Friday
February 12, 2016

Posts by kevin

Total # Posts: 1,091

Social Studies
Why do we celebrate black history month?
February 11, 2016

math
Thanks!
February 9, 2016

math
Problem: Lexington, and Elizabethtown, Kentucky are 79 miles apart. If the distance on the map is 2 1/2 inches, find the scale of the map. do i make a ratio for inches to miles? is it 2.5x inches = 79 miles?
February 9, 2016

pre-calclus
State the amplitude, period, phase shift, and vertical shift of the function y= -3 (1/2x- 2/3 pi)-4
February 7, 2016

Chemistry
The molarity of concentrated HCl purchased for laboratory use is approximately 12.1 M. How many milliliters of this reagent should be diluted to 1.000 L to make 0.100 M HCl?
January 19, 2016

dynamics
(a) A rocket is travelling out of the earth’s atmosphere. During flight it burns fuel at a rate of 80kg/s producing a constant thrust of 500kN which drives the rocket in a vertical trajectory. It has a mass of 3500Kg when it reaches a speed of 1220m/s. At this point in ...
December 29, 2015

Statistics
ln a box of 200 computer chips 30 of them are defective. lf 3 chips are chosen at random with replacement, what is the probability that at least one of them is defective?
December 15, 2015

chemistry
the number of moles in 12.04x10^23 molecules of Oxygen
December 12, 2015

Walk two moons
What is the meaning of the fourth message in your own words?
December 9, 2015

health
What are the ten building blocks for total health
December 8, 2015

chemistry
Stoichiometrics: a 36 grams sample of calcium hydroxide is allowed to react with 40.5 grams of phosphoric acid according to the following reaction. 3Ca(OH)2 + 2H3PO4 = Ca3(PO4)2 + 6H2O how many grams of calcium phosphate are produced? how many moles of Calcium phosphate are ...
December 5, 2015

chemistry
a 36 grams sample of calcium hydroxide is allowed to react with 40.5 grams of phosphoric acid according to the following reaction. how many grams of calcium phosphate are produced? how many moles of calcium phosphate are produced? how many moles of excess reagent remain? if 43...
December 5, 2015

chemistry
a 36 grams sample of calcium hydroxide is allowed to react with 40.5 grams of phosphoric acid according to the following reaction.
December 5, 2015

Chemistry
Calculate the final temperature in degrees Fahrenheit of 1.25 liters of gas X at 85 degrees Celsius and 2700 mm/Hg, if the pressure is changed to 2.35 atmospheres and the volume is increased to 2500ml
December 4, 2015

Chemistry
if 16.5 liters of gas X is at 398 torr and -90.5 degrees celsius, what would be the volume of this same gas if the pressure is changed to 3.1 atmospheres and the temperature is changed to 399K
December 4, 2015

Physics
A stone is aimed at a cliff of height h with an initial speed of v = 36.0 m/s directed 75.0° above the horizontal, as shown in the Figure below by the arrow. The stone strikes at A, 6.25 s after launching. What is the height of the cliff?
December 3, 2015

Chemistry
50g*1mol/26.04g*2molh20/1molC2H2*18.02g/1molh20 69.20g H20 needed to make 50g c2h2
December 1, 2015

physics
So in projectile problems horizontal a=0 so the velocity is constant. So finding x and y components for initial velocity X: 172.5m/s*cos30=149.4m/s Y: 172.5m/s*sin30=86.25m/s The max height is at the apex of the projectile, so use vertical velocity in Vfy =Viy+at---> -vi/a=...
December 1, 2015

physics
A projectile is fired at 30.0° above the horizontal. Its initial speed is equal to 172.5 m/s. Assume that the free-fall acceleration is constant throughout and that the effects of the air can be ignored. What is the maximum height reached by the projectile? At what time ...
December 1, 2015

Physics
A person who is 1.1 m tall throws a ball with a speed of 5.2 m/s at an angle of 56 degrees above the horizontal. What are the x and y components of the velocity (in m/s) of the ball the instant before it strikes the ground? The acceleration due to gravity is 10 m/s2
December 1, 2015

