Thursday

July 31, 2014

July 31, 2014

Total # Posts: 895

**physics**

A uniform ladder 10.0 m long is leaning against a frictionless wall at an angle of 60.0° above the horizontal. The weight of the ladder is 18.4 lb. A 60.8-lb boy climbs 4.18 m up the ladder. What is the magnitude of the frictional force exerted on the ladder by the floor?

**American Literature**

According to Langston Hughes in "The Negro Artist and the Racial Mountain, what is the "mountain standing in the way of any true Negro art in America"?

**physics!!!**

To monitor the breathing of a hospital patient, a thin belt is girded around the patient's chest . The belt is a 215-turn coil. When the patient inhales, the area encircled by the coil increases by 41.0 cm2. The magnitude of Earth's magnetic field is 50.0 µT and ...

**Chemistry**

I got it, thanks!

**Chemistry**

An atmospheric scientist interested in how NO is converted into NO2 in urban atmospheres carries out two experiments to measure the rate of this reaction. The data are tabulated below. A: [NO]0 = 9.63 × 10-3 M, [O2]0 = 4.1 × 10-4 M t(s) 0/3.0/6.0/9.0/12.0 [O2] 4.1/...

**Calculus **

Find an equation (in terms of x and y) of the tangent line to the curve r=3sin(5theta) at theta=pi/3

**Calculus**

Thank you!

**Calculus**

Sand is poured onto a level piece of ground at the rate of 0.25 m^3/min and forms a conical pile whose height is equal to its base diameter. How fast is the height increasing at the instant when the height is 0.50 m? V = 1/3(pi)(r^2)h I got 3/pie, is that correct?

**American Literature**

Based on "To Whistler, American," how does Pound view the role of American art and literature?

**American Literature**

least published, like whose work wasn't published that much, or didn't write that much compared to the others.

**American Literature**

Of Fitzgerald, Hemingway, Pound, and Stein, who was the least published writer? I have no clue about it

**Politics**

no, i think it is false

**Politics**

true

**Politics**

At the national level, America is best described as having a direct democracy system of government. True or false

**Politics**

Q. The words “wall of separation between church and state” appear in the Constitution. a. true b. false

**math**

thanks guys!

**math**

solve for x: -3x^2+6x-3=0

**Algebra 2**

log100^x

**PreCalculas**

Can someone tell me what the graph of r=cos (5/2 x angle) should look like?

**physics!!!**

Two capacitors, C1 = 27.0 µF and C2 = 35.0 µF, are connected in series, and a 21.0 V battery is connected across them. (a) Find the equivalent capacitance, and the energy contained in this equivalent capacitor. equivalent capacitance= µF total energy stored= ...

**math**

Kelly opened a savings account with $500 she received at 8th grade graduation four years ago. The account pays 2.5 percent compounded daily. How much should be in the account now?

**math**

How much money would you have in a savings account at the end of one year, if you saved $1000 at two percent interest compounded quarterly? Round to the nearest dollar

**math**

Michelle put $2000 in a savings account at 1.75 percent interest. She kept it there for eight years. How much interest did she earn?

**math**

Orlando has a bank statement balance of $414.25 and $5.90 service charge. His check register shows $374.16 and he has two outstanding checks of $26.54 and $21.78. What is his true balance?

**Chemistry**

This is what I did: moles of H2O = 3.88 delta H rxn = -2044.02 (3.88 moles)(6.01 kJ/mol) = 23.359 kJ (3.88 moles)(75.291 J/mol/C) = 29.263 kJ 23.359kJ + 29.2636 kJ = 29.286 kJ (44 g of C3H8)(29.286kJ/-2044.02kJ) = 0.6304 g But I think I did something wrong??

**Chemistry**

How many grams of propane must be burned to provide the heat needed to melt a 70.0-g piece of ice...? How many grams of propane must be burned to provide the heat needed to melt a 70.0-g piece of ice (at its melting point) and bring the resulting water to a boil (with no vapou...

