Wednesday

July 29, 2015

July 29, 2015

Total # Posts: 942

**PHYSICS**

Write 5 multiple-choice exam questions on any topics of your choice. A good question should be of sufficient difficulty and perhaps have a good background story? Try to change questions you've seen previously? Post your favorite question to the blackboard discussion board
*July 9, 2015*

**PHYSICS**

In 2286, Admiral Kirk and his crew were forced to use the sling shot effect in a stolen Klingon Bird-of-Prey to travel back in time to the late 20th century to retrieve two humpback whales. The stolen Klingon Bird-of-Prey traveled towards the sun at a velocity of v, while the...
*July 9, 2015*

**Economics**

welfare payments are simply forms of financial aid or support given to an economic sector (or institution, or individual) generally with the aim of promoting economic and social policy. they are payments provided by the government mostly in developed countries e.g US to the ...
*July 9, 2015*

**PHYSICS**

Consider holding a carton of milk in your hand, as shown in the image. The force of the bicep muscle acts at an angle of 15 o to the vertical, while the weight of the arm and the milk both act downwards. The distance from the elbow to where the bicep muscle is attached via the...
*July 9, 2015*

**PHYSICS**

Consider a series of integers a1< a2<... < a43 < a44 that are all positive and all of the numbers are taken to be less than 125. There are 43 differences between adjacent numbers in this series defined as,di= ai+1 - ai . Can you prove that some value of the ...
*July 9, 2015*

**PHY 1**

You hold a hose at 45 degrees to the horizontal and at a height of 1 m from the floor. The water reaches a maximum distance of 10 m from where you are standing. Now you place your thumb over the end of the hose to occlude the opening by 80%, which in turn reduces the flow rate...
*July 9, 2015*

**PHY 1**

In 2286, Admiral Kirk and his crew were forced to use the sling shot effect in a stolen Klingon Bird-of-Prey to travel back in time to the late 20th century to retrieve two humpback whales. The stolen Klingon Bird-of-Prey traveled towards the sun at a velocity of v, while the...
*July 9, 2015*

**PHYSICS**

Consider a series of integers that are all positive and all of the numbers are taken to be less than 125. There are 43 differences between adjacent numbers in this series defined as, . Can you prove that some value of the differences (which must also be positive integers) must...
*July 9, 2015*

**Calculus**

I have a graph of f(x) which I cant post here, but would like some help with concepts. lim f(x) = L x->a I already found the limit for different values of a. Now I need to find the value of f(a) at each point. So is f(a) = lim f(x) x->a So f(a) is just the same value of ...
*July 7, 2015*

**Calculus**

The velocity of a ball that has been tossed vertically in the air is given by v(t) = 16 − 32t, where v is measured in feet per second, and t is measured in seconds. The ball is in the air from t = 0 until t = 2. Determine the value of v'(1). What are the units on the...
*July 6, 2015*

**Chemistry**

Sorry, figured it out. 1.00E-5 x [476/(1240)]= 3.84E-6
*July 5, 2015*

**Chemistry**

A student mixes 764 mL of water and 476 mL of 1.00 x 10-5 M orange food dye solution. What is the concentration of this new dilute solution of orange food dye?
*July 5, 2015*

**Algebra 2**

Consider the leading term of the polynomial function. What is the end behavior of the graph? Describe the end behavior and provide the leading term. -3x5 + 9x4 + 5x3 + 3
*July 3, 2015*

**pre-calculus 11 **

I have a question that two ski decide to have a race. I need show a graph of height versus time of the two skiers going over a jump. I am assuming that both skiers graphs would be parabola's and have a maximum height with both graphs opening downward.
*June 16, 2015*

**pre-calculus 11**

The infinite series 1+3x +9x^2 +27x^3+.. has a sum of 4.The value of x is? so if 1/1-r I substitute 1/1-3x =4 so x=1/4 if someone could confirm that my answer is correct? thanks so much
*June 16, 2015*

**pre-calculus 11 **

The question is the roundtrip flight from Edmonton to Toronto covers a distance of 5400km in 7.6 hours. The speed from Edmonton to Toronto was 95 km/h faster than the speed from Toronto to Edmonton. What was the speed of the plane from Toronto to Edmonton? If i set up my ...
*June 16, 2015*

**pre-calculus 11 **

-x/(x-3) + 2x/(x+2) (x-1) x (x-2) (x+2)/(x-3)(x-3) my question is should i multiply first and then do the adding or subtracting thru a LCD or should i do the adding first?
*June 16, 2015*

