Sunday

August 30, 2015
Total # Posts: 83,642

**calculus**

The rate of decay in the mass, M, of a radioactive substance is given by the differential equation dM dt equals negative 1 times k times M, where k is a positive constant. If the initial mass was 100g, then find the expression for the mass, M, at any time t.
*July 17, 2015*

**physics**

you know that s(t) = 4.9t^2 so, it takes x=sqrt(4.5/4.9) seconds to hit. You want s(x) - s(x-1)
*July 17, 2015*

**math**

Simon and Jimmy had 167 stamps altogether. Simon gave 4/7 of his stamps to Trina, and Jimmy gave 37 stamps to Trina. Simon and Jimmy had the same number of stamps left. How many stamps did Jimmy have in the beginning? I need you to show me how you did it because I have trouble...
*July 17, 2015*

**maths**

an electronic device makes a beep after every 60 seconds,another device makes a beep after every 62 seconds.they beep together at 10 am.the time when they will next make a veep together at the earliest is?
*July 17, 2015*

**maths**

i had 30 candies on monday. on wednesday, i have 19. bekka took some from me on tuesday. how much did she take?
*July 17, 2015*

**geometry**

In the accompanying diagram, triangle ABCis similar to triangle DEF, AC = 6, AB = BC = 12, and DF = 8. Find the perimeter of triangle DEF.
*July 16, 2015*

**calculus**

Newton’s law of cooling states that the rate of cooling of an object is proportional to the temperature difference between the object and its surroundings. So the rate of cooling for a bottle of lemonade at a room temperature of 75°F which is placed into a ...
*July 16, 2015*

**Psychology**

1)The Peabody Picture Vocabulary Test-Revised is used to Select one: a. determine a child’s reading level b. determine a deaf child’s understanding of words c. identify people with communication difficulties d. identify children who should skip a grade b 2)Which of ...
*July 15, 2015*

**Psychology**

thanks
*July 15, 2015*

**Psychology**

Which of the following factors will not affect how a person does on an IQ test? Select one: a. How much sleep he/she had the night before b. None of the above c. What kind of mood that person is in d. Whether that person had anything to eat that day I am thinking c.
*July 15, 2015*

**Algebra 2**

Evaluate 20(0.5)^(n-1) when n= 3 to 12. Use sigma notation .
*July 15, 2015*

**Biology**

Breaks down proteins into polypeptides and amino acids What is the component?
*July 15, 2015*

**biology **

Activates conversion of pepsinogen to pepsin. What is the component? What is the secretion?
*July 15, 2015*

**economics**

3. Suppose that the total monthly demand for golf services is given by Q = 20 – P The marginal cost to the firm of each golfer is $1. If this demand function is based on the individual demands of 10 golfers, what is the optimal two part pricing strategy for this golf club...
*July 15, 2015*

**Physics**

The force F sub x acting on a particle is shown as a function of X. If an object starts at the origin (of a graph) moving to the right with a kinetic energy of 45.5 J, how much kinetic energy does it have at x = 3.0 m ? I have no clue how to do about solving this. Any help ...
*July 15, 2015*

**Math**

If 3 pounds of apples costs .99 how much does 2 pounds costs?
*July 15, 2015*

**Math**

What price do we charge a patient if the AWP for 300 tablets is $14.55 and we want to give the patient 30 tablets plus a 6% markup and a $3.00 dispensing fee?
*July 15, 2015*

**Calculus Partial Derivatives**

Verify that the sum of three quantities x, y, and z, whose product is a constant k, is maximum when these three quantities are equal.
*July 15, 2015*

**Economics**

quality, price, competition, substitutions
*July 15, 2015*

**Math**

You need to hire a part-time associate to work 30 hours a week in your store. You have $250 in labor budget for the new associate each week. You just interviewed an excellent candidate for the position who has requested to be paid $9.00 per hour. Your average part-time ...
*July 15, 2015*

**Tobias**

O darn i meant to change my name to Tobias. this is a physics question
*July 14, 2015*

**Tobias**

If a rotating disk starts from rest and ends up at 200 rpm in 4 seconds, what is the angular acceleration? How many revolutions occur during the process? If that same disk, after the power is turned off comes to rest in 20 seconds, what is the angular deceleration?
*July 14, 2015*

**Physics**

The only other bit of information is that the force Fx (represented by the y axis) is presented as a function of X
*July 14, 2015*

**Physics**

If an object starts at the origin (of a graph) moving to the right with a kinetic energy of 45.5 J, how much kinetic energy does it have at x = 3.0 m?
*July 14, 2015*

