Friday

February 12, 2016
Total # Posts: 77

**Thermodynamics**

100 kg of steam is enclosed in a piston-cylinder device, initially at 300°C and 5 bar. It expands and cools to 200°C and 1 bar. A) What is the change in internal energy of the steam in this process?
*February 2, 2016*

**Math Problem**

Thanks for checking Ms.Sue
*November 7, 2015*

**Math Problem**

Please help, is this right. Circle the number closest in value to 8. a. 7.9 b. 8.04 _ c.8.1 (there is a line over the 1) _ d. 7.89 (there is a line over the 9) I selected b: 8.04
*November 7, 2015*

**Chemical Engineering**

A small family home in Tucson, Arizona, has a rooftop area of 1967 square feet, and it is possible to capture rain falling on about 56% of the roof. A typical annual rainfall is about 14 inches. If the family wanted to install a tank to capture the rain for an entire year, ...
*September 7, 2015*

**Chemistry**

472 mL of H2 was collected over water when 1.256g Zn reacted with excess HCl. The atmospheric pressure during the experiment was 754 mmHg and the temp was 26C. What is the pressure in atm of the dry hydrogen gas in the mixture. I don't know how to answer this.
*June 29, 2015*

**sociology 120**

Justice Potter Stewart would most agree with which claim about obscenity? (Points : 1) It is easy to concretely determine what obscenity is. People can intuitively understand what obscenity is. Obscenity ought to be allowed so long as no one is harmed. Obscenity involves ...
*March 1, 2015*

**math**

what an assumption - perhaps evan has 2 siblings that each lost a leg in war then (6 x 2) + (2 x 1] = 12 and 6 + 2=8
*November 5, 2014*

**math**

Triangle ADE is proportional to Triangle ABC. The Length of DE is 20 Ft: the Length of AB is 6 ft. and the Length of BC is 8 Ft. What is the length of AD?
*February 25, 2014*

**math**

It would be 8 for science.
*October 9, 2013*

**calculus**

find the absolute maximum and minimum of sqrt 3 x^2/36 + (1-x)^2/32
*June 8, 2013*

**geometry**

To estimate the height of a flagpole, Marci, who is 5 feet tall stands so that her lines of sight to the top and bottom of the pole form a angle. What is the height of the pole to the nearest foot?
*May 13, 2013*

**social work writing**

What is the parallel structure of this sentence? To install new carpeting, workers must first remove the old carpet, prepare the surface, and then lay down the matting
*January 23, 2013*

**math trigono**

1. If tanθ = –√3 , what is the value of cot ? 2. Find the value of 3sec2.4. (Round to the nearest tenth.) 7. if θ is a standard position angle and cotθ = 1.85, in which quadrant(s) could θ lie? 14.if sinθ = -4/5 and ...
*December 12, 2012*

**statistics**

5. A professor teaching introductory psychology gave the grades that follow. According to the normal curve, she should have given about 4% A’s, 14% B’s, 64% C’s, 14% D’s, and 4% F’s. Do a Chi-Square to determine if the actual grade assignment ...
*December 12, 2012*

**Physics**

Two resistors of equal resistance are connected in series with each other and are connected to a battery that produces a potential difference of 8 V. If the current is 0.2 A what is the value of each resistance?
*November 29, 2012*

**Physics**

A 40,000 kg railroad car initially traveling at 10 m/s collides inelastically with a 20,000 kg railroad car intially at rest. The cars stick together. What is their final speed?
*November 21, 2012*

**math **

-7(4x+2)+5x=170
*November 10, 2012*

**Physics- Elena please help!**

A coin rests 18.0 cm from the center of a turntable. The coefficient of static friction between the coin and turntable surface is 0.420. The turntable starts from rest at t = 0 and rotates with a constant angular acceleration of 0.650 rad/s2. (a) After 3.00 s, what is the ...
*October 29, 2012*

