 g sample of magnesium nitride (MW 101g/mol) is reacted with 3.30 g of water, 3.60 g of MgO is formed. What is the percent yield of this reaction? Mg3N2 + 3 H2O --> 2 NH3 + 3 MgO

*November 2, 2016*

**AP Chemistry Help!**

I had to conduct an experiment to find the enthalpy of reaction for : 4Fe + 3O2 + 6H2O ----> 4Fe(OH)3 In the experiment , I started with an inital temperature of 22.3 C and edned with 36.7 C so the delta T is +14.4C. Now it's telling me to calcualte the delta Hrxn for ...

*November 1, 2016*

**Physics**

The block of mass 2.13615 kg has an acceler- ation of 3.7 m/s2 as shown. What is the magnitude of F? Assume the acceleration due to gravity is 9.8 m/s2 and the surface is frictionless. Answer in units of N.

*October 27, 2016*

**physics**

A child with a mass of 17 kg sits at a distance of 1 m from the pivot point of a seesaw. Where should a 15 kg child sit to balance the seesaw?

*October 27, 2016*

**physics**

Damon thanks for the push! The answer is number 2...:)

*October 27, 2016*

**physics**

The work that a force does by acting on an object is equal to what? 1) the product of force (in the direction of motion) and distance and is negative if the force and motion are in the same direction 2) the product of force (in the direction of motion) and distance and is ...

*October 27, 2016*

**Math **

Just by reading the steps I am lost please if someone can help me i am studying for a quizz on Friday but I want to undestand . All I understand is the meaning I can see any expression multiplied by 1 is equivalent to original expression but I am lost with these questions. ...

*October 26, 2016*

**Math **

Ok I am lost I need help. Describe how you can use a generic rectangle to multiply two numbers. Give an example. I'm just thinking of 22×35

*October 20, 2016*

**English**

Please help to understand this assignment. Like sections, introduction and subheadings. Ideas. How should I start with the subheadings/sections? First introduction and overview? Thank you! Building Communities: Do a situational analysis of the police department in the city ...

*October 20, 2016*

**Math Question**

Answer is c 8,000 machine I

*October 17, 2016*

**Math**

Sorry I ment 67.50 each

*October 17, 2016*

**Math**

$67.25each 60 for each ticket+5 (per ticket)+ $2.50 (each 4/$10)

*October 17, 2016*

**Physics**

Josh is standing on the roof of the school 12 meters directly above James who kicks a soccer ball straight up with an initial velocity of 15 m/s. If Josh catches the ball on the way up, how long will the ball take to reach him? If he misses it on the way up and catches it on ...

*October 11, 2016*

**Physics**

Suppose Jessica drops a rock from a hot air balloon 200m above the water. how long does it take the rock to fall (a) the first 100 meters and (b) the second 100 meters?

*October 11, 2016*

**math**

Jake filled his 50 gallon bathtub in 5 minutes. How fast was the water flowing?

*October 11, 2016*

**physics**

An 76 kg satellite orbits a distant planet with a radius of 4500 km and a period of 280 min. From the radius and period, you calculate the satellite's acceleration to be 0.63 m/s2. What is the gravitational force on the satellite?

*October 9, 2016*

**math**

Assume ang interes rate of 5% compounded semiannually ang 20 semiannual payments to settle the loan

*October 9, 2016*

**physics**

What changed Newton's original work on the movement of the Moon around the Earth into the law of universal gravitation? 1) his conclusion that the same laws applied to all objects, no matter how small 2) his connection of gravitation to his first law 3) his connection of ...

*October 8, 2016*

**physics**

Never mind Scott, I see my mistake. I forgot to do the last step ( multiply). Thank you for your help!

*October 8, 2016*

**physics**

Scott, that is the answer that I came up with and I got it wrong.

*October 8, 2016*

**physics**

Two spacecraft in outer space attract each other with a force of 4 N. What would the attractive force be if they were one-eighth as far apart?

*October 8, 2016*

**Physics**

Two blocks of masses 11 kg and 8.0 kg are connected together by a light red string and rest on a frictionless level surface. Attached to the 8-kg mass is a light blue string, which a person uses to pull both blocks horizontally. If the two-block system accelerates at 0.5 m/s2...