**Chemistry**

Thanks

**Chemistry**

Knowing that delta Hvap for water is 40.7 kJ/mol, calculate Pvap of water at 46 C

**math**

Bart had an income of $38,250 last year. If the inflation rate is 4.5%, what is his purchasing power?

**math**

If your annual income from a part-time job is $4523, and the inflation rate is 6 percent, what is the purchasing power of your income?

**math**

Let C = 2.32 N + 34180 represent the cost (C) of raising a child to 18 years of age, on an income (N). If the cost is $120,000, what is the income?(

**math**

You spend $685 a month on living expenses. If your monthly income is $1500, what percent of your income do you spend on living expenses?

**math**

Una makes $64 a week, plus 15 percent of the cost of meals that she serves. Use the equation, y = 0.15x + 64, to predict what she makes in a week when she serves $355 worth of meals

**civics**

@writeacher ...i'm still confused.

**civics**

Which is NOT a responsibility of the Department of Agriculture? 1. The opening of foreign markets to U.S. agricultural products 2. To oversee federal anti-hunger programs 3. The designation of lands for private and public use =4. Support for farmers with agricultural research

**Civics**

Which is NOT a responsibility of the Department of Agriculture? 1. The opening of foreign markets to U.S. agricultural products 2. To oversee federal anti-hunger programs =3. The designation of lands for private and public use 4. Support for farmers with agricultural research

**Physics!!!**

The electric field everywhere on the surface of a charged sphere of radius 0.260 m has a magnitude of 545 N/C and points radially outward from the center of the sphere. (a) What is the net charge on the sphere?

**Physics!!!**

The electric field everywhere on the surface of a charged sphere of radius 0.260 m has a magnitude of 545 N/C and points radially outward from the center of the sphere. (a) What is the net charge on the sphere?

**Math**

If your annual income from a part-time job is $2,698, and the inflation rate is 4 percent, what is the purchasing power of your income?

**MAth**

Dan bought a home theater system for $178.99 on the installment plan. The terms of the contract said that he would pay $35 a month for six months. How much are his total payments?

**Algebra 1**

Please help me find the answer to this problem. it would be nice to have the details to how you came by the answer: Radical of 3/4 + radical of 1/3 your help is greatly appreciated

**chem**

you need to make .80 M solution of NiSO4 (aq). How many grams of NiSO4 * 6H2O should you put into a .50 L volumetric flask?

**Physics**

The moment of inertia of an asteroid rotating about its own axis is 5.00 ! 10 4 kg"m2. Its angular velocity is 40.0 rad/s. If a force acts on the asteroid for 0.100 s, increasing the angular velocity to 48.0 rad/s, find its magnitude

**Physics**

A 6110-kg bus traveling at 20.0 m/s can be stopped in 24.0 s by gently applying the brakes. If the driver slams on the brakes, the bus stops in 3.90 s. What is the average force exerted on the bus in both these stops?

**Physics**

Analyze the collision of a baseball with a bat. During which portion of the collision does the baseball’s velocity reach zero? a. before the collision b. during the collision c. one second after the collision d. one-hundredth of a second after the collision

**Physics**

Which conditions will result in the smallest change in momentum? a. a large force over a long time period b. a large force over a short time period c. a small force over a long time period d. a small force over a short time period

**Physics**

A rocket leaves a launch pad at liftoff with a great deal of upward momentum. What was initially given downward momentum? a. the launch pad b. the astronauts aboard the rocket c. the expelled fuel d. the entire Earth

**Physics**

A 0.140-kg baseball is pitched horizontally at 36.7 m/s. When a player hits the ball, it moves at the same speed, but in the opposite direction. If the bat and the ball are in contact for 0.450 ms, calculate the average force the bat exerts on the ball.

**Physics**

Candona strikes a 0.055-kg golf ball with a force of 260 N. If the ball moves with a velocity of 65 m/s, calculate the time the ball is in contact with the club.