**pre-calculus 11 **

a launch window of 8:00 to 12:00. If t represents the launch time then what is an acceptable range of values for launch times? My thoughts are on this is that the scientist have a window of 4 hours which can include 8:00 and 12:00 but cannot exceed them. So time could be ...
*June 16, 2015*

**pre-calculus 11**

an object has a mass of m= 3x/4x^2 and density of d=x-1/2^2 where ve m/d and state any restrictions on the variable. So this simplifies to v=3x/2x-2 my question is the restriction i have found is x cannot be 1 which would make the denominator zero. Do I have to be concerned ...
*June 15, 2015*

**pre-calculus 11 **

I have the question y=-|x^2 -9| I am asked for the piecewise function. I have written y={-x^2 +9 if x less than equal to -3} { x^2 -9 if x is greater than equal to 3} I am wondering if I have my are signs backwards.My reasons for choosing the signs I have is if I plug a ...
*June 14, 2015*

**pre-calculus 11 **

I am asked to solve the absolute value equation of |1/2x +1| =x+1 graphically. I can solve this algebraically and consider two cases for the absolute value one being positive and the other negative. I know this will be a straight line and when I solved it algebraically x=0 the...
*June 14, 2015*

**pre-calculus 11 **

I have f(x) + 1/ x-c this is the question and I am told for the function with a vertical asymptote at x=1 Mr. Reimy was kind enough to provide this information comparing it to y = 1/x for the first interpretation the graph of y = 1/x would simply be translated vertically by c ...
*June 10, 2015*

**pre-calculus 11 **

I have the question what is the equation of the function in the form f(x) = 1/x-c for the function with a vertical asymptote at x=1? sketch the graph. I am uncertain how I plug this into a graphing calculator. Could I substitute 1 for x and then put an x in for c to input this...
*June 10, 2015*

**pre-calculus 11 **

I am asked to solve the absolute value equation of |1/2x +1| =x+1 graphically. I can solve this algebraically and consider two cases for the absolute value one being positive and the other negative. I know this will be a straight line and when I solved it algebraically x=0 the...
*June 10, 2015*

**pre-calculus 11 **

I have the question y=-|x^2 -9| I am asked for the piecewise function. I have written y={-x^2 +9 if x less than equal to -3} { x^2 -9 if x is greater than equal to 3} I am wondering if I have my are signs backwards.My reasons for choosing the signs I have is if I plug a ...
*June 10, 2015*

**math**

is the statement |f(x)|= f|(|x)| always true, sometimes true or never true use examples. If f(x) means the function of x then it means the absolute value of the function of x equals the function of the absolute value of x. I do not know how to provide examples but I believe ...
*June 9, 2015*

**pre-calculus 11**

abs x^2/2 -1 =x+3 solve algebraically so if I divide thru by 2 i get x^2 -2= 2x+3 simplifying x^2-2x-5 =0 solve by quadratic formula to get =3.449 and -0.445 both of which are extraneous roots if I take negative then I get -x^2 +2=2x+6 simplify to x^2 +2x +4 if taking using ...
*June 9, 2015*

**Linear quadratics and inequalities**

parabolic path that can be reprsented by the function y=-0.1x^2 +2.9x, where x represents the horizontal distance and y represents the vertical distance of the football. As the ball is rising, a Louisanna lineman jumps in a linear path that can be represented by the equation y...
*June 1, 2015*

**physics**

two forces act on an object, force A id 8.7N and force B is 12.9N. The angle between the two forces is 125 degrees. what is the net force on the object?
*May 28, 2015*

**math**

An oil painting is worth $400. Its value increases by 7% each year compounded annually. What is the value of the painting after 6 years (using the formula A=P(1 + i)^n
*May 18, 2015*

**math please help**

i dont understand what @Steve means
*May 18, 2015*

**math please help **

An oil painting is worth $400. Its value increases by 7% each year(compounded annually) What is the value of the painting after 6 years? How would the graph change of the initial value of the oil painting was more than $400? Less than $400?
*May 18, 2015*

**math please help**

An oil painting is worth $400. Its value increases by 7% each year(compounded annually) What is the value of the painting after 6 years? How would the graph change of the initial value of the oil painting was more than $400? Less than $400?
*May 18, 2015*

**Algebra**

Need help solving the system of inequalities and equations graphically for this problem. Please help! 6y=9(x-6) 3(2y+5x)=-6
*April 3, 2015*