*October 3, 2016*

**Chemistry**

Identify the oxidation-reduction reactions among the following: 1. Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s) 2. 2Na(s) + Cl2(aq) → 2NaCl(s) 3. 2Mg(s) + O2(g) → 2MgO 1 and 2 only 2 and 3 only 1 and 3 only All of 1, 2, and 3 None of 1, 2, and 3

*October 2, 2016*

**Physics **

Please help..... When something is thrown over a large distance (on earth ) what new factor comes into play? 1- The decrease in gravity over long distance 2- The increase in gravity over long distance 3- The tendency of thrown objects to fall to the ground 4- The difference ...

*October 1, 2016*

**algebra**

A candidate for public office has claimed that 60% of voters will vote for her. If 5 registered voters were sampled, 1. What is the probability distribution function for this voting? 2. What is the probability that exactly 3 would say they favor this candidate? 3. Calculate ...

*September 26, 2016*

**algebra**

candidate for public office has claimed that 60% of voters will vote for her. If 5 registered voters were sampled,

*September 26, 2016*

**American Government**

Has anyone taken this test? Please help!!!!

*September 21, 2016*

**American Government**

12. Read this excerpt from the U.S Constitution. To declare War, grant Letters of Marque and Reprisal, and make Rules concerning Captures on Land and Water; To raise and support Armies, but no Appropriation of Money to that Use shall be for a longer Term than two years; -...

*September 21, 2016*

**Math**

Find the percent change. Round to the nearest percent. 215 1/2 lb to 133 1/4 lb $315.99 to $499.89

*September 19, 2016*

**American Government**

Thanks!

*September 19, 2016*

**American Government**

1. Thomas Hobbes and John Locke were European philosophers who influenced American founding documents with which theory? A. social contract theory B. divine right of kings theory C. no taxation without representation theory D. equal pay for equal work theory

*September 19, 2016*

**Biology**

Oh, I forgot to add that. :D My answers are D,C, and B.

*September 19, 2016*

**Biology**

I would like some help if that is OK, like soon!:) 1.) A group of scientists proposes an idea that a chemical compound will enable bean plants to grow faster. They grow one group of bean plants in the presence of the compound and another group in the absence of the compound. ...

*September 19, 2016*

**AP Chemistry**

If the pH of a nitric acid solution is 2.34, then what is the molarity of nitric acid in the solution? A. 1.6 × 10-4 M B. 3.8 × 10-3 M C. 2.2 × 10-2 M D. 4.6 × 10-3 M

*September 14, 2016*

**AP Chemistry**

What should be the range for the exponent of [H+] in solutions that are characterized as acidic? A. 0 to -0.07 B. 0 to 0.7 C. 0 to -7 D. 0 to 7

*September 14, 2016*

**ap chemistry**

What is the [H3O+] of a solution with [OH-] = 6.3 × 10-4 M? A. 6.3 × 10-18 M B. 10.80 M C. 6.3 × 10-4 M D. 1.6 × 10-11 M DrBob222 can you help me with this question please?

*September 14, 2016*

**Government**

And I just took it, and B is correct.

*September 8, 2016*

**Algebra**

Sally bought 12 tickets for a movie, an adult ticket costs $9 and a child ticket costs $5, if she spent a total of $76, how many adults and children did she buy tickets for?

*September 3, 2016*

**Math**

0.41,0.46, 0.6

*September 1, 2016*

**algebra**

for what value of x is the rational expression below equal to zero? 2-x/2+x

*August 31, 2016*

**maths**

solve the system of equations algebraically for real values of x and y { x+u=16 x^2 +y^2 =128

*August 30, 2016*

**calculus**

find the inverse of the matrix. [ 16 1 ] 1 16

*August 26, 2016*

**calculus**

Find the product [ 3 8 ] [ 4 5 ] 6 3 4 4

*August 26, 2016*

**calculus**

Find A - B A = [ 3 7 8 ] 7 9 3 7 9 9 B = [ 2 2 6 ] 6 7 8 5 8 6

*August 26, 2016*

**math**

if a patient walked 1/4 mile sun, 1/3 mile mon, 1/2mile tues, 7/12 mile wed, 3/4 mile thurs, 5/6 mile fri, and 1 fll mile sat, how many miles did the patient walk in a week?