**math**

mrs.graybought some eggs.she used 1/2 of them to make tars and 1/4 of the remainder to make a cake she had 9 eggs left how many eggs did she buy?
*July 14, 2015*

**PHYSICS**

thanks for your help
*July 14, 2015*

**PHYSICS**

right on those two. doornobs: if the force is fartherest from the hinges, it takes less force to open the door. diection: always perpendiculr to radius of rotation. direction II: acceleation is along radius of rotation directed inward.
*July 14, 2015*

**PHYSICS**

Two equal forces applied to a rotating rod, one very close to the axis and one far from the axis. Which force produces the largest torque? a. the one closest to the axis b. the one furthest from the axis How would you kick a football so that id did not spin end over end? a. at...
*July 14, 2015*

**healthcare**

PowerPoint Presentation: Narrative Presentation to the Board of Trustees The Centers for Medicare & Medicaid Services (CMS) has taken on a more visible role in health care. A great deal of change has transpired to improve patient safety and implementation of additional quality...
*July 14, 2015*

**PHYSICS**

it depends on the potenial on the washer (or the total charges). Electron initial KE=1/2 m v^2 electron initial PE=qV final PE=0 final KE= total initial energy.
*July 14, 2015*

**PHYSICS**

) An electron of mass m and charge q = -e is released with an initial speed v ; from the center of the hole (at the origin) in the upward direction (along the perpendicular axis [0 the washer) experiencing no forces except repulsion by the charges on the washer. What speed ...
*July 14, 2015*

**PHYSICS**

Imagine a soap film (air-soapy water-air) of 1 l,m thickness, and refractive index of 1.5 with white light normal to the film. Which wavelengths in the optical range (400 nm to 700 nm) will appear brightest?
*July 14, 2015*

**science**

Your question is nonsense..you want probability, but you give it by saying one chance in four.... Bb x Bb= BB bb bB Bb so bb is one chance in four.
*July 14, 2015*

**Physics**

period=2PIsqrt(weight/springconstant) solve for spring constant. then weight= kx solve for x.
*July 14, 2015*

**Physics, Eectric flux**

add the charges. flux= net charge/permitivity
*July 13, 2015*

**Psychology**

Sam’s I.Q. was 105 when he was tested at age nine. When he was thirteen, he was re-tested and his I.Q. was 120. Explain the increase in I.Q. using the concepts of trends/theories and socioeconomic factors.
*July 13, 2015*

**criminology**

Cultural explanations for differences in rates of violence and victimization across racial/ethnic categories point to
*July 12, 2015*

**Psychology 20 (HELP)**

haberdasher.hubpages./hub/The-Wild-Boy-of-Aveyron Read the Ages and Stages online journal article, The Wild Boy of Aveyron. 3. What does this case study say about the relative influence of Nature (genetic inheritance) or Nurture (social environment) in terms of human ...
*July 12, 2015*

**math**

Do the following lines intersect? If yes, show the the point of intersection, if any. 5x+8y=-5 -x-1.6y=14 Can someone help me get started? Im stuck. Thanks!
*July 11, 2015*

**vocabulary**

The couple (who were at the wedding) ordered hors d'oeuvres (from a menu, presumably).
*July 11, 2015*

**Science**

thank you so much
*July 11, 2015*

**Calculus Partial Derivatives**

Problem: Find dimensions of a box that provide the greatest volume when the length plus the girth cannot exceed six feet. I tried 2w+2h+l=6, l=6-2w-2h, but couldn't get to w=1, h=1, l=2, which is the correct answer.
*July 10, 2015*

**Math**

3/5
*July 10, 2015*

**changing**

If for a sequence (tn),sn=2n²+5n,find tn and show that the sequence is an a.p
*July 10, 2015*

**Physics**

Add the two components... Et=E1+E1=k4/20^2+k10^2/8^2 negative sign points to minus x axis, so in this case, E is to the right
*July 10, 2015*

**physics**

pressure=force/area=1.5g/.2x.26 Newtons
*July 10, 2015*

**Maths**

there will be no constant term.
*July 10, 2015*

**Physics**

Net north: 3KM net ease 3KM direction=NE magnitude: sqrt(3^2+3^2)
*July 10, 2015*

**Physics**

net north 5Km net East 12 Km distance=sum=17km displacement: sqrt(5^2+12^2) in direction arc tan (5/12) E of N
*July 10, 2015*

**chemistry**

A 250 mL sample of gas at 1.00 atm and 20oC has the temperature changed to 40oC and the volume changed to 500 mL. What is the new pressure?
*July 9, 2015*

**Chemistry**

Yeah it was a typo, there's been a lot of them on my sheet for some reason.
*July 9, 2015*

