Tuesday

December 1, 2015
Total # Posts: 1,354

**physics**

Shows three boxes connected by cords, one of which wraps over a pulley having negligible friction on its axle and negligible mass. The mass of the boxes are mA = 5 kg, mB = 2 kg, and mC = 3kg. When the system is released from rest, Calculate (a) the acceleration of the system ...
*November 25, 2015*

**math**

Find the first order partial derivatives. z=ln(xy-sqrt(x^2-y^2)
*November 23, 2015*

**Philosophy**

The following argument appeared in the draft of a bill before the Louisiana State Legislature in 2001: Whereas, the writings of Charles Darwin, the father of evolution, promoted the justification of racism, and his books On the Origin of Species and The Descent of Man ...
*November 21, 2015*

**Physics**

Flywheels are large, massive wheels used to store energy. They can be spun up slowly, then the wheel's energy can be released quickly to accomplish a task that demands high power. An industrial flywheel has a 1.7 m diameter and a mass of 270 kg . Its maximum angular ...
*November 20, 2015*

**Biochemistry**

Why are Km values of enzymes typically at or near the cellular substrate concentration?
*November 14, 2015*

**Math**

Please help me solve this one. I am looking for 4 digit answers for PLAE and MMSS MAKE+SEAK=PLAE ELKS+ESSK=MMSS
*November 12, 2015*

**Math**

The following rational function describes blood concentration of a certain drug taken via IV over time, find a. the horizontal or oblique asymptotes b. the vertical asymptote c. describe their possible meanings f(x)= x+1/x
*November 7, 2015*

**geometry**

A fire hydrant that is 1.5 feet high casts a shadow that is 2.5 feet long. At the same time of day, a lamppost casts a shadow 15 feet long. What is the height of the lamppost?
*November 3, 2015*

**Calc 3 Surface Area**

Find the surface area of the indicated surface. 1.) The Portion of z=4y+ 3x^2, between y=2x, y=0 , and x=2 2.) The Portion of z= x^2 + y^2, below z=4 . 3.) The portion of z= sqrt(x^2 +y^2) between y=x^2 and y=4. 4.) The portion of 2x+y+z=8 in the first octant. Any help with ...
*October 22, 2015*

**Algebra**

A moderate person takes in 2400 to 2800 calories. Draw a graph on a number line and write a compound inequality for the graph.
*October 22, 2015*

**Psychological Statistics**

A professor records scores from a five-point quiz for each student in an introductory psychology class. If the data were presented in a frequency distribution graph, what type of graph should be used?
*October 16, 2015*

**chemistry**

the mass of helium 4 atom is 6.64648 x 10^24 g and each of its two electrons has the mass 9.10939 x 10^-25 what fraction of the atoms mass is contributed by its nucleus?
*October 15, 2015*

**physics**

pls how can I solve this should the 200cm cube be convert to mass and how?
*October 13, 2015*

**physics**

If 200 cm3 of tea at 95°C is poured into a 150-g glass cup initially at 25°C, what will be the common final temperature T of the tea and cup when equilibrium is reached, assuming no heat flows to the surroundings
*October 13, 2015*

**math**

Evaluate the given integral, where C is the circle with positive orientation. Cauchy integral theorem, integral over C (2z-3)/(z^(2)-4)(z+2) dz, C:|z+3|=3
*October 9, 2015*

**Harmonic Motion**

we know that a particle in Harmonic Motion is moving at v1 @ position x1 and v2 @ position x2. What is A (Amplitude) and w (omega) ?
*October 7, 2015*

**Ece**

Thanks
*October 6, 2015*

**Ece**

Which of the following is not suggested to help a preschooler to separate from their family with less difficulty? A. Meet with a child a few hours before school begins. B. Use transition materials. C. Encourage families to visit. D. Show foster acceptance of the child. I ...
*October 6, 2015*

