# Posts by John

Total # Posts: 8,337

**Physics**

A boy is trapped in a large area of very soft mud. A man rescues the boy by crawling across a long, light board rather than by walking into the mud. What effect, if any does the board have on the force and the pressure on the mud, compared with walking? A. force and pressure ...

**Physics**

Chisel is a pivot point between the wire and a 2 cm distance between the pins and the hand is 10 cm F 50 Newton force How much is the mechanical advantage? How much is the forces acting on the wire?

**Chemistry**

A gas occupies 30 0dm3 at stp what volume would it occupy at 91 and 380mm hg?

**Science**

In the past, what makes someone or a group of people considered to be "unfit" members of society?

**Math**

Never mind I eventually found out how to solve it myself.

**Math**

Given f(x)=-2-3x-x^2 , find f(1+k)

**Science**

What features of Western culture help lead people to believe in their primacy over nature?

**Algebra 2**

Adults 5.00 Kids 3:50 240 tickets sold for 1140 How many adults? How many kids?

**PreCalc**

Thank you sooo much! But how can I solve the 5th degree one algebraically?

**PreCalc**

Can you guys also help me on this one? x^5 + 4x^4 -16x -16 < 0

**PreCalc**

Solve each inequality: (1/(2b+1)) + (1/(b+1)) > (8/15) (2/(x+1)) < 1 - (1/(x-1)) My teacher told me the answer is in interval notation, and that a number line is used to solve.

**Math**

(8.86 + 1.0 * 10^-3) / (3.610 * 10^-3) Calculate the above formula, expressing the answer in scientific notation with the correct number of significant figures: 8.86 + 1.0 * 10^-3 = 8.86 + 0.0010 = 8.8610 = 8.86. 8.86/(3.610 * 10^-3) = 2454 2.454 * 10^3 Please confirm if I did...

**quantitative methods**

a packing device is set to fill detergent powder packet with a mean weight of 5 kg . The standard deviation is known to be 0.01 kg. these are known to drift upwards over a period of time due to machine fault, which is not tolerable. A random sample of 100 packets is taken and ...

**English**

What belief does Whitman share with Ralph Waldo Emerson and other transcendentalists? A) We should live our lives well to achieve everlasting happiness. B) Man learns his most important lessons and insights in the present, through direct experience. If I recall correctly ...

**physics**

P.S. I forgot to multiply by the .5 in the second to last step . It should read : d = 696 + .5 * 1140 m d = 1266 m

**physics**

d = V0 * t + 1/2 a t ** 2 where average acceleration a = (V1 - V0) / dt V0 = 58 m/s V1 = 153 m/s dt = 12 s a = (153-58)/12 m/(s*s) a = 7.9 m/(s*s) d = 58 * 12 m/s *s + .5 * 7.9 * (12 * 12) m/(s*s) * (s*s) d = 696 + 1140 m d = 1836 m

**Physics and Math**

P.S. forgot to take square root in time calculation. Should be t = .0007s so v = 100 - 40000 * .0007 * .0007 v = 100 - .02 v = 99.98 m /s

**Physics and Math**

v = V0 + a * t F = m * a s = .5 * a * t^2 where s = 0.01 m V0 = 100 m / s m = 0.5 kg F = 2000 kg m/(s^2) solving f=ma for a : a = f/m = -2000/0.05 m/(s^2) = -40000 m/(s^2) solving s = .5at^2 for t : 2s = at^2 2s/a = t^2 t = square root(2s/a) t=square root (2 * 0.01m) / -40000 ...

**physics**

v = V0 + a * t V0 = 0 a = 2.75 m/s^2 t = 3.00 s v = 0 + 2.75 * 3.00 m/s v = 8.25 m/s

**Science/earth**

How does money and politics affect the public claims about global warming? Pick on news source (news company, think tank, or university) and investigate its credibility.

**Pre-Calc**

Yeah sorry, my bad. I must have plugged in the numbers wrong, since I just got 44.5 for my answer. You guys are right, Thanks so much Steve and Reiny for your help!

**Pre-Calc**

Sorry, I'll be more clear. The question already stated how high the ferris wheel is at t=8 seconds. The highest point the ferris wheel reaches is 63 feet and the time for that is 8 seconds. What I'm trying to find out is how high the ferris wheel is when t=5 seconds ...

**Pre-Calc**

when i plug in t=5, I get 62.99 feet, but isn't that the height when t=8 seconds?

**Pre-Calc**

A ferris wheel is 63 feet tall when it reaches its highest point at 8 seconds. At the bottom of the ride, you are 3 feet off the ground. So how high off the ground will you be 5 seconds after the ride starts? Write a function f so that f(t) will equal how high in feet you will...

