Saturday

February 13, 2016
Total # Posts: 4,243

**ENGR**

1. Use the axioms of probability to show the following: (a) For any event E, P{Ec} = 1 − P{E}. (b) P{∅} = 0. (c) For any events E and F, if E ⊂ F, then P{E} ≤ P{F}. (d) If the events E1, E2, and E3 are mutually exclusive, then P{E1∪E2∪E3} = ...
*September 10, 2014*

**calc**

Consider the vector function given below. r(t) = 7t, 3 cos t, 3 sin t (a) Find the unit tangent and unit normal vectors T(t) and N(t). i found T(t) but I can't get N(t)
*September 10, 2014*

**chem**

if 14.66ml of a standard .2616M KOH solution reacts with 57.5ml of CH3COOH solution, what is the molarity of the acid solution?
*September 9, 2014*

**statistics**

let E,F and G be three events. state expressions fo rthe events. a. only F occurs b. exactly two of the events occur. c. at leasat one of the events occur. d. E and G occur but F does not. how do I go about writing these. do I use like union and intersection?
*September 5, 2014*

**chemistry**

how many mL or .0252M HNO3 are required to neutralize 25.00mL of .0148M of Sr(OH)2? and how did you get the answer!!!
*September 1, 2014*

**Math- urgent**

Vong grilled 21 burgers at a block party. He grilled the same number of pounds of turkey burgers as hamburgers. Each turkey burger weighed 1/4 pound and each hamburger weighed 1/3 pound. How many of each did Vong grill?
*August 27, 2014*

**Math- urgent**

Solving Systems by Substitution Maribel has $1.25 in her pocket. The money is in quarters and dimes. There are a total of 8 coins. How many quarters and dimes does Maribel have in her pocket? I think the equation is 10x+25x=$1.25 and x+x=8 but I'm not sure.
*August 27, 2014*

**math**

calculate the upper limit for the definite integral from -2 to 2. oh x^2+1 dx with the partition P=-2,-1,0,1,2
*August 22, 2014*

**English**

Is there any website that checks your punctuation and grammer?
*August 19, 2014*

**math**

5/x+7/y=31,7x+5y=29xy by comparision and subsitition method
*August 19, 2014*

**Biology**

thank you
*August 18, 2014*

**Biology**

I think D.
*August 18, 2014*

**Biology**

Sorry its, C. Humans have had no impact on the world's environment D. Humans have had a large impact on the world's environment
*August 18, 2014*

**Biology**

Thank You So Much! IS B. THE ANSWER TO THIS ONE? Which of the following statements are true? A.) Destruction of rain forests has no effect on living things. B.) Destruction of rain forests increases the rate of evolution of rain forest organisms. C.) Humans have had no impact ...
*August 18, 2014*

**Biology**

A "tree of life" explains: a. how organisms are related to each other b. how organisms differ from each other c. the lineages of various organisms. d. All of the above
*August 18, 2014*

**important math question**

I am also having trouble with this problem for a differentiable function it is known that f(3)=5 and f'(3)=-2 use differentials to get the approx. value of f(3.02)
*August 17, 2014*

**important math question**

how do you get that without using a calc?
*August 17, 2014*

**important math question**

the equation x^3 -x-5=0 has one solution for x between -2 and 2. what is the solution? how do I get this
*August 17, 2014*

**Chemistry**

A cow weighing 1317 slug can yield10% steak. Steak may contain 5.8 % fat. How many milligrams of fat can you get from 0.548 slug of steak? (1 slug = 14.59 kg) Answer in units of mg I started the conversion by converting slugs to kg, but I didn't know what to do after that...
*August 16, 2014*

**Geometry**

Draw a diagram. Triangles. AB n(upside down U) CD = CB
*August 15, 2014*

**POL201**

With unfunded mandates, the national government (Points : 1) respects state sovereignty. passes a national policy measure which will require state spending. approves a state policy measure and provides 1/3 of the required state spending. fully pays for the state spending ...
*August 4, 2014*