Physics
The launching speed of a certain projectile is 6.8 times the speed it has at its maximum height. Calculate the elevation angle at launching.
December 1, 2015

Physics
A catapult on a cliff launches a large round rock towards a ship on the ocean below. The rock leaves the catapult from a height H = 32.0 m above sea level, directed at an angle theta = 46.9° above the horizontal, and with a speed v = 29.6 m/s. Assuming that air friction ...
December 1, 2015

Science
Well I'm not sure if you need it in MKS system or not but here is the conversion 66km/hr*1hr/60min*1min/60sec*1000m/1km =18.06m/s or .01806km/s Since the car is stopping its final velocity =0 Use the equation Vf=Vi+a*t (Where vf is final velocity vi is initial velocity a ...
December 1, 2015

physics
Hmm, I may be overlooking something here, unless the mass is irrelevant, but I drew Y0=0 V0=8.1m/s VF=0m/s( because the jumper reached Yf stops and comes back down toward earth) and a=9.8m/s^2 so you're looking for Y final position I used Vf^2=V0^2+2a(Yf-Y0) since vf=0 and...
December 1, 2015

PHYSICS
So this gives you the mass and force of m1, use Newton's second law (F=m*a) to get the acceleration.... 33.0/4.5kg=7.33 m/s^2 I drew this situation as [m1]----[m2] since the applied force was to the right the --- tension force becomes limp and should =0 [m1]>~~_[m2] it...
December 1, 2015

math
A: FUNCTION Q1. (a) The function C (x) = 25x + 80,000 express the total cost C (x) (in K£) of manufacturing x units of a product. If the maximum number of units which can be produced equals 20,000, state the restricted domain and range for this function. (b) An analysis ...
December 1, 2015

math
Well50k-27k=23k So since 8.5%interest is on Corp bonds 27000*.085=2,295 23,000*.068=1,564 3,859$ is the most he makes from interest Since it says maximum income look at the maximum amount he count spend on the higher interest rate then subtract from the total he wants to spend...
December 1, 2015

Chemistry
pH=Pka+log[A-]/[HA] Pka=-log 1.8x10-5 +log (.025/.053) Divide the concentrations out and take the log of it and add it to the negative log of 1.8x10-5 You can tell HC2H3O2 is the acid because Ka is the constant for the acid, while Kb would be constant for the base. I don't...
December 1, 2015

biology
Which of the following organelles is common to both prokaryotic and eukaryotic cells? Cytoskeleton Nucleus Nucleolus
November 30, 2015

algebra
A wire is 264 ft in length is to be cut into two pieces, one to form a rectangle whose length is four less than twice the width, and the other to form a square whose side is equal to the sum of the width and the length of the rectangle. how long is the shorter piece of wire
November 29, 2015

c programming
Write a program to read from a file called "input.txt" information about 5 workers. Each line would contain two values respectively, an employee ID and the employee's monthly salary. Assume that the data from the input file is stored in a format as shows in this ...
November 26, 2015

Calculus
Let f(x)=5x^(9/5)−45x^(4/5). Find the largest open interval(s) where f(x) increases.
November 23, 2015

Math
Let f(x) be a function such that f′(x)=x(ln|x|)^2. Find the open interval(s) in which f(x) is concave down . In interval notation, f(x) is concave down in ___________
November 23, 2015

Algebra
James walked 212 miles in 23 of an hour. What was his average speed, in miles per hour?
November 21, 2015

conversions
How to calculate the square meters of a roll that is 30500 LF x 117" x 75 gauge
November 20, 2015

Physics
A thin spherical shell of silver has an inner radius of 8.74 x 10-2 m when the temperature is 29.4 °C. The shell is heated to 145 °C. Find the change in the interior volume of the shell.
November 15, 2015

