Saturday

September 20, 2014

September 20, 2014

Total # Posts: 375

**Physics - help please!**

A 20 kg mass is at rest on a level surface where the coefficient of static friction is 0.68. a) How much force will it take to get the mass to move. b) If a horizontal applied force of 72 Newtons is acting on the mass, how much friction is acting?
*November 1, 2010*

**Chemistry**

Explain why the calculated value for the (1) enthalpy of combustion for propane using bond energies (bond breaking and bond formation)might not be in close agreement to the values calculated using (2) Hess Law and the values calculated using the (3) summation of the change in ...
*November 1, 2010*

**Chemistry**

For Carbon dioxide, for a volume of 500 mL and temperature of 100 degrees celcius, calculate the pressures using the ideal gas law and the van der Waals equation. Explain any dicrepancies in the calculated values. Ideal Gas Equation: Van Der Waals Equation Pressure: Explanation:
*November 1, 2010*

**AP Chemistry**

Which response includes all of the following LiOH, KOH, Ni(OH)2, Mg(OH)2, Ca(OH)2 that are insoluble bases, and no others?
*October 13, 2010*

**physics**

A 50 kg boy picks up a 11 kg stereo and raises it 0.75 m from the floor to a tabletop. How much work did he do on the stereo? How much work did he do to raise his own center of mass 0.40 m in the process? I'm assuming you use W=mgy equation but do you consider the weight ...
*October 9, 2010*

**4th grade english**

Stories
*October 4, 2010*

**Science**

What weather would it be when: A. a cold front is moving into an area that has warm, moist air. B. A warm front is moving into an area that has cold, dense air. C. A cool sea breeze is blowing inland, causing warm, humid air to rise. D. Air pressure is falling and the ...
*September 19, 2010*

**Chemistry 1**

I have trouble understanding ratios and relativity so I can't understand how to use atomic mass units. Here is an example from my book: How many grams of iron would contain the same number of iron atoms as the number of carbon atoms contained in 1.000 g of carbon? Solution...
*September 11, 2010*

**Verb Tense**

As I further my education, I am securring my future Net Worth. Is future the verb? Is this correct?
*July 30, 2010*

**Chemistry**

The heat of fusion for water is 80cal/g. The specific heat of liquid water is 1.00cal/g. How many calories of heat are released when 20g of water at 30 degrees is cooled to 0 degrees and frozen to ice at 0 degrees?
*July 19, 2010*

**physics**

A car with a mass of 1435 kg moves at 11 m/s. What braking force is needed to bring the car to a halt in 10 s?
*May 27, 2010*

**Math**

I'm doing homework and stuck on this question: What percent of 3 1/3 is 3?
*May 20, 2010*

**English**

On the 6 one, say this: She recommended THAT I should read the book.
*May 20, 2010*

**physics**

The charges of two identical aluminum speheres are -24uC and +4.0uC. The spheres are brought together so they simultaneously touch each other. They then seperated and placed on the X-axis. What is the net force exerted b one sphere on another after seperation?
*April 29, 2010*

**math**

i sorry...i meant to say kristen has 58 cousins... subtract 10 from 68 then make sure the total adds to 68. Disregard first response
*April 29, 2010*

**math**

kristen has 28 cousins. Subtract 10 from 58. just make sure that the total adds to 68
*April 29, 2010*

**calculus**

yes it is. Thank you very much for your help.
*April 27, 2010*

**calculus**

let f(x)=x+2/x+8. what does f^-1(-4) equal?
*April 27, 2010*

**calculus**

let f(x)=x+2/x+8. what does f^-1(-4) equal?
*April 27, 2010*

**Physics**

A particle of mass m0 is given a kinetic energy equal to one-third its rest-mass energy. How fast must the particle be traveling
*April 25, 2010*

**calculus**

what is the antiderivative of f(x)= x^4-2 sq root(X) +3/x^3
*April 25, 2010*

**Spanish**

how would you answer this question with affirmative commands and a direst object pronoun? Leo el libro de la historia de Oaxaca? Visito los museos? Compro la chaqueta? Escribo cartes? Compro el video sobre Monte Alban?
*April 18, 2010*

**Spanish**

I need to create a sentence to tell the following people's opinions. Tu / que / es aburrido(a) Yo / Que / es emocionante Nosotros/ que / es important para la ciudad. Los maetros/ que / es interesante Mi amigo(a) / que / es divertido(a)
*April 18, 2010*