**pol week 2 quiz**

Really I thought it was a legislative veto I am going to have to do some more investigation
*August 4, 2014*

**pol week 2 quiz**

Despite the greater federal authority in the federal relationship, federalism is still important for all the following reasons except that (Points : 1) it provides the best means of developing a vast country because it allows for experimentation. it may stimulate the interest...
*August 4, 2014*

**pol week 2 quiz**

Congress controls the Executive branch by issuing (Points : 1) orders to stop what it is doing. a halt of funding for programs. a legislative veto. its authority to a different branch.
*August 4, 2014*

**pol week 2 quiz**

NOpe I have all the answers I cant seemed to fine a few of them
*August 4, 2014*

**pol week 2 quiz**

The basis for national power lies in (Points : 1) the Interstate Commerce Clause only. the Supremacy Clause and the Treaty Clause only. the Treaty Clause and the Interstate Clause only. the Interstate Commerce, Supremacy, and Treaty Clauses. Question 2. 2. In Cooperative ...
*August 4, 2014*

**math**

find the volume of the solid obtained by rotating the region bounded by the given curves about the specified line. x=2=2sqrty, x=0, y=9 about the y axis. Is this the disk or shells method and how do I set this problem up?
*August 4, 2014*

**physics-please help**

is the answer in T? I had 9.3568E-26 and it says the answer is wrong
*August 4, 2014*

**physics-please help**

A proton, traveling with a velocity of 6.8 × 106 m/s due east, experiences a magnetic force that has a maximum magnitude of 8.6 × 10-14 N and direction of due south. What are the magnitude and direction of the magnetic field causing the force? If the field is up, ...
*August 4, 2014*

**math**

find teh volume of the solid by rotating y=1-x^2, y=0 around the xaxis
*August 3, 2014*

**science**

The angular velocity, after the collision, is smaller. The total angular momentum of the system is constant. The angular velocity, after the collision, is the same. The angular velocity, after the collision, is larger. The kinetic energy of the system is constant. The total ...
*August 1, 2014*

**science**

Consider a rotating platform such as you used in lab. Imagine that it is initially rotating at some angular velocity. You drop a disk, that is not rotating, onto the top of the rotating platform so that it sticks to the rotating platform and begins rotating along with the ...
*August 1, 2014*

**POL201 **

A policy area in the middle of these cross-currents is elementary and secondary education – a subject traditionally under local control, with some oversight by the states. However, during the last four decades – especially since 2001 – the national government&#...
*August 1, 2014*

**physics**

A string is wrapped around a uniform disk of mass M = 1.6 kg and radius R = 0.10 m. (Recall that the moment of inertia of a uniform disk is (1/2)MR2.) Attached to the disk are four low-mass rods of radius b = 0.17 m, each with a small mass m = 0.6 kg at the end. The device is ...
*July 31, 2014*

**sciecne**

A space station has the form of a hoop of radius R = 15 m, with mass M = 6000 kg. Initially its center of mass is not moving, but it is spinning slowly with angular speed ù0 = 0.0018 radians/s.Then a small package of mass m = 5 kg is thrown by a spring-loaded gun toward...
*July 30, 2014*

**math**

thanks. so how woudl i find For which values of t is the curve concave upward?
*July 28, 2014*

**math**

Find dy/dx and d2y/dx2. x = et, y = te−t
*July 28, 2014*

**POL 201**

Well, you were correct I just got the grade back as that being correct I still did miss 2 others but I will not forget the correct answers next time. Thanks again
*July 26, 2014*

**POL 201**

Thank you so much, in my reading in my text I couldn't find anything about becoming corrupt.
*July 26, 2014*

**POL 201**

Those who attended the Constitutional Convention believed that (Points : 1) England was an evil society. America had made a great mistake in fighting the revolutionary war. British institutions of government were good but they became corrupt. America would only achieve ...
*July 26, 2014*