Physics
A copper (shear modulus 4.2 x 1010 N/m2) cube, 0.324 m on a side, is subjected to two shearing forces, each of magnitude F = 6.93 x 10 5 N (see the drawing). Find the angle (in degrees), which is one measure of how the shape of the block has been altered by shear deformation.
November 14, 2015

Grammar check
Hello, can you please check my answer. Which of the following sentences is written in the subjunctive mood? A. If the sun is shining, then I will wear sandals. B. It was the weekend, so she slept until noon. C. My health teacher recommends that I eat five servings of ...
November 11, 2015

Math
A marketing research firm wishes to determine if the residents of Caldwell, Idaho, would be interested in a new downtown restaurant. The firm selects a simple random sample of 120 phone numbers from the Caldwell phone book and calls each household. Only 62 of those called are ...
November 9, 2015

Statistics
A marketing research firm wishes to determine if the residents of Caldwell, Idaho, would be interested in a new downtown restaurant. The firm selects a simple random sample of 120 phone numbers from the Caldwell phone book and calls each household. Only 62 of those called are ...
November 9, 2015

Statistics
Researchers wish to determine if a new experimental medication will reduce the symptoms of allergy sufferers without the side-effect of drowsiness. To investigate this question, the researchers give the new medication to 50 adult volunteers who suffer from allergies. Forty-...
November 9, 2015

physics
Two blocks with masses M1 = 8.0 kg and M2 = 5.4 kg are connected with a massless string over two massless and frictionless pulleys, as shown in the Figure. One end of the string is connected to M1 while the other end is fixed. What is the acceleration of mass M2?
November 4, 2015

Sixth grade math
The sum is 1.7 and the product is 6.3. What are the numbers?
November 3, 2015

LA check work
ok thank you for the second question I believe it would be A then
November 3, 2015

LA check work
Hello could you check my work on these two questions? Question one: How do you form the perfect tense of a verb? A. use the helping verb will and the base form of the verb B. use a form of the verb have and the present particle of the verb C. use a form of the verb have and ...
November 3, 2015

algebra
With an 80 km/h head wind a plane can fly a certain distance in 4 h. Flying in the opposite direction, with the same wind blowing, it can fly that distance in one hour less. What is the plane’s speed?
November 2, 2015

Calculus III
What is the velocity vector of a particle traveling to the right along the hyperbola y=x−1 with constant speed 1 when the particle's location is (4, 14). (Use symbolic notation and fractions where needed. Give your answer in the form of comma separated list of i, j ...
October 22, 2015

math homework
Find the all the possible values for x if there are any so that the graph of the function has a horizontal tangent. y(x)=x^4-4x+4
October 18, 2015

English
What's the correct capitalizations for, the henderson family moved to chicago from the east coast.
October 5, 2015

English
thank you very much.
September 24, 2015

English
Hello which sentence is correct? I'm not sure. as I had learned much from garfield high school. or I have learned much from Garfield high school. Should I use had or have? thank you
September 24, 2015

Math.
A jet is travelling at 600 miles per hour. Determine the velocity of the jet in meters per second
September 21, 2015

Physics
An aerialist on a high platform holds onto a trapeze attached to a support by an 9.8-m cord. (See the drawing.) Just before he jumps off the platform, the cord makes an angle of 37° with the vertical. He jumps, swings down, then back up, releasing the trapeze at the ...
September 17, 2015

math
The track is 1/8 a mile
September 15, 2015

math
Jacob is jogging around a track. Th track is a mile. How many laps will he have to jog to make 3 miles? Is it 24 laps
September 15, 2015

english 9
Who was Mary Elizabeth Lease?
September 8, 2015

math
x-54
September 8, 2015

english 9
What was the goal of the Americanization movement?
September 8, 2015

World Geography
1.5
September 2, 2015

algebra
Price # of pizzas 1.50 1 3.00 2 4.50 3 6.00 4 each pizza costs 1.50 so you add on 1.50 to each slice of pizza you buy
September 1, 2015

math
Find x 1) 6log(down)10 x=1.6 2) e^-4x=1.943 3) 1.3x10^-4 x=4.7/x -6.3x10^-3 4) 6lnx=1.6 5) x^2¡Ñ23y^2 = 1.78x10^32¡Ñz please help I really can't solve this problem.
August 30, 2015

