Monday
May 25, 2015

# Posts by JENNIFER

Total # Posts: 2,106

Physics
a ray of light is incident on an air-glass boundary at 30 degrees. The index of refraction of air is 1,and the index of refraction for the glass is 1.4. What is the angle of the reflected ray, and what is the angle of the refracted ray? Thanks in advance. Been stuck for three ...
May 18, 2015

Algebra
A rectangle has a width which is 2/3 of its length. Find its length if its perimeter is 80 cm. Find its dimensions. P = 2L + 2W 80cm = 2L + 2 (2/3)L 80cm =6/3 L + 4/3L 80cm = 10/3 L 80. 3/10 = L 24cm =L or L= 24 cm W = 2/3 .24 W = 16 cm
May 16, 2015

Social Studies
What did Isaac Singer do to improve American society? and what did he do that may not have been so good? Isaac Singer invented a way to make improvements to the sewing machine in an effort to boost up the sewingn industry and to create a better reliable way of sewing clothes. ...
April 27, 2015

The villages
(x+3)/(x^2-2x-8)- (x-5)/(x^2-12x+32)
April 27, 2015

Physics
A 20 C charge experiences a 2 N force in an electric field. What is the strength of the electric field?
April 27, 2015

Technical Physics
Consider a hypothetical situation, where your friend suggests leaving the refrigerator door open to help cool the house on a hot summer day. Discuss what will happen to the temperature of the room. Will it decrease, increase, or stay the same and why?
April 24, 2015

Physics
A 3.40 kg block of copper at a temperature of 74 °C is dropped into a bucket containing a mixture of ice and water whose total mass is 1.20 kg. When thermal equilibrium is reached the temperature of the water is 14 °C. How much ice was in the bucket before the copper ...
April 23, 2015

Physics
You will use the formula p*V = kB*N*T to find the depth of the box (front to back measurement). The volume of the box is given by the formula V = W * H * D. (You will need to convert the pressure from atm to Pa, or pascals, by multiplying atms by 1 * 105.) The height of the ...
April 19, 2015

phyiscs
Water flows through a 4 cm diameter garden hose at a velocity of 2 m/s. What is the velocity of the water if a nozzle is used with a diameter of 0.5 cm? please help..thanks in advanced
April 16, 2015

Physics 2
Calculate the maximum height using the initial speed, half-time, and angle. The initial speeed is 9.8m/s, half time is 1.8, and the angle is 75.
April 13, 2015

Physics
Calculate the maximum height using the initial speed, half-time, and angle. The initial speeed is 18m/s, half time is 1.8, and the angle is 75
April 13, 2015

Science
A Herculean bomber jet accepts 40kg of air per second at a velocity of 200m/s, burns 2kg of fuel at the same time,and releases exhaust gases at 600m/s relative to the bomber. find the thrust due to its engine.
April 12, 2015

music
seems to justify a departure from traditional presentations of music and culture of the Caribbean?
April 11, 2015

math
Water is falling on a surface, wetting a circular area that is expanding at a rate of 9 mm2 /s. How fast is the radius of the wetted area expanding when the radius is 120 mm? (Round your answer to two decimal places.)
April 10, 2015

math
A rectangular field is to be enclosed on four sides with a fence. Fencing costs \$8 per foot for two opposite sides, and \$2 per foot for the other sides. Find the dimensions of the field of area 900 ft2 that would be the cheapest to enclose.
April 10, 2015

music
What is denoted by "Caribbean music in a new mode."
April 10, 2015

math help
how do prove that this equation has rational roots for all rational values of K 3x^2+kx-k=3x
March 31, 2015

IT
Build a PowerPoint ® presentation that will address each of the Project Management Areas of Knowledge, the process groups that use these areas of knowledge, and how the process groups interact with the knowledge area processes. Use table 3-1, Project Management Process ...
March 30, 2015

literature
I hear the locomotives rushing and roaring, and the shrill steamwhistle. What do the s and sh sounds suggest? What do the r sounds suggest?
March 30, 2015

literature
why is the poem "Fable for when there's no way out" a good example of "seeing common things in an uncommon way?"
March 30, 2015

literature
what lines show alliterations in the poem "Fable for when there's no way out"
March 30, 2015