**Physics- Elena please help!**

A digital audio compact disc carries data along a continuous spiral track from the inner circumference of the disc to the outside edge. Each bit occupies 0.60 mm of the track. A CD player turns the disc to carry the track counter-clockwise above a lens at a constant speed of ...
*October 29, 2012*

**math**

China 1% ethiopia 1%
*October 3, 2012*

**math**

What is the value to 2 decimal places of the following integral when a = 24, b = 56, c = 2 and d = 59?
*August 10, 2012*

**Physics**

I was able to figure out where I went wrong with this question. This question can be ignored.
*May 24, 2012*

**Physics**

What coefficient of friction is required to stop a hockey puck sliding at 12.8 m/s initially over a distance of 66.5 m?
*May 24, 2012*

**math**

The area of a rectangular piece of fencing is represented by the equation w(4w+4)=3, where w is the width of fencing in yards. Find the width of the fencing.
*April 26, 2012*

**Algebra 1**

(2x^3 - x^2 - 24x + 12) divided by (2x - 1)
*April 10, 2012*

**Accel Math**

In a dice game if you roll a 2, 4, or 6 you get the value of the die. If you roll as 1, 3, or 5 you lose $5. What is the expected value of the game?
*March 29, 2012*

**Economis**

Name some goods that were at one time free goods are now economic goods?
*July 10, 2011*

**chemistry**

The distance from Earth to the Moon is approximately 240,000 .What is this distance in meters? Express your answer using two significant figures.
*June 9, 2011*

**Math**

a parabola whose rootsare at A(-3,0) and B(6,0) has a y-intercept at point C(0,p),p<0, such that angle ABC is a right angle. if the equation of the parabola is y=ax^2+bx=c, compute the value of (abc)^2
*May 29, 2011*

**physics**

what impulse occurs when an average force of 10n is exerted on a cart of 2.5 s? What change in momentumdoes the cart undergo/ If the mass of the cart is 2K and the cart is initally at rest, calculate it's final speed.
*March 6, 2011*

**physics**

a wheel revolves about a fixed horizontal axis through O (the center). During a certain interval of time, the angular velocity (which initially is 20 rad per second clockwise) changes uniformly at such a rate that the angular displacement is 60 rad counterclockwise, and the ...
*January 31, 2011*

**physics**

a wheel revolves about a fixed horizontal axis through O. During a certain interval of time, the angular velocity (which initially is 20 rad per second clockwise) changes uniformly at such a rate that the angular displacement is 60 rad counterclockwise, and the total angle ...
*January 31, 2011*

**physics**

The position of a point moving on a circular path is given by the equation s= 2t^3 + 6t^2 where s and t are measured in feet and seconds, respectively. The magnitude of the acceleration of the point is 60 fps2 when t = 2 sec. Determine the radius of the circle.
*January 28, 2011*

**physics help**

The magnitude of the velocity of a particle which starts from rest 2 ft below the origin when t = 0 and moves along a vertical axis is directly proportional to the time after starting. The displacement of the particle during the time interval from t = 1 sec to t = 2 sec is 3 ...
*January 20, 2011*

**physics help**

yeah that is word for word
*January 20, 2011*

**physics help**

The magnitude of the velocity of a particle which starts from rest 2 ft below the origin when t = 0 and moves along a vertical axis is directly proportional to the time after starting. The displacement of the particle during the time interval from t = 1 sec to t = 2 sec is 3 ...
*January 20, 2011*

**Dynamics**

A French artillerist, Captain A. Le Duc, developed an empirical formula for the velocity of a projectile in terms of the distance traveled by the projectile in the bore. For a 155-mm gun this equation is v = 3309s /(70 + s) where s is the distance traveled in the bore in ...
*January 19, 2011*

**physics**

A ball is thrown vertically upward with a speed of 23.7 m/s from a height of 2.0 m. How long does it take to reach its high- est point? The acceleration of gravity is 9.81 m/s2 2) How long does the ball take to hit the ground after it reaches its highest point?
*November 12, 2010*