Science
It's essential to remember acceleration as a vector ( having magnitude/size and direction) So the plane taking off is the easy one to mark off, a cheetah running 27m/s east could be assumed it's speed is constant and not accelerating, a car stopping at a stop sign has ...
August 27, 2015

Science
Which of the following is not an example of acceleration. A a person jogging atn3 m/s along a winding path B a car stopping at a stop sign. C a cheetah running 27m/s east D a plane taking off
August 27, 2015

math
Sandra wants to buy some chocolates as a gift to her friend . Each bar of chocolate is worth Php. 75.00 Question : a.Write the equation . b.What is the constant of variation ? c.How much did she pay if she buy 7 bar of chocolates ?
August 25, 2015

physics
A cyclist is at rest at a traffic light. When the light turns green, he begins accelerating at 2.13 m/s2. How many seconds after the light turns green does he reach a cruising speed of 5.05 m/s?
August 22, 2015

math sqrt root
1) x¡Ô2x + 2¡Ô2x^3 + 2x^2/¡Ô2x Ans 4x¡Ô2x 2) (1/2)^1/3 Ans 3¡Ô1/2 = 3¡Ô4 /2 3) ¡Ô2/3 Ans ¡Ô6/3 4) 3¡Ô2/3 Ans 3¡Ô18/3 5) ¡Ô2 + 1/¡Ô2 ...
August 18, 2015

math
2/9 divided 15/4 divided 4/12
August 14, 2015

physics
The mass of meter stick= 151.77g but with 3 sig figs it's roughly 152grams (47.7g)*(38.5cm-10.5cm)=(47.3cm-38.5cm)*(Mass of meter stick) Simple algebra given the information, hope this helps!
July 29, 2015

sociology
Studies show that people from higher socioeconomic backgrounds tend to live longer and report feeling healthier than people from the lower classes. What are some explanations for this phenomenon? please help
July 28, 2015

sociology
How does one¡¦s place in the socioeconomic system affect their ability to achieve the American Dream?
July 28, 2015

psychology
<11{1[4(23)23]}> People have claimed that Jamie’s paintings have given them the blues. Clearly this cannot be entirely correct, since many of Jamie’s paintings contain no blue at all. The argument above is flawed because the author:
July 9, 2015

sociology
can you copy and paste some information for me please? I couldn't get access to sing up for that website.
July 7, 2015

sociology
Every discipline that does research on humans needs a code of ethics in order to protect its research subjects. While it¡¦s easy to see that medical research could harm people if not carried out ethically, the risks associated with sociological research are more ...
July 7, 2015

science
A force of 16.0 newtons is sufficient to set a box that is at rest into motion. If the coefficient of static friction is 0.380, what is the normal force acting on the box?
June 24, 2015

biochemistry
anyone by any chance know what it means for a protein to be "n-terminally truncated"? I know that the n-terminus is supposed to be like one end of the protein chain...
June 14, 2015

math
A motor pulley 8 inches in diameter and runs at 450 revolutions per minute.Find the diameter of the fan if the RPM's is 1,400? Round to the nearest hundredth.
June 8, 2015

Computer Lit
Does this look good? It's about Piracy and my position. Computer Piracy What is piracy? Are there pirates running around on the Internet? Piracy is theft, you’re stealing copyrighted work. You’re not stealing if you buy a book, a song on iTunes, or a movie off of...
June 4, 2015

Spanish
thank you
May 27, 2015

Spanish
Hello how would I say"There are plants around the lake" in spanish.
May 27, 2015

Pseudocode
Produce the algorithm for the problem above [this will include five “get” statements to input item 1, item 2, item 3, item 4 and item 5; three math statements to process the subtotal, tax and total; and three “display” statements to output the subtotal, tax...
May 11, 2015