**Chemistry**

Also, if H2PO2 is tripled, how does that correspond to H2PO, since they're both different compounds? I understand how doubling OH will quadruple it in the rate, I just don't understand how the other go hand in hand.
*July 9, 2015*

**Chemistry**

If it was a qualitative question, how would the question above be reformatted to fit it?
*July 9, 2015*

**Chemistry**

The hydroxide ion reacts with the H2PO2 ion according to the following equation: OH^- + H2PO2^- > HPO2^-2 + H2 The rate law for this reaction rate is R=k[OH^-]^2[H2PO^-2]. What will be the change in the reaction rate if the H2PO2 ion concentration is doubled. What will the ...
*July 9, 2015*

**Science**

So NO will be doubled in the rate and O3 will be tripled.
*July 9, 2015*

**Science**

The rate law for the reaction NO + O2 > NO2 is R=k[NO][O2]. what will be the effect on the reaction rate if the partial pressure of NO is doubled? What will the effect be if the partial pressure of O2 is tripled? My answer: More NO2 would be produced if NO was doubled. If ...
*July 9, 2015*

**Calculus Partial Derivatives**

y=F(x+at) + f(x-at) y=F(w) + f(v) (w=x+at, v=x-at) don't see how to get from here to partial derivative y with respect to t = F"(w)a^2 + f"(v)a^2
*July 9, 2015*

**Physics**

so would it be (2)(9.0e9)(4.64)(Q)/0.707^2
*July 9, 2015*

**statistics**

u=100 and standard deviation of P=20. error between sample mean and population mean of n=16 is 5 points and error between sample mean and population mean for a sample of n=100 is 2 points. explain
*July 9, 2015*

**Science**

Given the following equation: N2 + Cl2 > @ NCL3 H=+230 kJ a) What mass of N2 would absorb 96.5 kJ of heat as it reacts? b) What volume of Cl2 at STP would be required to react with the N2 in part (a)? I do not know how to solve this problem. My mindset is that it involves ...
*July 9, 2015*

**Chemistry**

How is the enthalpy change for a reaction related to the enthalpy of the reactants and products? Is it that the enthalpy for the reactants and products equals the enthalpy change for the reaction?
*July 9, 2015*

**physics**

Charges of 4.0 µC and -6.0 µC are placed at two corners of an equilateral triangle with sides of 0.10 m. At the third corner, what is the electric field magnitude created by these two charges? (ke = 8.99 ´ 109 N·m2/C2)
*July 9, 2015*

**English**

ok, thank you so much :]
*July 9, 2015*

**English**

my assignment is to look for aticle that is related to Papa, the philosopher
*July 9, 2015*

**English**

Papa, the philosopher is a short story of Leo Buscaglia its about a boy who was descriminated for what he is ...
*July 9, 2015*

**English**

can you give me an articles about racism, bullying or etc .. that is related to Papa, The philosopher ???
*July 9, 2015*

**Anthropolgy**

Which of the following is NOT a common result of culture contact?
*July 9, 2015*

**Physics**

A particle travels along the x axis with a constant acceleration of +2.7 m/s2. At a time 4.2s following its start, it is at x = -108 m. At a time 5.7 s later it has a velocity of +13.0 m/s. Find its position at this later time. Please use kinematic equations to solve.
*July 9, 2015*

**Physics**

Two trains face each other on adjacent tracks. They are initially at rest, and their front ends are 30 m apart. The train on the left accelerates rightward at 1.17 m/s^2. The train on the right accelerates leftward at 1.1 m/s^2. (a) How far does the train on the left travel ...
*July 9, 2015*

**Physics**

Two cars are traveling along a straight road. Car A maintains a constant speed of 79 km/h and car B maintains a constant speed of 114 km/h. At t = 0, car B is 36 km behind car A. (a) How much farther will car A travel before car B overtakes it? ? km (b) How much ahead of A ...
*July 8, 2015*

**ENG 125**

What does literature offer an individual? What causes people’s perceptions regarding the value of literature to change?
*July 8, 2015*

**Physics**

I really need help with this problem and I honestly have no clue how only knowing the force and weight will help find the tension if there is no friction.
*July 8, 2015*

**Physics**

The figure is just an inclined plane with two weights, both with a mass of 10kg but labeled M1 and M2 that are attached by a string. The pully is on the top point of the inclined plane and one weight is resting on the inclined plane with the other is hanging off the top point ...
*July 8, 2015*

**Physics**

Two objects are connected by a massless string, as shown in the figure below. The incline and pulley are frictionless. (a) Find the acceleration of the objects. (Assume that positive acceleration is to the right for m1 and downward for m2. Answer using m1 for m1, m2 for m2, g ...
*July 8, 2015*