What type of study would be appropriate for this situation: Determine whether regular meditation will help depression.
March 24, 2015

Physics
A 4.5-kg brick is suspended by a light string from a 2.0-kg pulley. The brick is released from rest and falls to the floor below. The pulley may be considered a solid disk of radius 1.5 m. What is the linear acceleration of the brick and the tension in the string?
March 23, 2015

Physics
A 180-kg uniform horizontal beam is attached to a vertical wall at one end and is supported by a vertical cable at the other end making an angle of 30 degree above the x axis. What is the magnitude of the tension in the cable?
March 23, 2015

Physics
A uniform plank of length 4.1 m and weight 240 N rests horizontally on two supports, with 1.1 m of the plank hanging over the right support. To what distance x can a person who weighs 445 N walk on the overhanging part of the plank before it just begins to tip?
March 23, 2015

trig
If cos A= -6/7, in quadrant 2, determine the exact value of tan 2A I don't understand how to do this?
March 22, 2015

If cos A= -6/7, in quadrant 2, determine the exact value of tan 2A I don't understand how to do this?
March 22, 2015

math
My car gets 26 miles per gallon, I have to drive 36 miles, gas price is \$3.10 per gallon. How much money will I need?
March 20, 2015

Life orientation
List two ways in which sport can support nation building
March 20, 2015

Algebra
Please check my answer and let me know if it is right or not. 25+.32m(800)=281 28+.30(400)=148 70+40+2(30+.29)=830 +.29m
March 15, 2015

physics
The drive propeller of a ship starts from rest and accelerates at 2.90×10-3 rad/s2 for 2.10×103 s. For the next 1.40×103 s the propeller rotates at a constant angular speed. Then it decelerates at 2.30×10-3 rad/s2 until it slows (without reversing ...
March 9, 2015

physics
The sun has a mass of 1.99 × 1030 kg and is moving in a circular orbit about the center of our galaxy, the Milky Way. The radius of the orbit is 2.3 × 104 light-years (1 light-year = 9.5 × 1015 m), and the angular speed of the sun is 1.1 × 10-15 rad/s. ...
March 9, 2015

physics
A motorcycle, which has an initial linear speed of 6.6 m/s, decelerates to a speed of 2.1 m/s in 5.0 s. Each wheel has a radius of 0.65 m and is rotating in a counterclockwise (positive) direction. What are a) the constant angular acceleration (in rad/s^2) and b) the angular ...
March 9, 2015

Physics
An explosion breaks an object initially at rest into two pieces, one of which has 2.0 times the mass of the other. If 7300 J of kinetic energy were released in the explosion, how much kinetic energy did the lighter piece acquire?
March 5, 2015

Physics
A cue ball traveling at 0.70 m/s hits a stationary 8-ball, which moves off with a speed of 0.23 m/s at an angle of 39° relative to the cue ball's initial direction. Assuming that the balls have equal masses and the collision is inelastic, at what angle will the cue ...
March 5, 2015

Physics
Object A is moving due east, while object B is moving due north. They collide and stick together in a completely inelastic collision. Momentum is conserved. Object A has a mass of mA = 17.0 kg and an initial velocity of VoA = 8.15 m/s, due east. Object B, however, has a mass ...
March 5, 2015

Physics
During a workout, the football players at Rutgers State University ran up the stadium stairs at a steady pace in 48 s. The stairs are 135 m long and inclined at an angle of 35 degree. If a typical player has a mass of 120 kg, estimate the average power output on the way up. ...
March 5, 2015

Physics
A car of mass 1490 kg traveling at 22 m/s is at the foot of a hill that rises 115 m in 3.2 km. At the top of the hill, the speed of the car is 12 m/s. Find the average power delivered by the car's engine, neglecting any frictional losses.
March 5, 2015