**Math/Algebra**

@Steve Would these be correct? 1. y=64/9 2. y=16
*October 2, 2015*

**Math/Algebra**

Im stuck on two problems and would really appreciate the help. 1. y varies jointly as a and b, and inversely as the square root of c. y=28 when a=2, b=7, and c=9. Find y when a=4, b=2, and c=4 2. y varies directly as x and inversely as the square of z. y=24 when x=27 and z=3. ...
*October 2, 2015*

**algebra**

How many quarts of permanent anti-freeze must be added to 10% quarts of a 40% anti-freeze solution in a radiator of a truck to make a 25% anti-freeze solution?
*October 1, 2015*

**PHYSICAL CHEM**

THE BOND ENERGY OF THE i2 MOLECULE IS 149Kj/MOL. WHAT IS THE LONGEST WAVELENGTH OF LIGHT THAT WILL BREAK THIS BOND?
*September 30, 2015*

**Simple Harmonic Motion**

A mass 1.2 kg of is attached to a spring and placed on a friction-less air track. Initially the mass is resting in equilibrium. A 10-gram bullet is fired into the mass to initiate oscillatory motion. The bullet hits the mass from the left side at a speed of 120 m/s at t=0 and ...
*September 28, 2015*

**Physics?**

consider two solid cones made from a uniform material. The smaller cone is a ½ scale model of the bigger one. They are released from equal height, quickly reach their terminal velocities and fall in air until they hit the ground. Use scaling reasoning to predict which ...
*September 24, 2015*

**Physics. **

How do I find how long it takes to drain one half of the initial volume of the conical tank . and what fraction of the full drain time is it?
*September 24, 2015*

**Math**

5 cups of water is 1.18294 liters. 1 cup of water is 0.236588 liters. 5 * 0.236588 = 1.18294 liters.
*September 24, 2015*

**algebra**

A triangle is such that the largest angle is 12 times the smallest angle. The third angle is 20 less than the largest angle. Find the measure of each angle. (12-x)+ x+20-(12-x)=180. im having a difficult time setting up the equation
*September 16, 2015*

**Physics**

You are standing on a 50m cliff and throw a ball upwards at 8.2m/s - calculate the maximum height the ball will reach - calculate the time it will take the ball to return where it started - calculate the speed of the ball when it hits the ground. Please help
*September 14, 2015*

**Maths **

Helena wants to make 8 bags or popcorn each weighing 0.375 grams for her friends
*September 10, 2015*

**math**

Determine the enthalpy of 5.0 kg of water at 850 kPa. thankyou very much!
*September 4, 2015*

**Thermodynamics**

If 25.4 kg of copper at 33°C receives 240 kJ of heat. Calculate the final temperature of the metal.
*September 3, 2015*

**Math**

0.00013x^2 + 0.0063x - 4.7=0 Ans: x= -215.91,167.45 Find x I used -b± sqr b^2-4ac/2a I couldn't get that answer. please help.
*September 3, 2015*

**Power transmission**

What is the factor of safety for a steel hanger having an ultimate strength of 70,000 Newton per cm2 and supporting a load of 89.6 kN.The hanger has a cross sectional area of 6.4 cm2.
*September 2, 2015*

**math**

A hydraulic plunger has a 12 cm diameter and a force of 350 kN acts on it. What is the pressure exerted on the plunger?
*August 29, 2015*

**math**

OK I see now . sorry I asked
*August 25, 2015*

**math**

please how did you get 345
*August 25, 2015*

**math**

old how did you get 345
*August 25, 2015*

**math **

The sum of the first 12terms of an arithmetic progression is 135 while the sum of the next 8 terms is 210. Find the common difference
*August 25, 2015*

**math **

a sum of money invested at a simple interest rate R increases to 5/3 times the original sum after 5 years. The value for R is?
*August 24, 2015*

**maths **

a man spent 1/10 of his monthly salary on rent and 5/6 of the remainder on household needs. if $1,800 is left, how much is his monthly salary?
*August 24, 2015*

**maths**

find the number of ways in which three students can be selected from five students
*August 24, 2015*