**math**

Its matrix (3 0) p-p =(-2 0) (3 0) (2 4) value of p Please show your working in matrix
*July 8, 2015*

**math**

Its matrix (3 0) p-p =(-2 0) (3 0) (2 4) value of p
*July 8, 2015*

**ITT**

A 1kg object has a potential energy of 20 J while stationary at the top of an incline. Neglecting friction, what is its speed halfway down the incline?
*July 8, 2015*

**LIFE SCIENCES**

So that people can see them
*July 8, 2015*

**BUSINESS STUDIES**

Q2.Discuss the problems that occur when universities and industry form joint ventures for research purposes.How have these problems been solved?
*July 8, 2015*

**BUSINESS STUDIES**

show diagram of marketing system
*July 8, 2015*

**Physics**

A particle moves in the xy plane with constant acceleration. At time zero, the particle is at x = 6.0 m, y = 3.0 m, and has velocity v = 4.0 m/s + -1.0 m/s . The acceleration is given by the vector a = 4.0 m/s2 + 0 m/s2 . (a) Find the velocity vector at t = 3.0 s. ?( m/s...
*July 7, 2015*

**Calculus AB**

multiply numerator and denominator by (1/x)^(3x+1) Lim ((3+2/x)/(3+4/x))^(3x+1) so as x>>inf this reduceds to ((3/3)^3x+1) and as x>>inf = 1
*July 7, 2015*

**Chemistry-History-ish**

If I were to rewrite this paragraph, should I scratch the first sentence and add it to the bottom with a bit of change in it?
*July 7, 2015*

**Chemistry-History-ish**

Describe 3 experiments, run prior to 1930, and the types of energies/particles used to probe the structure of the atom. What did each experiment investigate? Include the names of the scientists associated with each experiment in your answer Would this be right? Prior to 1930, ...
*July 7, 2015*

**physics**

A race driver has made a pit stop to refuel. After refueling, he starts from rest and leaves the pit area with an acceleration whose magnitude is 6.3 m/s2; after 4.1 s he enters the main speedway. At the same instant, another car on the speedway and traveling at a constant ...
*July 7, 2015*

**pysics**

A metal box attached to a small parachute is dropped from helicopter A.explain in terms of the forces acting on why its velocity increased immediately after being dropped B.why did it reach a uniform velocity after a short distance C.the total force opposing motion of the box ...
*July 7, 2015*

**Chemistry**

Diatomic O2 can react with the element magnesium to form magnesium oxide (MgO). The balanced chemical equation is: If 4 moles of magnesium totally reacted with more than enough O2, how many moles of MgO would be expected to form?
*July 7, 2015*

**statistics**

Average is 8500 with a standard deviation. Of 1500 with a z score of -2.98 a z score of +1.00 what are the actual bonuses
*July 7, 2015*

**chemistry**

Diatomic O2 can react with the element magnesium to form magnesium oxide (MgO). The balanced chemical equation is: If 4 moles of magnesium totally reacted with more than enough O2, how many moles of MgO would be expected to form?
*July 7, 2015*

**Calculus**

Find max or min: y = x * cosx
*July 7, 2015*

**Chemistry**

630 mm Hg
*July 6, 2015*

**Chemistry**

What are the pros and cons of using the lewis structure? What I have so far is that it shows the shape of the compound.
*July 6, 2015*

**Chemistry-Molecular models**

Select a compound and explain the advantages and disadvantages of using ball-an-stick, space-filling, and lewis structure to represent compound. What I have so far: The advantages for all the models are that you can see the shape of the atoms, but unlike the ball-and-stick and...
*July 5, 2015*

**Physics**

Can you do this using a kinematic equation approach?
*July 5, 2015*

**Chemistry**

Explain how the formulas for H2O and NaCl provide different information about the composition of these two compounds. What I think: For every 1 atom of oxygen, there are 2 atoms of hydrogen. For every one atom of sodium there is one atom of chlorine.
*July 5, 2015*

**Psy326**

Random assignment
*July 5, 2015*

**Psy326**

What is a technique for reducing carryover, practice and fatigue effects that involves varying the order of presentation between participants
*July 5, 2015*

**Math**

Veronica rolls a pair of dice twice. On both rolls, the sum is 9. Are these independent events, dependent events, or neither? Explain your answer.
*July 5, 2015*

**Macroeconomics**

Suppose in an economy the nominal money supply is $ 1000, the general price level is 4 and the real output is at its full employment level of $4000. a. what is the price level and velocity of money? b. By assuming constant velocity of money, what would you expect to see the ...
*July 5, 2015*