Saturday

February 6, 2016
Total # Posts: 1,392

**master chemistry**

The rate constant of a chemical equation has increased from 0.100s^-1 to 2.70s^-1 upon raising the temperature from 25C to 45C. Find the activation energy. So far I done 3.30=(Ea/8.314)(-2.11x10^-4)
*February 6, 2016*

**physics**

pls can u work it out? I don't understand how u got the answer.
*February 3, 2016*

**physics**

Two trucks A and B each travelling at 40 km/hr, move towards each other . At the instance when the two trucks are at a distance 50 km from one another, a car moving at 60 km/hr overtakes A. How far behind the car is A at the point when the car meets B?
*February 3, 2016*

**Geometry**

Find the point that is one-fourth of the way from (-3,1) to (11,9)
*February 2, 2016*

**calculus**

The demand for your hand-made skateboards, in weekly sales, is q = −4p + 600 if the selling price is $p. You are prepared to supply q = 6p − 400 per week at the price $p. What price should you sell your skateboards for so that there is neither a shortage nor a ...
*January 30, 2016*

**math**

A license plate in a particular state consists of 5 characters. The first 4 characters are made up using the digits 0-9, but the first character cannot be a zero. The remaining characters are letters. No characters can be repeated. How many different license plates are ...
*January 28, 2016*

**LA 1Question 2 parts**

ok thx!
*January 21, 2016*

**Math**

N= -1 x h + 24
*January 20, 2016*

**math **

perform this operation to the correct significant figure. 2.0cm × 0.01m in the correct significant figure. should the answer be in two or one significant figures
*January 19, 2016*

**physics**

an ideal gas occupies a volume of 22.4litres at stp while absorbing 2.53KJ of heat from the surrounding the gas expands isobarically to 32.4 litres. What is the change in internal energy
*January 19, 2016*

**Matg**

If a soft all team has 10 players, how many teams need to be formed for at least 68 players ?
*January 12, 2016*

**Algebra**

a flower garden has a length that is 4 feet shorter than twice it's width. The area of the garden is 96 square feet. What are the dimensions?
*December 16, 2015*

**physics**

determine the energy stored in a 2m long wire of cross sectional area 0.5mm^2 kf the force of 50N is applied to it.
*December 14, 2015*

**physics please urgently**

A body whose weight is W1=75N is tied to another body whose weight is W2=45N .If the coefficient of kinetic friction between W1 and the inclined plane (25°)AB is 0.15,calculate the coefficient of kinetic between W2 and the inclined plane(15°) BC when the two masses ...
*December 12, 2015*

**physics**

please its urgent
*December 12, 2015*

**physics**

W1 and W2 are connected by a rope that is passed through apulley.
*December 12, 2015*

**physics**

A body whose weight is W1=75N is tied to another body whose weight is W2=45N .If the coefficient of kinetic friction between W1 and the inclined plane (25°)AB is 0.15,calculate the coefficient of kinetic between W2 and the inclined plane(15°) BC when the two masses ...
*December 12, 2015*

**numerical analysis**

need a probability distribution to select a parking stall in a parking lot with 50 stalls
*December 10, 2015*

**chemistry**

C2H6 <> C2H4 + H2. when 1.00mol ethane is cracked at 180kPa and 1000K, the yield of ethene is 0.36mol. Calculate the value Kp at 1000K...
*December 9, 2015*

**Ap physics**

fine sand moves through pipes just like fluid. a sandblasting machine moves fine sand through a pipe of inner diameter 2.8 cm at 75L/minutes. the sand comes out from two identical jets at speed 45 m/s. calculated the diameter of the holes through which the jets come out.(...
*December 6, 2015*

**Critical Thinking**

Consider the following conductive argument: P1. Critical thinking teaches the fundamentals of good reasoning. P2. Critical thinking helps people learn how to detect bad reasoning in the arguments they hear and read. P3. Critical thinking principles underlie all the academic ...
*December 6, 2015*

**MATH**

What is 748,000 in scientific notation?
*December 5, 2015*

**physics**

thanks Damon
*December 3, 2015*

**physics**

a 2.0 kg solid mass has an apparent weight 12.34N when totally immersed in water. Calculate the apparent weight of the body when totally immersed in a liquid of density 0.78
*December 3, 2015*

**science**

Ice cubes of total mass 6.00 grams have temperature -4.0°C. Then they are placed in 50.0 grams of water at 20.0°C in an insulated foam cup. What is the equilibrium temperature of the water inside the cup?
*December 2, 2015*

**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*

**Social Studies**

hey is wrong so don't listen to her/him
*November 4, 2015*

**Social Studies**

1. D 2. B 3. A 4. C 5. C 6. A 7. D 8. A 9. B 10.D I got 100% on the test So they are all correct XD *o*
*November 4, 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*