**math **

in the frustum of a cone,the top diameter is twice the bottom diameter. if the height is h cm, find the height of the cone
*August 20, 2015*

**algebra**

Could someone please help. Consider the function 3x^2-7. Find f(-2). a) -1 b) 5 c) -5 d) 0 I think its a) -1 but not sure. Thank you for your help
*August 19, 2015*

**algebra**

Could someone please help. Consider the function 3x^2-7. Find f(-2). a) -1 b) 5 c) -5 d) 0 I think its a) -1 but not sure. Thank you for your help
*August 18, 2015*

**physics**

A ball is thrown from the ground level with a x-velocity of 25m/s and a y-velocity of 45m/s. What is the ball velocity at the maximum height of trajectory?
*August 17, 2015*

**physics **

The hook of a spring balance carries an object of mass 5kg And the balance is suspended vertically from the roof of a lift. Find the reading on the spring balance when the lift is going down with an acceleration of 0.1m/s^2? g=10m/s^2
*August 17, 2015*

**math**

A sofa cost $500 and is on sale for 20 % off. what is the final cost of the sofa after the discount?
*August 16, 2015*

**Accounting**

Samantha owned 1,000 shares in Evita, Inc. an S corporation, that uses the calendar year. On October 11, 2010, Samantha sells all of her Evita stock. Her basis at the beginning of 2010 was $60,000. Her share of the corporate income for 2010 was $22,000, and she receives a ...
*August 15, 2015*

**maths**

the formula for the area of a cylinder is derived by adding the area of a rectangle (circumference of a circle * height of the rectangle forming the circumference) by twice the area of a cycle, since there are two circles in a cylinder. I was asking why it is not 2 ...
*August 15, 2015*

**maths**

since a rectangle forms two area of a circle shouldn't it also form two circumference in a cylinder
*August 15, 2015*

**MATH**

What is the difference between two places in the local time between two places in latitude 55°N if they are located at longitudes 8°W and 18°E respectively?
*August 13, 2015*

**grammar clauses**

The adjective clause in the following sentence modifies.... The time for complaints about the tax notices you have received has already passed. complaints, time or notices? I think it's complaints..
*July 30, 2015*

**chemistry**

A reaction proceeds by the following three-step mechanism with elementary rate coefficients, k. A + B → C k 1 C → A + B k -1 C → B + D k 2 (C is a chemical radical) (ii) By applying the Steady State Approximation determine the overall order of the reaction. (...
*July 30, 2015*

**English Grammar - Clauses**

No, I'm not supposed to supply any implied words. I guess the fourth option is the one I should choose. How does this phrase not have subjects and verbs? Sorry if this is a silly question, Thank you for your help!
*July 30, 2015*

**prob & stat**

Consider the system of components connected as in the accompanying picture. Components 1 and 2 are connected in parallel, so that subsystem works if and only if either 1 or 2 works; since 3 and 4 are connected in series, that subsystem works if and only if both 3 and 4 work. ...
*July 11, 2015*

**prob & stat**

An academic department with five faculty members—Anderson, Box, Cox, Cramer, and Fisher—must select two of its members to serve on a personnel review committee. Because the work will be time-consuming, no one is anxious to serve, so it is decided that the ...
*July 10, 2015*

**Evaluate the difference, and write the result in t**

(6- 1/2 I)-(3+ 9/2 I)
*July 8, 2015*

**english**

All of us have different stand on what to believe in and it varies because it depends on one’s life experiences. is my sentence right?
*July 8, 2015*

**english**

All of us have different stand on what to believe in and it varies because it depends on one’s life experiences. is my sentence right?
*July 8, 2015*

**english**

all of us has or have?
*July 8, 2015*

**Geometry **

The next step is to construct side PS of the figure so that side PS is parallel and congruent to side QR. The chart below shows the steps each of the four students took to draw side PS: Student 1 Fix the compass at M and adjust its width to point L. Without changing the width ...
*June 20, 2015*

**maths**

Two men and six boys can cut a field in 3hours. If the men work at 3/2 times that of the boys, how many men are required to cut the field in 2hrs.
*June 18, 2015*