**Physics**

A rocket expels gases at a rate of 1.30 x 10^3 kg/s with a speed of 3.00 x 10^4 m/s. What is the force exerted on the rocket?

**Physics**

A lump of clay with a mass of 5.0 ! 10-2 kg is thrown toward a wall with a velocity of 3.0 m/s. The clay bounces off the wall with a velocity of #0.5 m/s. What is the impulse on the clay? If the clay in the previous problem impacted the wall for 5.0 ms, what was the average fo...

**Calculus **

A 727 jet needs to attain a speed of 200 mph to take off. If it can accelerate from 0 to 200 mph in 30 seconds, how long must the runway be? (Assume constant acceleration)

**Physics**

A helium balloon lifts a basket and cargo of total weight 2250 N under standard conditions, at which the density of air is 1.29 kg/m3 and the density of helium is 0.178 kg/m3 . What is the minimum volume of the balloon? The acceleration of gravity is 9.81 m/s2 . Answer in unit...

**chemistry**

A solution of sulfuric acid in water that is 25% H2SO4 by mass has a density of 1178 g/ml. Which expression gives the molarity of this solution?

**speech**

Describe a scenario in which one would expect an opposed audience. Explain context

**Chemistry**

The primary reason for forming multiple bonds when manipulating electron dot structures is:

**Chemistry**

Ionic bonding typically occurs when a ______________ bonds with a ______________

**math**

. A project management consultant estimated that if a particular project was completed, that t years after its date of completion, P thousand persons would be direct beneficiaries of the project, where P (t) = t3/3 - 5t2 +20t, 0<t<12 For what value of t will the maximum ...

**Chemistry**

Hi there - My labs and lectures aren't in synch at the moment so we are now doing a prelab that is asking for info I haven't been taught yet uggg... The prelab question I'm having trouble with is as follows: What is the volume at STP for 0.415 g of argon gas? Also,...

**Math**

Find three ordered pairs that satisfy the equation. y = x+2 (0,1)(0,3)(2,0)

**math**

Thanks, I was close! I'm not that good with plotting graphs.

**math**

Graph the line! y=5x+2 the plot point that i came up with are (0,2)(2,8) is this correct?

**Math **

yes

**math**

Find the amount of compound interest earned in an account that opens with $23,000, earns 3.3% interest compounded daily, and is held for 25 years. Assume 360 days in a year.

**math**

6950*.105=525 is this correct?

**math**

Find the ending balance in an account that opens with $6,950, earns 10.5% interest compounded monthly, and is held for 15 years.

**Math**

Find the ending balance in an account that opens with $5,000, earns 7.5% interest compounded quarterly, and is held for 5 years.

**Chemistry**

Complete this table of values for four aqueous solutions at 25 °C. Solution A: [H+]=0.0093M [OH-]=? pH=? pOH=? Solution B: [H+]=?[OH-]=1.4e-6M pH=? pOH=? Solution C: [H+]=?[OH-]=? pH=5.36 pOH=? Solution D: [H+]=?[OH-]=? pH=? pOH=10.14

**Chemistry**

See above what?

**Chemistry**

Complete this table of values for four aqueous solutions at 25 °C. Solution A: [H+]=0.0093M [OH-]=? pH=? pOH=? Solution B: [H+]=?[OH-]=1.4e-6M pH=? pOH=? Solution C: [H+]=?[OH-]=? pH=5.36 pOH=? Solution D: [H+]=?[OH-]=? pH=? pOH=10.14

**Chemistry**

When a solution is made from 1.0 g of KI and 90 mL of water, what is its molarity?

**Chemistry**

If 4.0 g of hydrogen and 10.0 g of oxygen are mixed according to the equation 2 H2 + O2 = 2 H2O, which is the limiting reagent?

**chemistry**

How many grams of HCl are produced according to the following equation, H2 + Cl2 = 2 HCl, when 4.0 g of hydrogen reacts completely?