**Accounting**

I need help with this problem. Could someone possibly explain to me how to prepare the journal entry for this problem? Prepare journal entries to record each of the following purchases transactions of a merchandising company. Show supporting calculations and assume a perpetual...
*April 17, 2010*

**Art**

I'm trying to find out what the differences and similarities are between: Impressionism Neoclassicism and Abstract Expressionism Examples of these arts are: The Emperor Napoleon in His Study at the Tuileries by Jacques Louis David (Impressionism) The Luncheon of the ...
*April 10, 2010*

**Social Studies**

What is a small island off the coast of Syria in the Mediterranean Sea?
*April 6, 2010*

**English**

Yes, that is true.
*April 5, 2010*

**English**

ok i got all of them except for 5. b. 11. d. 14. c. 15. a. 16. c. 18. c. 19. b. 20. d. 23. b. can you also check these answers please =]
*March 18, 2010*

**English**

5.a 6.c 11.a 12.b 14.a 15.c 16.d 17.b 18.a 19c 20.a 21.b 22.d 23c 24.a 25.b 26.d 27.c 28.d 29.c 30.a can u check these answers
*March 18, 2010*

**English**

5. Sarita's party takes place at night and all the villagers are gathered there. How do these details help make the party a good setting for the stranger to accomplish his goal? (1 point) * He can arrive and escape without people seeing him. * It will take longer for the ...
*March 18, 2010*

**computer**

Can you explain step by step how data is processed in the computer
*March 17, 2010*

**French**

I have to write the sentence "You (plural) need to make up your own mind" in french using "il faut que" and "prendre tes propres decisions." Would the result be "Il faut que vous prenniez tes propres decisions"?
*March 13, 2010*

**Physics**

If a bobsled with a total mass of 250kg, reaches the bottom of the hill at a speed of 92mph, how tall was the hill? I do not understand how to create the formula. I know that 92mph = 134.933 ft per second & that 1 mile = 5280 ft. Would I take the (92)mph x (5280) ft per mile...
*March 1, 2010*

**Physics**

If a bobsled with a total mass of 250kg, reaches the bottom of the hill at a speed of 92mph, how tall was the hill?
*March 1, 2010*

**biology**

why aren’t there vaccines for every disease?
*February 24, 2010*

**chemistry**

) Mare is preparing an experiment using 3 cups, one made of paper, one of plastic and one of glass. She plans on pouring 50 ml of hot water from a pitcher into each of the 3 cups and record the temperature in 5 minute intervals. What is the independent variable in this ...
*February 23, 2010*

**chemistry**

Mare is preparing an experiment using 3 cups, one made of paper, one of plastic and one of glass. She plans on pouring 50 ml of hot water from a pitcher into each of the 3 cups and record the temperature in 5 minute intervals. What is the independent variable in this ...
*February 23, 2010*

**physics**

Hans uses a wheelchair. Although he has a rampto in his house, he finds it difficult to get his wheelchair up the ramp. Whcih modification would make it easier for Hans to get in his house? a. increase the length of the ramp b. increase the friction between the wheels and the ...
*February 23, 2010*

**spanish**

Here is my translation -------------------------------- Let's just say I am talking of Madrid There where the roads are crossed where the sea cannot be conceived where returns always the fugitive …Let's just say I am talking of Madrid. Where the desire travels in ...
*February 8, 2010*

**spanish**

What is the meaning of this lyrics? I have translated this but I do not understand what he is talking about. The lyric meanings are abstract to me. Please help me! Pongamos que hablo de Madrid Allá donde se cruzan los caminos donde el mar no se puede concebir donde ...
*February 8, 2010*

**grammar**

B is the best choice.
*February 8, 2010*

**MLA english question**

My professor told that I can pick what to use. If you are doing in-text citations then you don't need footnotes and vice versa.
*February 8, 2010*

**computer**

All in one computer security system is good because it makes it easier to manage everything. You know that all of the antivirus,antispyware, and firewall will not conflict with one another because they made by the same company. All in one security system protects computers ...
*February 7, 2010*

**Calculus (for Business)**

Could you please show me the math behind answer a? How did you calculate the limit to get infinity?
*February 6, 2010*

**Calculus (for Business)**

Suppose a fish swimming a distance of L ft at a speed of v fit/sec relative to the water against a current flowing at the rate of u ft/sec (u<v) expends a total energy given by E(v)= (aLv^3)/(v-u) Where E is measured in foot-pounds and a is a constant. a) Evaluate the limit...
*February 6, 2010*

**history**

Dwight David Eisenhower
*February 6, 2010*

**math**

The area of a rectangle= LengthxWidth let x= the length of one side of the square garden A(x)= (x+3)(x-3)
*February 6, 2010*