*August 24, 2016*

**Social Studies**

Yea, Fred's answers are correct.

*August 22, 2016*

**Social Studies**

2 3 4 5

*August 19, 2016*

**Math **

Find an A.P. such that the sum of the first three terms is one half the sum of the next four terms, the first term being 12.

*August 18, 2016*

**Chemistry**

Determine the cell potential from the following half cells: Pb^o/Pb2+ and ZN^O/Zn2+ whre [Pb2+]=.86Mand [Zn2+]=0.35M Calculate K for this reaction. How long in hours would you have to let it go until you lower the voltage to 95 percent of the E from the Nernst equation at 7.2?

*August 14, 2016*

**pre cal**

The vector u = 94300, 5200) gives the number of units of two models of laptops produced by a company. The vector v = (1800, 1200) gives the price in dollars of the two models of laptops, respectively. Identify the vector operation used to increase revenue by 5%

*July 16, 2016*

**Pre Calculus**

The number of new accounts opened at a credit union in the years 2001 to 2006 can be approximated by the model N(t)= -80.6t^2+2100t+12000, where 11 <= t <= 16, with t = 11 corresponding to 2001. Using this model and your graphing calculator, determine the year in which ...

*July 4, 2016*

**Math**

Let R be the region bounded by y = ln x, x-axis, and x = 3. Answer the following. a) Write, but do not solve, an integral expression that will find the volume of the solid that results from rotating R about x = -2. b) Write, but do not solve, an integral expression that will ...

*June 23, 2016*

**Calculus**

Thank you so much!

*June 23, 2016*

**Calculus**

The base of a solid is the region bounded by the lines y = 5x, y = 10, and x = 0. Answer the following. a) Find the volume if the solid has cross sections perpendicular to the y-axis that are semicircles. b) Find the volume if the solid has cross sections perpendicular to the ...

*June 23, 2016*

**Just a random question that I'm interested in.**

All right, thanks!

*June 20, 2016*

**Just a random question that I'm interested in.**

Do Kayan women enjoy wearing the neck rings? From Kayan.

*June 20, 2016*

**Math**

An object moves along the path x^2 - y^2 = 5. At the point (-3, 2),dx/dt = -4. Find dy/dt at that same point. I understand that dy/dt of the function is y' = x/y but I am not sure how to find it at that specific point. Could you please help? Thank you!

*June 18, 2016*

**College Intro To Geography **

Discuss the ways in which geographers employ the ideas of distance, accessibility, and connectivity to describe the process of spatial interaction. The spatial interaction would be how people, or even animals, interact with each other. For instance how well do we connect with ...

*June 16, 2016*

**English**

The title "another evening at the club" is close in meaning to "just another evening at the club" given the events of the story, what is the significance of this meaning? I need help explaining this. I have no idea how to word it

*June 16, 2016*

**CHEMISTRY**

If you used only photons that were dropping from the n = 6 shell to the n = 1, how many of these photons would be required to keep a 100 Watt light bulb lit for 10 minutes?

*June 13, 2016*

**Chemistry**

how do I convert 5E-26 to Meters 60mph is 26.8224m/s I am having trouble in how to write it out (9.109E-31kg)(26.8223) or am I dividing the 5E-26 from the 26.8224?

*June 13, 2016*

**Chemistry**

If you were told that a ball had a wavelength of 5 x 10-26 nm at a velocity of 60 mph, what would be the mass of that ball in pounds?

*June 13, 2016*

**Math**

A fair coin is flipped four times. What is the probability that tails occurs exactly 3 times if it is known that tails occurs at least twice?

*June 8, 2016*

**Science**

Shale often contains fossils of leaves. Question: If the gastropods listed in line 3 and line 6 were collected from shale containing leaf fossils what would their possible age be? Question: Could you use radiocarbon dating to assign a numerical date/age to this rock unit? ...

*June 6, 2016*

**Science**

I'm doing research but I can still not find it.

*June 6, 2016*

**Science**

what the definition of age range in earth science?

*June 6, 2016*

**Science**

okay, and how about this question. Why Devonian could not be considered an index fossils?

*June 6, 2016*

**Science**

how? why?

*June 6, 2016*

**Science**

I still don't understand.

*June 6, 2016*