**Healthcare professionals**

Hospitals frequently seek ways to ensure survival. Sometimes an adversarial climate cannot be avoided when the action that is being considered is controversial. For example, a hospital may seek to expand its market reach by opening an inpatient drug treatment facility in a sm...

**Healthcare professionals**

Hospitals frequently seek ways to ensure survival. Sometimes an adversarial climate cannot be avoided when the action that is being considered is controversial. For example, a hospital may seek to expand its market reach by opening an inpatient drug treatment facility in a sm...

**chemistry**

how many milliliters of concentrated NaOH(19.3 M) are needed to make 8.00 L of 0.25 M base solution?

**Math**

e.) 22, 344,579.06 a.) 1, 333.8 c.) 4.44 b) 2.97 d) 2.05 can you please put this in order from least to greatest in decimal form

**math**

Help please

**math**

e.) 22, 344,579.06 a.) 1, 333.8 c.) 4.44 b) 2.97 d) 2.05 can you please put this in order from least to greatest in decimal form

**France**

thank you

**France**

What is France most important for?

**physics**

light travels at a constant speed of 3x10^11 centimeters/sec. how long does it take light to reach the earth a distance of 1.5x10^8 kilometers give your answer in seconds and minutes.

**Peacocks**

oh thank you so much Ms. sue and i researched and found out more about them too

**Peacocks**

how is the peacock adaptation effective ?

**Peacocks**

thanks MS.sue

**Peacocks**

Why are male peacocks colorful? How is it an effective adaption?

**Physics**

A hovercraft of mass 69.0 kg can move on a horizontal surface, the x-y plane. A single unbalanced force acts on the hovercraft, but the size of the force is unknown. The hovercraft initially has a velocity of 5.0 m/s in the positive x direction and some time later has a veloci...

**Physics**

The driver of a 1350 kg car, initially traveling at 10.6 m/s, applies the brakes, bringing the car to rest in a distance of 15.0 m. Find the net work done on the car. Not sure how to set this problem up.

**chemistry**

is the lost in mass O? or H2O? sorry.

**chemistry**

An unknown mixture containing KClO3 was added to an ignition tube weighting 41.960g, The tube and mixture was then found to weight 43.772g. After the first heating, the tube and its contents weighed 43.621g. After the second and third heatings, it weighed 43.332g. 1)What mass ...

**chemistry**

sodium borohydride (NaBH4) is used industrially in many organic syntheses. one way to prepare it is by reacting sodium hydride with gaseous diborone. Assuming an 86.8% yield,how many grams of NaBH4 can be prepared by reacting 7.98g of sodium hydride and 8.16g of diborone? i tr...

**Physics**

One boat tows another boat by means of a tow line, which is under a constant tension of 495 N. The boats move at a constant speed of 4.75 m/s. How much work is done by the tension in 1.10 min? Not sure how to apply the work-energy theorem. I assume velocity needs to be calcula...

**Importrant**

No problemo

**Importrant**

Thanks Ms.Sue for all your help your the best helper ever.

**Importrant**

ii.) I’ve missed more than 9000 shots in my career. I’ve lost almost 300 games. 26 times, I’ve been trusted to take the game winning shot and missed. I’ve failed over and over and over again in my life. And that is why I succeed.” – M____________ ...

**Quotes**

Thanks Ms.sue But now i just need to awnser ii) and ii) and thanks for the feedback i used it.

**Quotes**

i.) When elephants fight, it’s the grass that suffers ii.) I’ve missed more than 9000 shots in my career. I’ve lost almost 300 games. 26 times, I’ve been trusted to take the game winning shot and missed. I’ve failed over and over and over again in my ...

**Physics**

Tarzan, who weighs 917 N, swings from a vine through the jungle. How much work is done by the tension in the vine as he drops through a vertical distance of 3.85 m? Simply calculating; W=(917N)*(3.85m)= 3530.45 J Isn't working, I'm not sure how to apply the work equati...

**social studies**

same its D

**math**

thanks jackie

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