**science**

I thought you just do 7(20)+(5)10
*July 24, 2014*

**science**

thanks, can you help me with this one What is the angular momentum A if A = <7, 5, 0> m and = <-20, 10, 0> kg·m/s?
*July 24, 2014*

**science**

You know that a collision must be "elastic" if: The momentum of the two-object system doesn't change The sum of the final kinetic energies equals the sum of the initial kinetic energies There is no change in the internal energies of the objects (thermal energy, ...
*July 24, 2014*

**English/ Help**

it was B actually -.-
*July 22, 2014*

**science**

A hoop of mass M = 4 kg and radius R = 0.4 m rolls without slipping down a hill, as shown in the figure. The lack of slipping means that when the center of mass of the hoop has speed v, the tangential speed of the hoop relative to the center of mass is also equal to vCM, since...
*July 21, 2014*

**math**

what is the radius of convergence for the sum n=1 to infinity of 3(-1)^n(n)(x^n)?
*July 21, 2014*

**science**

does density affect weight?
*July 19, 2014*

**Math**

I don't know how to explain c. I know the next 3 terms is -19,-27,-36
*July 14, 2014*

**Math**

Continue the pattern for three more terms. Describe how to find the successive terms. a)12,9,6,3 b)5,6,8,11 c)3,-1,-6,-12 Please help
*July 14, 2014*

**Science**

Make a flowchart to show how the event m might affect a forest ecosystem. A logging company clear-cuts the trees in the forest. My question is; What are the events that might affect a forest ecosystem when clear-cutting the trees in the forest?
*July 10, 2014*

**POL 201 Week 4 quiz help**

Question 1.1. The Judiciary Act of 1789 established all of the following except that the Supreme Court would (Points : 1) *A) have one Chief Justice. B)have five associate justices. C)sit in two sessions each year. D)determine how many federal districts there would be. ...
*July 5, 2014*

**POL 201 Week 4 quiz help**

Question 1.1. The Judiciary Act of 1789 established all of the following except that the Supreme Court would (Points : 1) have one Chief Justice. have five associate justices. sit in two sessions each year. determine how many federal districts there would be. Question 2.2. ...
*July 5, 2014*

**Science**

How do trees decompose?
*July 3, 2014*

**Science**

Is a beaver a consumer or a producer and how do you know that?
*July 2, 2014*

**science**

and to go along with that. if velocity and mass are constant does that mean the change in magnitude of the momentum is 0?
*July 2, 2014*

**science**

Which way is the momentum occuring if a child is riding a merry go round at a constant speed. So for example at each 4 "sides" of the merry go round which direction is momentum . I know the velocity is always tangent to the circle at a specific point. does the ...
*July 2, 2014*

**math**

Use the Trapezoidal Rule, the Midpoint Rule, and Simpson's Rule to approximate the given integral with the specified value of n. (Round your answers to six decimal places.) The integral of e^(3sqrt(t)) sin3t dt from 0 to 4. n=8
*July 1, 2014*

**math**

An isosceles triangle has a base 9.6 units long. If the congruent side lengths have measures to the first decimal place, what is the shortest possible length of the sides?
*July 1, 2014*

**Eng **

What is the interpretation of the journey by Duane big eagle
*July 1, 2014*

**calc**

evaluate the integral from 4 to 5. (x^3 -3x^2 -9)/(x^3 -3x^2)
*June 30, 2014*

**science**

A car of mass 2900 kg collides with a truck of mass 4800 kg, and just after the collision the car and truck slide along, stuck together. The car's velocity just before the collision was < 34, 0, 0 > m/s, and the truck's velocity just before the collision was <...
*June 25, 2014*

**science**

A bullet of mass 0.062 kg traveling horizontally at a speed of 150 m/s embeds itself in a block of mass 90 kg that is sitting at rest on a nearly frictionless surface What is the speed of the block after the bullet embeds itself in the block?
*June 25, 2014*