**mental health**

i need to provide an example of how my own values and beliefs impact on my work with individuals experiencing mental illness
*February 5, 2010*

**Physics**

The mass of a car is 2400 kg. the constant power supplied by the engine is 60 kW and the car starts from rest. What is the speed of the car at the end of 2 seconds?
*January 24, 2010*

**math**

The mean systolic blood pressure of adult males is normally distributed with a mean of 138 (millimeters of mercury) and a standard deviation of 9.7. What percent of adult males have blood pressure between 161.28 and 164.9?
*January 22, 2010*

**math**

my daughter needs help finding a mystery number. 1)when the mystery number is divided by 3,there is a remainder of 1. but it has to be the same thing over again with 4 remainder 2 and 5 remainder 4.And there is one more what is the smallest number that could be divided by the ...
*December 14, 2009*

**College Math**

Thanks
*November 23, 2009*

**College Math**

Im having a hard time trying to figure out how to do this problem: A plane can fly 150 mph in calm air. Flying with the wind, the plane can fly 350 mi in the same amount of time it takes to fly 250 mi against the wind. Find the rate of the wind.
*November 23, 2009*

**Math**

Thanks. Thats the answer i had and the a was in the radical. so do the answer come out to be 3(Radical 3a)
*November 23, 2009*

**Physics**

I tried solving this using by drawing it out, using trig and newton's laws to calculate Fx and Fy and used these values to calculate work in x-direction and y-direction. Finally I used Workx and Workx to find overall work with pythagoras....is this correct? I got 6.21J as ...
*November 17, 2009*

**Physics**

An object is placed on an inclined plane which forms an angle B = 18º with the horizontal. An external force F of magnitude 14.3 N is applied to the object. The force F acts in a direction which forms an angle A = 62º with the horizontal. As a result of the force F, ...
*November 17, 2009*

**Physics**

Yes I see what you're saying after drawing the diagram...So for the first bit we just use plain substitution of GPE formulas and second bit is trig. =) thanks that seemed easier than i thought.
*November 17, 2009*

**Physics**

A pendulum consists of an object of mass m = 1 kg swinging on a massless string of length l = 258 cm. The object has a speed of 1.6 m/s when it passes through its lowest point. What is the greatest angle with the vertical that the string makes during the motion of the object? ...
*November 17, 2009*

**calculus**

Thanks for your help. It helped me figure out the correct answer. The second derivative is 240x^3+360x^2-1800x. From there I factored and got 120x(2x^2+3x-15)=0. then used the quadratic formula to get (-3+sqrt129)/4, (-3-sqrt129)/4, and 0.
*November 12, 2009*

**calculus**

Consider the function f(x)=12x^5+30x^4–300x^3+2. f(x) has inflection points at (reading from left to right) x=D,E, and F. where D is___, E is____, and F is____.
*November 12, 2009*

**Math**

5 doller bills and 3 dimes
*October 19, 2009*

**Spanish**

Are you sure? I was thinking the first one is era because it describes a person.
*October 18, 2009*

**Spanish**

Hi, I was wondering if you would use "era" or "fue" in these sentences: La persona que se murió más recientemente era (fue?) una mujer. El deiciocho de agosto era (fue?) la fecha que ella fue al hospital. Thanks for the help!
*October 18, 2009*

**calculus**

The slope of the tangent line to the parabola y=4x2–6x+6 at the point where x=5 is: The equation of this tangent line can be written in the form y=mx+b where m is: and where b is:
*October 16, 2009*

**math**

have a good night mathmate.
*October 14, 2009*

**math**

yeah, I was messin up on that part, but now I have the same result as you. Thanks Mathmate. LoL
*October 14, 2009*

**math**

nevermind I got it, thanks.
*October 14, 2009*

**math**

this is what I did 56 567 *11.400 00.000 000.000 2626.800 56567.000 565670.000 which all =624863.800
*October 14, 2009*

**math**

I got 624863.800.
*October 14, 2009*

**math**

I am doing long multiplication and I need help. 56 567*11.400=
*October 14, 2009*

**Science (Grade 8)**

are you asking for their formulas?
*October 14, 2009*

**Medical Physics**

A 18000kg airplane lands with a speed of 77 m/s on a stationary aircraft carrier deck that is 115 m long. Find the work done by nonconservative forces in stopping the plane. I have an exam on this tomorrow and I am confused any help would be appreciated.
*October 13, 2009*