**Algebra 1**

x^4-9x^3-7x^2-8x+2 Divide by x^2+x+1 Thanks

**Algebra 1**

6x^3-3x^2+x-40 Divided by x-2

**Algebra**

The length of a rectangle is 8 ft less than three times the width, and the area of the rectangle is 35 ft2 . Find the dimensions of the rectangle.

**science**

How does money and politics affect the public claims about global warming? Pick on news source (news company, think tank, or university) and investigate its credibility.

**Algebra**

An acre of land is chosen at random from each of the three states listed in the table at the right. What is the probability that all three acres will be farmland? 1. Does the choice of an acre from one state affect the choice from the other states? 2. How must you rewrite the ...

**Algebra**

An acre of land is chosen at random from each of the three states listed in the table at the right. What is the probability that all three acres will be farmland? 1. Does the choice of an acre from one state affect the choice from the other states? 2. How must you rewrite the ...

**math**

a boy has 380 prize tickets he wants to exchange for action figures at a prize booth,the prize both tickets 5 tickets can be exchanged for a large figure and 7 tickets for 2 small figures the boy wants 4 times as many small action figures as large can the boy get 80 small ...

**Algebra**

Thank you.

**Algebra**

Thank you for your quick reply. Can you please share the work ? Guess work in math could land up in wrong spot.

**Algebra**

r^3-24r-5 / r-5 How to divide r^3-24r-5 / r-5 quickly with less steps ? Thanks

**Physics**

-10.8 is the impulse

**Calculus**

If 3x^2+y^2=7 evaluate ((d^2)y)/(dx^2) when x=1 and y=2

**calculus**

use implicit differentiation to find y=(x+8)^(3x)

**Chem**

Sorry I wasn't clear. That was the answer I got. I think my sig figs wrong cause I don't see any with three.

**Chem**

I set it up just like that and got kelvins right but still got it wrong 301.15k for T1 258.15k for T2 Answer was 0.887

**Chem**

A pressurized can of whipping cream has an internal pressure of 1.035 atm at 28°C. If it is placed in a freezer at -15°C, what is the new value for its internal pressure?in atm

**calculus**

No idea where to start The cost in dollars of producing x units of a particular camera is C(x) = x2 - 10000. (10 points) Find the average rate of change of C with respect to x when the production level is changed from x = 100 to x = 101. Include units in your answer. Find the ...

**calculus**

so would the velocity be -29.4?

**calculus**

supposed to be a 4.9t^2+550

**calculus**

Do I just put in 3 for t? A ball is dropped from a tower 550 meters above the ground with position function s(t) = 4.9t2 + 550. What is the velocity of the ball after 3 seconds?

**Calculas**

Do I just put in 3 for t? A ball is dropped from a tower 550 meters above the ground with position function s(t) = 4.9t^2 + 550. What is the velocity of the ball after 3 seconds?

**Calculus (math)**

89.03

**P.E. help**

yep i got 100

**Physics**

A projectile is shot vertically upward with a given initial velocity. It reaches a maximum height of 100 m. If, on a second shot, the initial velocity is doubled then the projectile will reach a maximum height of ____________?

**English**

Which diagram correctly represents this sentence? Andy teaches and plays the guitar

**PHYSICS**

X = Vo*t+ 1/2*a*t^2 solve for x

**English**

How does voice affect the credibility of a text?

**physics**

A train moving at a constant speed is passing a stationary observer on a platform. a flute player is playing a note with frequency of 940Hz. after the flute has passed, the observer hears the sound frequency of 915Hz. What is the speed of the train? The speed of sound in air ...

**physics**

A train moving at a constant speed is passing a stationary observer on a platform. a flute player is playing a note with frequency of 940Hz. after the flute has passed, the observer hears the sound frequency of 915Hz. What is the speed of the train? The speed of sound in air ...

**Chemistry**

How many liters of stomach acid (pH = 4.000) will be neutralized by a 1.50 g tablet of "Bicar", a commercial tablet which is 50% flavored and 50% NaHCO3? Note that: NaHCO3(s) --> Na+(aq) + HCO3-(aq) and: H+(aq) + HCO3-(aq) --> H20(l) + CO2(g) So far I've ...

**Math (Simplifying Fraction)**

(x^-1+4x^-2)/(1-16x^-2)

**mechanics**

what is coefficient of friction of a 25lb object resting on a horizontal surface that requires 10lbs to move?

**Chemistry; stoichiometry**

Thanks for the advice! I was still getting an odd theoretical yield but that was probably from the data we collected.

**Chemistry; stoichiometry**

Determine the theoretical yield of silver that is produced if the other product is Copper(II) Nitrate. Copper that reacted: 0.3180 This is what I had: 0.3180g Cu x 1mol Cu/63.5g Cu x 2mol Ag/1mol Cu x 107.87g Ag/1mol Ag = 1.079g Ag (Set up in factor label method)

**Advance Algebra**

thanks:) mapuan here:)

**m**

yes, of course! there is no problem to each the kids science everyday! science is a very exciting thing!