**math**

thanks... but i still dont understand how got the equation. pls can you help me out?
*June 18, 2015*

**math**

thanks man.. but why is it 2/m +6/b=1/3 and not 2m+6b=3
*June 18, 2015*

**math**

Two men and six boys can cut a field in 3 hours. If the men work at 3/2 times that of the boys, how many men are required to cut the field in 2hours?
*June 18, 2015*

**math**

85%
*June 17, 2015*

**math**

a final examination score in General maths is weighted four times as much as each test score If the student has a final exam score of 87% and test grades of 70% and 92%, then the mean score is
*June 17, 2015*

**Math**

The Empire Carpet Company orders merchandise for $17,700, including $550 in shipping charges, from Mohawk Carpet Mills on May 4. Carpets valued at $1,390 will be returned because they are damaged. The terms of sale are 2/10, n30 ROG. The shipment arrives on May 26 and Empire ...
*June 15, 2015*

**math**

A pair of fair dice is rolled. What is the probability of each of the following? (Round your answers to three decimal places.) (a) the sum of the numbers shown uppermost is less than 6 (b) at least one 6 is cast
*June 14, 2015*

**Computers **

Your sister is considering purchasing a tablet computer that utilizes RT as the operating system. She asks you if RT is any different from her Windows 8 desktop she has at home. What do you tell her? A. Unlike her Windows 8 PC, RT does not have a tile-based interface. B. RT is...
*June 12, 2015*

**Math**

A company manufactures x units of Product A and y units of Product B, on two machines, I and II. It has been determined that the company will realize a profit of $3/unit of Product A and a profit of $6/unit of Product B. To manufacture a unit of Product A requires 6 min on ...
*June 3, 2015*

**Math**

A financier plans to invest up to $500,000 in two projects. Project A yields a return of 11% on the investment of x dollars, whereas Project B yields a return of 17% on the investment of y dollars. Because the investment in Project B is riskier than the investment in Project A...
*June 3, 2015*

**Math**

If a man runs for an hour and a half at 8 miles an hour due south; and then he continues south on a bus traveling at 55 miles an hour, for 24 minutes. How far did he travel?
*June 3, 2015*

**Algebra 1**

How do you simplify: x/x^2 - 9 subtracted by x/x + 3 then adding 3/ x - 3. I got common denominators than simplified. I ended with -x^2 + x + 9. Where did I go wrong?
*May 27, 2015*

**Algebra 1**

How would you solve 5a^2 + 21a/2a^2 + 6a divided by a + 4/4a^2 divided by 5a^3 + 11a^2 + 2a/a + 3?
*May 27, 2015*

**Algebra 1**

Perform the indicated operations and simplify. 3z^2 - z - 2/6z^2 - 11z - 10 times 4z^2 - 25/2z^2 + 11z + 15 After I factored I got (3z + 2)(z - 1)/(3z + 2)(2z - 5) times (2z - 5)(2z + 5)/(2z - 5)(z + 3) After canceling I got (z - 1)(2z + 5)/(2z - 5)(z + 3). Where did I go wrong?
*May 27, 2015*

**ELA**

I believe it is prescient. I say this because that is the word least likely to be used making it more fancy. This could mean the icing on the cake.
*May 27, 2015*

**combinatorics**

10 red, 10 blue, 10 green matches are used to build a regular icosahedron, how many possible solutions are there?
*May 24, 2015*

**combinatorics**

For the 6 faces and 8 vertices of a regular hexahedron, respectively sealed with red and blue these 2 beads (each face contains a bead and each vertex contains a bead), how many different types of solutions are there?
*May 24, 2015*

**combinatorics**

There are 4 kinds of colored beads( r, g, b, y) to seal onto the 6 vertices of a regular hexagon, how many solutions are there?
*May 24, 2015*

**combinatorics**

Use 3 types of colored beads to seal onto the vertices of a regular pentagon, how many possible solutions are there? Hint: The bead is a full round bead
*May 24, 2015*