Impulse and Momentum
A bullet of mass m is fired at speed v0 into a wooden block of mass M. The bullet instantaneously comes to rest in the block. The block with the embedded bullet slides along a horizontal surface with a coefficient of kinetic friction . What is the algebraic expression ...
March 1, 2015

Impulse and Momentum
In the game of billiards, all the balls have approximately the same mass, about 0.20 kg. The cue ball moving west with a speed of 4.5m/s strikes another ball at rest. After the collision the cue ball moves at an angle of 55degree north of west and the other ball at an angle of...
March 1, 2015

Impulse and Momentum
A 1400-kg car traveling east at 25m/s collides with a 1800-kg car traveling at a speed of 20m/s in a direction that makes angle of 40degree south of west. The cars stick together after the collision. What is the magnitude and direction of the velocity of the cars after the ...
March 1, 2015

accounting
Describe how the separation of (1) authorization of production transactions, (2) recording of these transactions, and (3) physical custody of inventories can be specified among the production, inventory, and cost accounting departments. How does the production order document ...
February 27, 2015

Algebra II
what is an equation of a parabola with the given vertex and focus? Vertex: (-2,5); focus: (-2,6)
February 26, 2015

math
Given the equation y equals one third x + 7 what would it be easy y value for the corresponding x value of 18
February 26, 2015

Physics
How to determine the work done on the object with a FCosTheta(Y axis)-Displacement(X axis) graph.
February 23, 2015

Physics
At an accident scene on a level road, investigators measure a car's skid mark to be 68 m long. It was a rainy day and the coefficient of friction was estimated to be 0.40. Using the work-energy theorem determine the speed of the car when the driver slammed on (and locked) ...
February 22, 2015

Physics
A rescue helicopter lifts a 70 kg person straight up by means of a cable. The person has an upward acceleration of 0.70 m/s2 and is lifted from rest through a distance of 9 m.  What is the tension in the cable?  How much work is done by the tension in the cable...
February 22, 2015

algebra
sarah is twice as old as katie. 10 years ago, the sum of their ages was 23. How old are they now
January 14, 2015

science
What is Eugenics and what were the goals and policies of the American Eugenics movement?
January 13, 2015

Math- algebra
If a ball is thrown directly upward with a velocity of 26 ft/s, its height (in feet) after t seconds is given by y = 26t − 16t^2. What is the maximum height attained by the ball? -Please just post answer if possible, my calculations are off. Just want to make sure I am ...
December 17, 2014

Science
Why are there variations in atmospheric pressure how was this proven? Why do your ear pop when trebling to different altitudes?
December 15, 2014

Math
When Curtis was born, his parents began depositing \$1000 at the end of every year into an annuity to save for his college education. If the account paid 7% compounded annually for the first 10 years and then dropped to 5% for the next eight years, how much is the account worth...
December 11, 2014

Math
Thank you by the way! I appreciate it.
December 11, 2014

Math
Yes, that was right. I must have put in the wrong numbers at first when I was doing it so I thought I was using the wrong formula.
December 11, 2014

Math
Young and Company owes bond holders \$5,500 interest at the end of each quarter for the next five years. How much must they deposit now at 8% interest compounded quarterly to yield an annuity payment of \$5,500? -- I am pretty sure I know how to do the problem but I am just ...
December 11, 2014

Chemistry
You read a reversible reaction from left to right in the forward direction. This direction shows which of these occurring? a) the reactants forming a product b) the product decomposing to form reactants c) both a and b occurring d) b occurring, followed by a e) none of the ...
December 8, 2014

Help with Statistics (T-value and decision rule)
For a random sample of 12 observations, the sample mean was 407 and the standard deviation was 6. Using the .05 significant level, answer the following questions. What would the t value be? What is the decision rule? **** I think the t-value would be t = -3.0845 Any help would...
December 5, 2014