Chemistry
My teacher is an idiot and wont teach our class and im panicking so please help anyone. Given the following equations enthalpy values, determine the heat of reaction (kj) at 298k for the reaction: B2H6(g)+6Cl(g)=2BCl3(g)+6HCl(g)
May 10, 2015

10th grade physics
What speed must a bucket of water have to complete a circle with a radius of 1.2 m without spilling any water? My answer: this seems to be an incomplete question, not solvable without the weight of the bucket
May 1, 2015

English vocab
If you receive someone's mail, then you seize it before the person receives it; however, it is illegal to take someone's mail, so the police might attempt to arrest you and put you in jail.
March 27, 2015

English
Can you find the word passage which matches the meaning given. (a) knocked about, pushed off balance (b) another choice
March 25, 2015

Physics
A 130kg mail bag hangs by a vertical rope 3.9m long. A postal worker then displaces the bag to a position 2.2m sideways from its original position, always keeping the rope taut.
March 21, 2015

Shakespear
what is the mood of anticipation?
March 21, 2015

Physics
A 130kg mail bag hangs by a vertical rope 3.9m long. A postal worker then displaces the bag to a position 2.2m sideways from its original position, always keeping the rope taut.
March 21, 2015

Math
Hi! I need help with this question. Thanks! Directions: Try to find the number of solutions for the following system of equations then determine if it is Dependent, Inconsistent or Consistent. -3x-2y=6 x=-2-2/3y
March 18, 2015

Spanish
I'm doing a project. Thats my title which one would be better "Mi futuro hogar" or "Mi futura casa"
March 14, 2015

Spanish
ok thank you
March 14, 2015

Spanish
Hello how do I say "my future house" in spanish. I didnt want to use google translate because of the grammar.
March 14, 2015

physics
A chair of mass 14.0kg is sitting on the horizontal floor; the floor is not frictionless. You push on the chair with a force F = 40.0N that is directed at an angle of 43.0∘ below the horizontal and the chair slides along the floor.
March 14, 2015

Math
A bus can cover a distance of 6 miles in 1 gallon of gas. The cost of gas is $4 per gallon. What will be the cost of gas used in driving the bus for 96 miles?
March 12, 2015

projectile motion physics
There is a minimum angle above the ground such that if the ball is launched below this angle, it can never clear the bar, no matter how fast it is kicked. What is this angle?
March 8, 2015

projectile motion physics
Imagine the ball on the left is given a nonzero initial speed in the horizontal direction, while the ball on the right continues to fall with zero initial velocity. What horizontal speed vx must the ball on the left start with so that it hits the ground at the same position as...
March 8, 2015

physics
wo vectors A⃗ and B⃗ have magnitude A = 3.02 and B = 3.03. Their vector product is A⃗ ×B⃗ = -5.05k^ + 2.06 i^. What is the angle between A⃗ and B⃗ ?
March 7, 2015

Physics
Kaitlin is going off to her physics class, jogging down the sidewalk at a speed of 3.30m/s . Her husband Scott suddenly realises that she left in such a hurry that she forgot her sandwich, so he runs to the window of their apartment, which is a height 35.0m above the street ...
March 7, 2015

Physics
A car comes to a bridge during a storm and finds the bridge washed out. The driver must get to the other side, so he decides to try leaping it with his car. The side the car is on is 19.5m above the river, while the opposite side is a mere 1.6m above the river. The river ...
March 7, 2015

Physics
A 7500kg rocket blasts off vertically from the launch pad with a constant upward acceleration of 2.20m/s2 and feels no appreciable air resistance. When it has reached a height of 595m , its engines suddenly fail so that the only force acting on it is now gravity. [1]What is ...
March 7, 2015

Geometry
I need some assistance, here's the question. 4. What are the values of x and y? A. x=9/4,y=3/4 B. x=9/4,y=15/4 C. x=15/5,y=5/4 D. x=3/4,y=15/4 I'm thinking it's either A or B, but I don't know for sure. Can anyone help?
February 25, 2015

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