**sciecne**

Two thin hollow plastic spheres, about the size of a ping-pong ball with masses (m1 = m2 = 2e-3 kg) have been rubbed with wool. Sphere 1 has a charge q1 = -6e-9 C and is at location < 40e-2, -20e-2, 0 > m. Sphere 2 has a charge q2 = -6e-9 C and is at location < -50e-2...
*June 25, 2014*

**Business**

Was the action of the NPA in line with its and the RBA’s Code of Conduct.
*June 24, 2014*

**math**

Thank you .. but the right answer in my book is 115g
*June 23, 2014*

**math**

How many gram ofsodiun fluoride should be added to 100000liter of drinking water containing 0.6 ppm of sodium fluoride to provide a recommended concentration of 1.75 ppm
*June 23, 2014*

**chemistry**

Calculate the atomic mass of naturally occurring molybdenum (Mo) which contains the following isotopes. Isotope Abundance (%) Atomic mass (a.u.) 92Mo 15.8 91.91 94Mo 9.0 93.90 95Mo 15.7 94.91 96Mo 16.5 95.91 97Mo 9.5 96.91 98Mo 23.5 97.91 100Mo 9.7 99.91
*June 22, 2014*

**math**

If 50ml of a 7.5% (w/v) sodium bicarbonate injection are added to 500ml of a5% dextrose injection , what is the percentage strength (w/v)of sodium bicarbonate in product?
*June 22, 2014*

**math**

Apharmacist incorporates 6g of coal tar into 120g of a5% coal tar ointment calculate the percetage (w/w) of coal tar in finshed product
*June 22, 2014*

**Math**

Thank you so much !
*June 20, 2014*

**Math**

Can someone help me with this question? It's urgent..
*June 20, 2014*

**Math**

Remove one value from the following data to make each statement true. 32,45,82,99,15,102,75,15,15,75,2,75 a)The mean is 56.09 How do you know the removed value makes it true?
*June 20, 2014*

**Math**

Thank you
*June 20, 2014*

**Math**

In a skating competition, the marks of judges are randomly selected to count. Then the highest and lowest marks are dropped, and the skater receives the mean of the remaining marks. There are some of the marks that 11 judges gave a skater for a free-skating program. 6.75, 6.25...
*June 20, 2014*

**physics**

A rifle bullet with a mass of 16.5 g traveling toward the right at 285 m/s strikes a large bag of sand and penetrates it to a depth of 22.6 cm. Determine the magnitude and direction of the friction force (assumed constant) that acts on the bullet.
*June 18, 2014*

**POL 201 week 1 Quiz**

Question : In John Locke’s social contract, we Student Answer: submit to the absolute authority of the sovereign. INCORRECT donate all our property to the aristocracy. can rebel against the sovereign whenever we want. CORRECT exchange our absolute liberty for political ...
*June 9, 2014*

**POL 201 week 1 Quiz**

Question 1.1. In John Locke’s social contract, we (Points : 1) submit to the absolute authority of the sovereign. donate all our property to the aristocracy. can rebel against the sovereign whenever we want. exchange our absolute liberty for political freedom. Question 2...
*June 9, 2014*

**Pre algebra**

this place sucks
*June 8, 2014*

**physics**

a pendulum is swinging back and forth once every 1.25 second, how much longer should the pendulum be to increase its period by 0.200 second
*May 16, 2014*

**Geometry**

if v = (1, 2) and w = (3, -4) find the coordinates of 4v - w
*May 14, 2014*

**Geometry**

if the angle of rotation with respect to lines l and m measures 30 degrees, then l and m intersect to form an angle of how many degrees? is it 30 degrees?
*May 14, 2014*

**Geometry**

im thinking its D?
*May 13, 2014*

**Geometry**

which of the following applies to the graph of y = -2x + 4? a. m = -4; y-intercept = 2 b. m = 2; y-intercept = -4 c. m = 4; y-intercept = -2 d. m = -2; y-intercept = 4 thank you!
*May 13, 2014*