**Physics university **

ugh confused
*October 12, 2009*

**literary **

what is tone, mood, and irony?
*October 12, 2009*

**literary **

what is foreshadowing and what is flashback?
*October 12, 2009*

**Twilight**

5,000,000
*October 12, 2009*

**Geography Hook for Presentation**

We're comparing the historical tornadoes that passed through both areas, however we're just looking for a generalized tornado hook to begin our presentation
*October 6, 2009*

**Geography Hook for Presentation**

Were doing a 5 minute presentation to the class on tornadoes comparing the Tornados in Region, to Barrie Canada. Just wondering if anyone had any creative ideas we could use to hook the class in to this topic! any suggestions would be wonderful, Thanks
*October 6, 2009*

**Physics**

Imagine a right-angle triangle with angle θ = 40o on the left. The serves as an increasing slope. On the slope is an object of mass m1= 340 g on an inclined surface. The angle of the inclined surface is θ = 40o with the horizontal. The object m1 is connected to a ...
*October 6, 2009*

**literary**

Hero
*October 1, 2009*

**calculus**

I am suposed to solve for x if the FUNCTION is equal to 5.
*September 30, 2009*

**calculus**

well it said that in the book but it wants you to solve for x IF the function is equal to 5.
*September 30, 2009*

**calculus**

The equation of the function is: f(x)=4-2(x-6)^1/3, for x not equal to 5 calculate precisely the value of f(x). so I got this: 5=4-2(x-6)^1/3 1=-2(x-6)^1/3 (-1/2)=(x-6)^1/3 (-1/2)^3=(x-6) -.125=x-6 now the next step is suposed to be this but I don't understand how they got...
*September 30, 2009*

**Social**

yes, but fiction can still be history even if it was off the top of someones head. Someone telling a story about someone else who was in a different time period. They may not have exact information from that person. But the information they useis still believable. It puts the ...
*September 29, 2009*

**Social**

Why is history better than fiction?
*September 29, 2009*

**University Physics**

A small box is held in place against a rough vertical wall by someone pushing on it with a force directed upward at 28degrees above the horizontal. The coefficients of static and kinetic friction between the box and wall are 0.40 and 0.30, respectively. The box slides down ...
*September 28, 2009*

**Physics but algebra problem**

Thanks so much!!!!
*September 23, 2009*

**Physics but algebra problem**

Where i am having a problem to....Do you have same prob James? Acceleration is stumping me.
*September 23, 2009*

**Physics but algebra problem**

I'm not sure how to do the algebra the m in the denominator is confusing me. 0_0 so sorry i'm so difficult i feel stupid. not sure how to solve for m.
*September 23, 2009*

**Physics but algebra problem**

huh?? 260,000 Newtons?
*September 23, 2009*

**Physics but algebra problem**

Prob is I not sure exactly how to do the algebra when I plug in the a. and doesn't the m just cancel out? 0_0
*September 23, 2009*

**Physics but algebra problem**

When you lift a bowling ball with a force of 89 , the ball accelerates upward with an acceleration . If you lift with a force of 99 , the ball's acceleration is 2. I'm guessing a is 9.8 m/s since it's gravity. I trying to figure out the weight w and acceleration a...
*September 23, 2009*

**Physics but algebra problem**

Having issue with algebra. 89N=ma 99N=m2a would you do something like plugging one into the other such as. a=89/m 99N=99/(2(89/m) prob is when i get a fraction in the denominator i get confused can someone help me. I'm trying to find the mass. Which i will then convert ...
*September 23, 2009*

**Math**

How do I solve this math problem.. (-11-6--5+1+3x2) divided by -5
*September 17, 2009*

**Physics**

Thx I got it!!!
*September 15, 2009*

**Physics**

The archerfish hunts by dislodging an unsuspecting insect from its resting place with a stream of water expelled from the fish's mouth. Suppose the archerfish squirts water with a speed of 2.45 m/s at an angle of 53.0 degrees above the horizontal, and aims for a beetle on ...
*September 15, 2009*

**social studies**

may you please name 1 or more explore(s) that searched for a northwest passage?
*September 7, 2009*

**biology**

respiration works better at higher temperatures because the higher the temperature the more you sweat and the more you sweat more respiration occurs. TELL ME WAT U THINK!
*September 7, 2009*

**AP World History**

Thank you very much! They helped me (:
*August 20, 2009*

**AP World History**

Who can compare&contrast North American racial ideologies with Latin American/Caribbean racial ideologies from the years 1500-1830? Where can I get information about this topic?
*August 20, 2009*

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