**physics**

A ball is thrown straight up with an initial speed of 60 m/s. How high does it go? Assume the accelera- tion of gravity is 10 m/s22 2)How long is it in the air?
*November 12, 2010*

**business math**

how can a bondholder can estimate the effective interest rate return on the total cost of the investment, including commissions.
*November 6, 2010*

**chemistry**

how much water (in mL's) needs to be added to 330 mL's of a 3.33 molar solution of lithium bromide to make the solution 1.44 molar
*October 13, 2010*

**physics**

A woman is pushing a sofa at constant speed of 1.0 m/s on a horizontal surface. She exerts a horizontal force of 80 N in the direction of motion. Approximately how hard would the woman have to push to keep the sofa moving at a constant speed of 2.0 m/s? explain I am unsure how...
*September 28, 2010*

**physics help**

A woman is pushing a sofa at constant speed of 1.0 m/s on a horizontal surface. She exerts a horizontal force of 80 N in the direction of motion. A) how can the sofa move at constant speed without Newton's first law being violated? B)Approximately how hard would the woman ...
*September 28, 2010*

**calculus**

A 20.0 g copper ring at 0.000°C has an inner diameter of D = 2.54000 cm. An aluminum sphere at 108.0°C has a diameter of d = 2.54508 cm. The sphere is placed on top of the ring, and the two are allowed to come to thermal equilibrium, with no heat lost to the ...
*September 1, 2010*

**calculus**

Find a Cartesian equation for r= 3sin deta
*August 31, 2010*

**calculus help please**

Find the points where the tangent line is horizontal or vertical. Find the area under one period of the curve. x= r(deta - cos deta) Y= r(1- sin deta) deta= pie/3
*August 28, 2010*

**calculus help**

Find the points where the tangent line is horizontal or vertical. Find the area under one period of the curve. x= r(deta - cos deta) Y= r(1- sin deta)
*August 26, 2010*

**Statistics**

Assume that about 45% of all U.S. adults try to pad their insurance claims. Suppose that you are the director of an insurance adjustment office. Your office has just received 110 insurance claims to be processed in the next few days. What is the probability that fewer than 45 ...
*June 25, 2010*

**Statistics**

Total plasma volume is important in determining the required plasma component in blood replacement theory for a person undergoing surgery. Plasma volume is influenced by the overall health and physical activity of an individual. Suppose that sample of 50 male firefighters are ...
*June 25, 2010*

**Statistics**

Total plasma volume is important in determining the required plasma component in blood replacement theory for a person undergoing surgery. Plasma volume is influenced by the overall health and physical activity of an individual. Suppose that sample of 50 male firefighters are ...
*June 24, 2010*

**Statistics**

Assume that about 45% of all U.S. adults try to pad their insurance claims. Suppose that you are the director of an insurance adjustment office. Your office has just received 110 insurance claims to be processed in the next few days. What is the probability that fewer than 45...
*June 24, 2010*

**Statistics**

Assume that about 45% of all U.S. adults try to pad their insurance claims. Suppose that you are the director of an insurance adjustment office. Your office has just received 110 insurance claims to be processed in the next few days. What is the probability that fewer than 45 ...
*June 24, 2010*

**Statistics**

Total plasma volume is important in determining the required plasma component in blood replacement theory for a person undergoing surgery. Plasma volume is influenced by the overall health and physical activity of an individual. Suppose that sample of 50 male firefighters are ...
*June 24, 2010*

**math**

Why does inverse variation not hold (as x increases y decrease) when the constant of variation is negative?
*May 21, 2010*

**math**

Q.1)Find hcf and lcm of the following using fundamntal theorem of arithematic 12,720 and 540. Q.2)Find the greatest number which divides 418,1354 and 2146 exactly leaving remainder 10 in each case. Q.3)If product of HCF and LCM of two numbers is 5120.One number is 6.What is ...
*April 25, 2010*