**combinatorics**

Paint the 4 faces of a regular tetrahedron by using 3 types of colors, how many possible solutions are there?
*May 24, 2015*

**Combinatorics **

We have two kind of tiles : 1 x 1 and 2 x 2, and use them to cover the 8 x 3 road without overlapping, how many different ways to arrange tiles there?
*May 24, 2015*

**combinatorics. **

Suppose a manufacturer produces the football as shown below, they want to print one 2014 football World Cup logo and one Brazilian flag on it, note there are only two signs totally. These two signs are printed in two polygons. If we do not consider the position and direction ...
*May 24, 2015*

**Combinatorics**

6x 35= 210
*May 23, 2015*

**Social Studies**

Extended Response 1. How are the cultures in South America like the cultures in Mexico? How are they different? 2. How might the cultures of Latin America be different if the Spanish and Portuguese had never arrived? What kind of culture do you think would dominate the region ...
*May 14, 2015*

**Social Studies**

Are those a shortage of housing and potatoes?
*May 14, 2015*

**Social Studies**

Please check my answers??? 4. Trade and travel among the regions of South America have been affected by a. natural resources and vegetation b. high mountains and dense rain forests (I picked this) c. the Caribbean Sea and the Pacific Ocean d. Argentina and Venezuela's ...
*May 14, 2015*

**English**

1. MLA formatting requires which of the following? A. double spacing throughout, including the Works Cited page B. half-inch margins C. a title page D. paragraphs indented one inch 2. In MLA, parenthetical references _______. A. are optional and may be interchanged with ...
*May 1, 2015*

**Math**

Small cubes with edge lengths of 1/4 inch will be packed into the right rectangular prism. How many small cubes are needed to completely fill the right rectangular prism? The height is 3 3/4 inches, the width is 5 inches, length is 4 1/2 inches. ( the small cubes will be 1/4 ...
*April 30, 2015*

**Math**

6 and 8 6+6=12 8+8=16 12+16=28 perimeter also 6 x 8= 48 area
*April 29, 2015*

**math**

The graph of a second-order polynomial is shown below, and the intercepts with the axes are marked. Explain how you can use the graph to write the polynomial as a product of linear factors (x-a)(x-b). Be sure to state the values of a and b.
*April 29, 2015*

**Math**

Identify all sums, products, and factors in the expression (x+5)(y+9) +(2+x)(y+23)
*April 27, 2015*

**Math**

The plane P1 has equation r = (2,1,1)+lambda(-2,1,8)+mu(1,-3,-9) The plane P2 has equation r = (2,0,1)+s(1,2,1)+t(1,1,1) Show that for points that lie on P1 and P2, lambda=mu I have no idea how to start... help! Thanks!
*April 25, 2015*

**math**

On a 3 day hike, Robert hiked twice as many miles on the first day as on the second day. On the third day he hiked 5 miles. Carlos hiked 5 miles on the first day and three times as many miles as on the second day as on the third day. (a) Write and simplify an expression for ...
*April 22, 2015*

**math**

It was a typo. It should have said Robert instead of Matt. Please help me
*April 22, 2015*

**math**

On a three day hike, Robert hiked twice as many miles on the first day as on the second day. On the third day he hiked 5 miles. Carlos hiked 5 miles on the first day and three times as many miles on the second day as on the third day. (a) Write and simplify an expression for ...
*April 22, 2015*

**math**

Sharon wants to buy a bike helmet that costs $21. She already has $9 saved. She plans to sell lemonade to earn enough money to buy the bike helmet. For each cup of lemonade she sells, she makes a profit of $0.20. Explain how to determine how many cups of lemonade she must sell...
*April 22, 2015*

**statistics**

A two-tailed test is conducted at the 0.10 significance level. What is the P-value required to reject the null hypothesis? A. Greater than or equal to .010 B. Greater than or equal to 0.05 C. Less than or equal to 0.10 D. Less than or equal to 0.05 Is it C?
*April 18, 2015*