**Programming 1**

1.Do the planning and write an algorithm to solve the following problem. Prepare test data for the example to test all possibilities and draw a trace table. Sam works at a coffee company where all the employees receive a bonus of R700, except the employees in the coffee ...
*April 1, 2015*

**please help Chemistry**

Zn(OH)2 was saturated in a solution of sodium hydroxide. The following equilibra exist under these conditions Zn(OH)2 -> Zn2+ +2OH- Ksp Zn2+ +OH- -> Zn(OH)+ K1 Zn(OH)- + OH- -> Zn(OH)2 K2 Zn(OH)2 + OH- -> Zn(OH)3- K3 Zn(OH)3- +OH- -> Zn(OH)42- K4 a) Sum of which...
*March 26, 2015*

**chemistry**

Zn(OH)2 was saturated in a solution of sodium hydroxide. The following equilibra exist under these conditions Zn(OH)2 -> Zn2+ +2OH- Ksp Zn2+ +OH- -> Zn(OH)+ K1 Zn(OH)- + OH- -> Zn(OH)2 K2 Zn(OH)2 + OH- -> Zn(OH)3- K3 Zn(OH)3- +OH- -> Zn(OH)42- K4 a) Sum of which...
*March 26, 2015*

**Geometry**

The area of a rectangular space is 128 square feet. What are the possible pairs of whole number dimensions in feet?
*March 25, 2015*

**Math**

a. Which values from the set {1, 2, 3,4} are solutions of (line _ this > )2x +5) Show your work? b. which values from the set {1,2,3,4} are solutions of 11 > 2x + 5? Show your work. How are your answer from parts a and b different? How can I tell the answers are ...
*March 12, 2015*

**Physics**

What is the centripetal acceleration in meters per second squared of a point on the rim of a circle with a radius of 0.45 meters and turning at a rate of 1200 rpm?
*March 12, 2015*

**Chemistry**

What is the pH of a solution prepared by mixing 500mL of 2.0M HCN (Ka= 4.9x10^-10) with 500mL of 1.0 M KOH?
*March 10, 2015*

**physics**

how much force is required to stop a 100 mi/hr fastball? Assume the catcher's mitt stops the ball in 1 millisecond and the mass of a baseball is 145 g.
*March 7, 2015*

**history**

what does respective strengths mean
*March 5, 2015*

**history**

I looked and I couldn't find any I need 3 points for each side
*March 5, 2015*

**history**

what are the respective strengths of WTLC(workers) and the opponents (management) in the Winnipeg general strike? please provide full answers
*March 5, 2015*

**Computer Science**

"write a program that asks the user to enter the price of an item and rate of discount. If discount is 9%, display the final cost of item" What message do I display if its not 9%? Algorithms btw
*February 15, 2015*

**Physics**

Two point charges of +1.0 uC and -2.0 uC are located 0.50 m apart. What is the minimum amount of work needed to move the charges apart to double the distance between them? (k=8.99x10^9Nm^2/C^2)
*February 12, 2015*

**Math**

100/64= 1.5625 subtract by 1 move decimal
*February 12, 2015*

**Algebra**

Tom has a $20 bill, a $10 bill, a $5 bill, and $1 bill. List the total costs possible for items he could buy if he receives no change.
*February 1, 2015*

**061555RR**

knutson company reacquired 5,000 shares of its $15-par common stock for $13/share. the debit to treasury stock is
*January 22, 2015*

**Math**

The temperature one spring day was 78 degrees. Starting at 1:15 pm the temperature drops 0.25 degrees per minute. What temperature will it be at 1:25 pm? Do I divide 0.25/1:25 to get the answer?
*January 22, 2015*

** Math**

Raymond puts the money he inherited in an investment that earns 4.4% per year, compound semi-annually. After 12 years his investment had grown to $35,402.06. Raymond then invested the $35,403.06 at 5% per year, compound quarterly for the next 5 years.
*January 21, 2015*

**calculus **

A 15-ft ladder rests against a vertical wall. If the top of the ladder slides down the wall at a rate of 0.33 ft/sec, how fast, in ft/sec, is the bottom of the ladder sliding away from the wall, at the instant when the bottom of the ladder is 9 ft from the wall? Answer with 2...
*January 17, 2015*

**calculus**

i dont see it
*January 17, 2015*

**calculus **

A rectangular box has a square base with an edge length of x cm and a height of h cm. The volume of the box is given by V = x2h cm3. Find the rate at which the volume of the box is changing when the edge length of the base is 12 cm, the edge length of the base is decreasing at...
*January 17, 2015*