**Math**

Q.1)If one zero of the polynomial 3x2-kx-2 is 2 find the other zero.allso find the value of k. Q.2)If sum of the zeroes of the polynomial x2-x-k(2x-1) is 0,find the value of k Q.3)If 2 and 3 are the zeroes of the polynomial 3x2-2kx+2m find the values of k and m Q.4)Find the ...
*April 24, 2010*

**Calculus II**

integral of 1/((x^2+1)^2) dx
*April 23, 2010*

**physics help**

Two children are playing a game in which they try to hit a small box on the floor with a marble fired from a spring-loaded gun that is mounted on a table. The target box is horizontal distance D = 1.60 m from the edge of the table, see the figure. Bobby compresses the spring 1...
*March 18, 2010*

**Math/Geometry**

Can you help me with this? Find the area of each regular polygon. Round to the nearest tenth. 1. an equilateral triangle with an apothem 8.9 inches long
*March 3, 2010*

**Physics**

Figure 6-24 shows an initially stationary block of mass m on a floor. A force of magnitude 0.540mg is then applied at upward angle 16 degrees. What is the magnitude of the acceleration of the block across the floor if (a)Us=.6 and Uk=.5 and (b) Us=.4 and Uk=.3?
*March 3, 2010*

**physics**

Body A on an inclined plane weighs 102 N, and body B attatched to Body A by a rope and a frictionless, massless pulley weighs 35 N. The coefficients of friction between A and the incline are Us= .56 and Uk= .25 . Angle is 40°. Let the positive direction of an x axis be up...
*February 27, 2010*

**math**

the least common multiple of 10,24
*November 3, 2009*

**biology**

IN THE EPIDEMIS WHAT THREE THING CAN PASS THOUGH THIS OPENING
*November 3, 2009*

**biology**

the guared cell produce an opening called a stom
*November 3, 2009*

**biology**

mesaphyll layer palisade and spongy
*November 3, 2009*

**biology**

examine the intetnet structure of the leaf drawn say how the different layer are suiled for the function of photosynthes
*November 3, 2009*

**Biology**

What effect does cooking have on each of the following: a) starch b) cellulose c) butter d) sunflower oil e) liquid protein.
*November 3, 2009*

**Biology**

In what kind of food is each of the following substances found: a)lactose b)sucrose c)cellulose d)sunflower oil e)liquid protein.
*November 3, 2009*

**biology**

Give four reasons why we need food.
*November 3, 2009*

**Economics**

I don't know, I wasn't given a property tax...unless there's an official tax % for a certain amount of income....
*September 22, 2009*

**Economics**

Property Tax The Jones family earns $225,000 a year. What % is the property tax of their income? 0.44% 1% 4.4% 0.1% Can anyone please explain me how to do this question? I wasn't given a % amount or anything...
*September 22, 2009*

**Indifference Curves**

For each example below, draw a set of three indifference curves that represent the given preferences. Be certain to show the direction of increasing utility. Also write down a utility function that would be consistent with the given preferences and use that utility ...
*August 7, 2009*

**Social Studies**

what are some famous climbing expeditors of the Andes Mountains and their dates
*January 11, 2009*

**Finite Math**

Factories A and B sent rice to stores 1 and 2. A sent 10 loads and B sent 22. Store 1 used 15 loads and store 2 used 17. It cost $200 to ship from A to 1, $350 from A to 2, $300 from B to 1, and $250 from B to 2. $ 7750 was spent. How many loads went where? 10 from A to 1 0 ...
*November 4, 2008*

**science**

Describe the identifiable physical properties of substances and explain how changes in these properties can occur without changing the chemical nature of the substance. Mass & density are 2 properties of matter. When water freezes it expands making it less dense yet it is ...
*December 14, 2006*

**Physical Science**

How do atoms react with each other to form other substances? I don't know what grade you are in but if this is not understandable, please clarify and repost. Many metals react with many non-metals with the metal losing electrons (forming a positive ion) and the non-metal ...
*December 13, 2006*

**Physics**

Why is The average velocity after pushing V = 2*(16.3m/2.3s) Where did u get the 2 from?
*September 19, 2006*

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