**chemistry**

Radioactive decay is a process that follows first-order kinetics. The half-life of 32P is 0.03920 years; how long (in minutes) would it take for the amount of 32P to decrease to 53.25% of its initial amount? I don't understand at all what to do here
*May 11, 2014*

**Chemistry**

How can I determine the overall electrochemical reaction that proceeds spontaneously? Cd2+ | Cd, Co2+ | Co 1. Cd+Co2+ −¨Cd2++Co 2. Co+Cd2+ −¨Co2++Cd (1. and 2. are answer choices)
*May 11, 2014*

**Chemistry**

Yes, and there is no water involved.
*May 11, 2014*

**Chemistry**

Given the Na+/Na and K+/K half-cells, determine the overall electrochemical reaction that proceeds spontaneously and the E0 value. Answer in units of V Can you please explain the steps?
*May 11, 2014*

**physics**

the length of nylon rope from which a mountain climber is suspended has a force constant of 1.40*10^4. how much would this rope stretch to break the climbers fall if he freefall 2.00 m before the rope run out of slack
*May 4, 2014*

**physics**

suppose the length of a clock's pendulum is increased by 0.01 exactly at noon what time will be exactly next day by noon
*May 4, 2014*

**physics**

The formation of condensation on a glass of ice water causes the ice to melt faster than it would otherwise. If 8.00 g of condensation forms on a glass containing both water and 200 g of ice, how many grams of the ice will melt as a result? Assume no other heat transfer occurs.
*April 27, 2014*

**physics**

if 20g of steam at 100 c is mixed into 80 g of water at 20 c what is the final temperature if no heat lost
*April 27, 2014*

**Math**

What is the Schlafli Notation?
*April 27, 2014*

**Chemistry**

For the formation of ammonia, the equilibrium constant is known to be 5.2 × 10^−5 at 25◦C. After analysis, it is determined that [N2] =3M and [H2]=0.8M, both at equilibrium. How many grams of ammonia are in the 10L reaction vessel at equilibium? Use the ...
*April 27, 2014*

**Chemistry**

The compound M2X3 has a molar solubility of 0.0190 M. What is the value of Ksp for M2X3? Here are the choices: 1. 3.52 × 10^-6 2. 4.12 × 10^-5 3. 8.91 × 10^-8 4. 2.48 × 10^-9 5. 2.67 × 10^-7
*April 27, 2014*

**Chemistry**

So I disregard the temperature?
*April 27, 2014*

**Chemistry**

At 25C, an equilibrium mixture of gases con- tains 0.00680 mol/L PCl3, 0.0290 mol/L Cl2, and 0.00500 mol/L PCl5. PCl5(g) ⇀ ↽ PCl3(g) + Cl2(g) What is the equilibrium constant for the reaction? How would I do this? I'm so confused!
*April 27, 2014*

**grammar**

Does it have to be about a specific topic, or can we use any words? ex: Food for he letter F.
*April 27, 2014*

**Chemsitry**

If Kc = 6.38 × 105 for the reaction A(g) ⇀ ↽ 2B(g), what is Kc for the reaction written as 2B(g) ⇀ ↽ A(g)? How would I solve this?
*April 26, 2014*

**Chemistry**

NH4NO3(s) ¡æ N2O(g) + 2H2O(§¤). How much water is produced if 22.9 g of N2O is produced in this reaction? Answer in units of g I converted grams of N2O to mol. Then I did a mol ratio getting mol of H2O. Then I converted mol of H2O to grams. I got 18....
*April 26, 2014*

**Chemistry**

How many of the following changes would alter the numerical value of the equilibrium constant Kp for the reaction 2OF2(g) ⇀ ↽ O2(g) + 2F2(g)? I) an increase in temperature II) a decrease of the container volume III) adding more O2 at constant volume IV) adding a ...
*April 26, 2014*