**calculus **

If f(x) = ι(x2 - 8)ι, how many numbers in the interval 0 ≤ x ≤ 2.5 satisfy the conclusion of the mean value theorem? (4 points) Three Two One None
*January 16, 2015*

**calculus **

The surface area, S, of a sphere of radius r feet is S = S(r) = 4πr2. Find the instantaneous rate of change of the surface area with respect to the radius r at r = 2. (4 points)
*January 16, 2015*

**Life and world**

I need a idea of an art work response to the contemporary world it can be war violence politics or anything else im not very creative please help
*December 29, 2014*

**physics**

Save Two children hang by their hands from the same tree branch. The branch is straight, and grows from the tree trunk at an angle of 27 degrees above the horizontal. One child, with a mass of 39 kg is hanging 1.50 m along the branch from the tree trunk. The other child, with...
*November 17, 2014*

**calculus inverted cone **

A container in the shape of an inverted cone has radius 6 ft and height 12 ft. It is being drained at 2〖ft〗^3/min. Find the rate of change of the height of the liquid in the cone when the height is 3 feet. The ratio of the radius to the height remains constant.
*November 11, 2014*

**calculus**

Steve is wrong the correct answer is 10m = 1/5 rad/s and 40m = 1/8 rad/s
*November 9, 2014*

**Math**

Use inverse trigonometric functions to find a solution to the equation in the given interval. Then find solutions? cos x = -0.6 , 0<= theta <=2pi Give your answers in increasing order. Round your answers to two decimal places x = x =
*November 8, 2014*

**Math Trig Please Help!!!**

Find exact values for all the solutions to the equation cos theta = sqrt 3/2 for -2pi <= theta <= 2pi Theta = Theta = Theta = Theta =
*November 7, 2014*

**Algebra**

Thank you so much!!
*October 18, 2014*

**Algebra**

Factor (y+2)^2-81
*October 18, 2014*

**physics**

5.8kg bag of groceries is in equilibrium on an incline of 34deg. the acceleration of gravity is 9.81m/s^2. What is the magnitude of the normal force on the bag?
*October 5, 2014*

**chemistry**

When 34.1 g of lead reacts with 6.81 L of oxygen gas, measured at 1.00 atm and 25.0°C, 36.1 kJ of heat is released at constant pressure. What is DH° for this reaction?
*October 5, 2014*

**chemistry**

The following equation represents the partial combustion of methane, CH4. 2CH4(g) + 3O2(g) > 2CO(g) + 4H2O(g) At constant temperature and pressure, what is the maximum volume of carbon monoxide that can be obtained from 3.39 x 102 L of methane and 1.70 x 102 L of oxygen?
*October 4, 2014*

**Statistics**

Each day a local radio station randomly draws a date (without replacement) from a bowl containing all the days in the year. The first person who calls in with their birthday on the date drawn gets a prize. what is the probability that none of the birthdays selected in the ...
*September 14, 2014*

**algebra 2**

A newspaper claims that 52% of voters will vote for a particular candidate in an upcoming election. A random survey of 1000 voters shows that 48% will vote for that candidate, with a standard deviation of 3%.
*August 1, 2014*

**mechanics**

You can take the system of calendar-magnet and you have : W1+W2-T=(m1+m2)*a=> T = 1.05 N Then, T=ì*N=>N=10.5N must be the answer you are looking for.
*July 6, 2014*

**Physics**

The Achilles tendon is attached to the rear of the foot as shown in (Figure 1) . A person elevates himself just barely off the floor on the "ball of one foot." Assume the person has a mass of 65kg and D is twice as long as d. Find the tension FT in the Achilles ...
*June 10, 2014*

**Physics**

What is the maximum tension possible in a 1.15 mm diameter nylon tennis racquet string? The ultimate tensile strength for nylon is 5.00×10^8N/m2.
*June 10, 2014*

**PennFoster**

when a european coffee maker becomes less expensive to buy in the united states, you could probably say that we're experiencing a
*June 9, 2014*

**science **

An object is thrown up with a velocity 30m/s. If the acceleration due to gravity is 10m/s2. Cal. I) its velocity after 2s. II) the maximum height reaches. III) the time taken for the take object to come to rest.
*June 3, 2014*

**physics**

that is what i thought
*April 14, 2014*

**physics**

A 15.4g bullet traveling at 270 m/s is fired into a 0.488kg wooden block anchored to a 100 N/m spring. How far is the spring compressed? x_{compressed} = If the speed of the bullet is not known but it is observed that the spring is compressed 43.9 cm, what was the speed of ...
*April 14, 2014*