**physics**

what impulse is needed to slow a 45kg object from 15m/s to 12m/s?

**physics**

steven throws a 3.5kg ball at a speed of 25m/s. what is the momentum of the ball? Please show work

**physics**

how many significant digits are in the following measurement 2.546m

**algebra**

how do you write the simplest polynomial function with the given zeros

**algebra**

how do you write simples polynomial function with the given zero 1-i and 2

**Chemical Biology**

Which fruits or vegetables or plants do not contain catalase enzyme?

**math**

deliias car weighs 2 tons how many ounces does the car weigh?

**algebra**

how to you solve polynomial equation by factoring x^3 + 3x^2 - 9x = 27

**algebra**

solve polynomial equation by factoring x^4 +100 = 29x^2

**Language Art Novel**

ms. sue are you a stripper?

**algebra**

solve polynomial equation by factoring 2x^3 - 12x^2 = 32x - 192

**algebra**

how do you solve polynomial equation by factoring 3x^4 + 11x^3 = 4x^2

**physics**

how do you solve 3x^4 + 11x^3=4x^2

**Chemistry**

carbon dioxide has a henrys law constant of 3.4E-2 mol/l*atm what is the molar concentration of CO2 in water if the partial pressure of CO2 in air is .000387. i know i have to use S=Kh*P but that gives you soluability where do i go from here to find molar concentration of CO2 ...

**math**

need help please. the time required for one complete oscillation of a pendulum is called its period. if L is the length of the pendulum, then the period is given by P= 2 times pie multiplied by the square root of (L/g), where g is a constant called the acceleration due to ...

**algebra**

using long division (x^6 - 4x^5 -7x^3) / (2x^3)

**physics**

a 2.0-kg ball has a momentum of 25 kg*m/s. what is the ball's speed?

**physics**

a net force of 200 newton's is applied to a wagon for 3 seconds. this causes the wagon to undergo a change in momentum of

**physics**

a net force of 100 newton's is applied to a wagon for 5 seconds. this causes the wagon to undergo a change in momentum of

**AP CALC. AB**

A) 1.123m/min

**Chemistry**

42 J

**Math 3371**

In a certain year, 26% of all teenagers in the United States had checking accounts. Your bank, TeenChex Inc., is interested in targeting teenagers who do not already have a checking account. (a) If TeenChex selects a random sample of 3,000 teenagers, what number of teenagers ...

**Business statistics**

Hello, I'm struggling trying to find the answer for b. Do you know the answer and help would greatly be appreciated! A clean air standard required that vehicle exhaust emissions not exceed specified limits for various pollutants. Many states require that cars be tested ...

**science**

The question is in reference to o2 canisters attached to space suites during space travel

**science**

What provides pure O2 for inhaling and canisters to collect CO2 CO2.

**Chemistry**

Are there any substances that are soapy and/or bitter in nature but are not bases/alkali?

**Chemistry**

Neutralizing acids.

**Chemistry**

Are there any chemical reactions or observations that involve sodium hydroxide or any other bases, but cannot be used to confirm its basic nature?

**calculus**

it costs 8 dollars to manufacture and distribute a backpack.If the backpack sell at x dollar each, the number sold , n, is given by n= 3/(x-8)+5(100-x) . Find the selling price that will maximize the profit.

**safety contest scramble**

Four words. First word (8 letters), second (6 letters) third (four letters) fourth word (9 letters). The letters are oneqplmeiuoraeectttnepsrivp. Any ideas?

**Physics**

A 5.00-kg block is placed on top of a 12.0-kg block that rests on a frictionless table. The coefficient of static friction between the two blocks is 0.650. What is the maximum horizontal force that can be applied before the 5.00-kg block begins to slip relative to the 12.0-kg ...

**mathematics**

ssa

**Physics**

Two masses ( 2.3 kg and 4.2 kg) connected by a massless rope hung over opposite ends of a frictionless pulley. Each mass is initially 1.50 m above the ground, and the top of the pulley is 6.5 m above the ground. What maximum height does the lighter object reach after the ...

**physics**

Yes

**SCIENCE**

Hello

**Algebra**

A kayaker paddles upstream for 1.5 hours then turns his kayak around and returns to his tent in 1 hour. He travels 3 miles each way. What is the rate of the rivers current?

**Chemistry**

How many hydrogen bonds can each (i) water and (ii) ice molecule form?

**calculus**

find the derivative of y y= 2 (22x+31)^(3/2)+ arctan((22x+21)^(1/2))+ln(11x+16)-22x-30

**Calculus**

i didn't get what you did can you plzz help me again ?

**Preschool/Kindergarten**

I agree with Ms. Sue. d is the best choice.