**Algebra**

Hockey teams reciever 2points when they win and 1 point when they tie. One season, a team won a championship with 64 points. They won 11 more games than they tied. How many wins and how many ties did the team have ?
*April 13, 2014*

**Algebra**

The formula r=2sqrt(...)5L can be used to approximate the speed r, in miles per hour, of a car that has left skid marks of length L, in feet. How far will a car skid at 70mph?
*April 2, 2014*

**Social Studies**

Identify two problems resulting from urban sprawl in the western region of the United States. If these problems are not solved, what will the outcome likely be? Pls i really need help D:
*March 29, 2014*

**probability**

fX(x)={5,0,if 0≤x≤0.1 or 0.9≤x≤1,otherwise. fY(y)={1,0,if 0≤y≤1,otherwise. Let W=X+Y. The following figure shows a plot of the PDF of W. Determine the values of a, b, c, d, e, f, and g. a= 1 b= 0.5 c= 0.1 d= 0.9 e= 1.1 f= 1.9 g= 2
*March 28, 2014*

**probability**

For 0<z<1, fZ(z)= z For 1<z<2, fZ(z)= 0.5
*March 28, 2014*

**Global Studies**

What? This is my name.. But a?
*March 27, 2014*

**Global Studies**

All of the following affect climate EXCEPT a. vegetation b. elevation c. location d. wind patterns <<<
*March 27, 2014*

**Ethical Dilemmas/Criminal Justice**

which statement about hypothetical imperatives is true?
*March 23, 2014*

**statistics**

From experience, an airline knows that only 80% of the passengers booked for a certain flight actually show up. If 8 passengers are randomly selected, find the probability that fewer than 7 of them show up.
*March 20, 2014*

**Physics**

A 5.36 kg object falls freely (ignore air resistance), after being dropped from rest. Determine the initial kinetic energy, the final kinetic energy, and the change in kinetic energy for the following. (a) first meter of fall initial kinetic energy 0 J final kinetic energy ___...
*March 8, 2014*

**Physics**

A penny rests on top of a bowling ball. You give the bowling ball a slight bump and the penny slides off the frictionless, spherical surface as shown below. At what angle θ does the penny leave the surface of the bowling ball? (Hint: When the penny leaves the surface, the...
*March 8, 2014*

**math**

Five houses, next door to each other, are on the even side of the road. They are all three digit numbers and the largest is a perfect cube.The second lowest is a triangle number.
*March 3, 2014*

**Physics**

You are going to toss a rock straight up into the air by placing it on the palm of your hand(you are not gripping it) then pushing your hand up very rapidly. Draw a free body a diagram for the rock for each situation, and write the sum of equation based on the free body ...
*February 17, 2014*

**Global Studies (Please help)**

So you are saying its Colorado?
*February 3, 2014*

**Global Studies (Please help)**

What ashley?
*February 3, 2014*

**Global Studies (Please help)**

which of the following was neither part of the confederacy nor the union? a. Minnesota b. Texas c. Michigan D. Colorado
*February 3, 2014*

**Language Arts**

Which is the correct MLA citation for a magazine article? A. Brian Carson. "The Real Story Behind Bigfoot." Myths and Legends Mar. 2010:20. Print. ****** B. Carson, Brian. "The Real Story Behind Bigfoot." Myths and Legends Mar. 2010:20. Print. C. Brian ...
*February 3, 2014*

**Psychology**

What is the relative frequency of sample means above 101.5?
*February 2, 2014*

**Math**

Danny has a yard in the shape of a parallelogram: width- (50 m) length- (60 m) height- (60 m) he want to split it into 3 pieces, with more than one type of shape. they should all have equal perimeter. the perimeter can not be in decimals. (Help please)
*February 2, 2014*

**Business Math **

. Compute the rate for the following loan. Round your answer to the nearest tenth of a percent. Principal Rate (%) Time Interest $50,000 9 months $4,500 (Points : 2)
*January 5, 2014*

**Physics**

A small block slides along a track from one level to a higher level, by moving through an intermediate valley (see Figure). The track is frictionless until the block reaches the higher level. There a frictional force stops the block in a distance d. Assume that the block's...
*December 26, 2013*

**Physics**

Place a small rubber ball on top of a basketball or soccer ball and then drop them together. If vertical alignment nicely remains as they fall to the floor, you’ll see that the small ball bounces unusually high. Can you reconcile this with energy conservation?
*December 8, 2013*

**Astronomy**

Do you do anything on your own??
*December 5, 2013*