I know the answer to the first one is "e" and the answer to the second one is "a "but I have no idea why please explain how to do these two problems. I am very confused with this new method. Thank you! The “Cobb-Douglas” productivity function for ...
December 5, 2014

Physics
The brakes of a bike (with a person) having a mass of 63 kg, reduces it's velocity from 8.5 m/s to 0 m/s in 3.0 seconds. What is the magnitude of braking force?
December 5, 2014

Physics
super mouse steals a large piece of cheese by rolling it across the floor with a force of 5.0 N. If the cheese has a mass of 50 kg with what acceleration does the cheese move? If super mouse's force remains constant, what will be the speed of the rolling cheese
December 5, 2014

I know the answer to the first one is "e" and the answer to the second one is "a "but I have no idea why please explain how to do these two problems. I am very confused with this method. Thank you! The “Cobb-Douglas” productivity function for a ...
December 5, 2014

Physics
A 31.5 N object is in free fall. What is the magnitude of the net force which acts on the object? Answer in units of N
December 4, 2014

Chemistry
so if I multiply the mL to the solution how does that give me the moles of propanioc acid? and what about the glycerol?
December 3, 2014

Chemistry
If 325mL of a 0.58 M solution of a propanoic acid (a fatty acid) was mixed with excess glycerol what is, the maximum number of molecules of fat or oil that could result?(you will need Avogadros number = 6.022 X 10 to the 23rd power)....I need to show all work and im completely...
December 3, 2014

Physics
A 4.26 kg block starts up a 33.0 degree incline at 7.81 m/s. How far will it slide if the coefficient of kinetic friction is 0.23?
November 30, 2014

What is the best estimate of the population mean?
The Jolliebee hamburger chain specializes in half-pound hamburgers. The sales follow a normal distribution. The standard deviation of the distribution for daily sakes is \$3000. A sample of 40 showed the mean daily sale to be \$20,000. What is the best estimate of the population...
November 30, 2014

science
how many moles of oxygen gas are necessary to form 0.737 moles of carbon dioxide
November 24, 2014

Please check my answers and let me know if I did something wrong. Thank you! Find the partial derivative of x, and the partial derivative of y, then the partial derivative of x (1,-1), and the partal derivative of y (1,-1). f(x,y) = x^4 y^2 -x here is what I got @f/@x = 3x^3 y...
November 20, 2014

I was asked to: Calculate the d value or effect size for A but use this data instead. A. Group one 12 and group two 11 standard deviation 3 Can anyone please help me figure out how to find the d value. Any help would be great.
November 20, 2014

Honors Science
Why would vinegar be expressed in liters and milliliters?
November 16, 2014

I think I have the right answer, but I am not 100% sure how to do the values at (1,-1) and the one below at (0,-1, 1). Please explain how I need to approach how to do these. Thank You! Calculate the partial derivative @f/@x, @f/@y and @f/@x | (1,-1), and @f/@y | (1,-1) f(x,y...
November 13, 2014

I think I have the right answer, but I am not 100% sure how to do the values at (1,-1) and the one below at (0,-1, 1). Please explain how I need to approach how to do these. Thank You! Calculate the partial derivative @f/@x, @f/@y and @f/@x | (1,-1), and @f/@y | (1,-1) f(x,y...
November 13, 2014

calculus
A large container has the shape of a frustum of a cone with top radius 5 m, bottom radius 3m, and height 12m. The container is being filled with water at the constant rate 4.9 m^3/min. At what rate is the level of water rising at the instant the water is 2 deep? the finial ...
November 8, 2014

Calculus
Sorry Mr Steve I submitted your answer and It was wrong answer the right answer = 14.0 cm/min Could You please tell me how to do this question because I have to do it again with different values.
November 7, 2014

Calculus
A large container has the shape of a frustum of a cone with top radius 5 m, bottom radius 3m, and height 12m. The container is being filled with water at the constant rate 4.9 m^3/min. At what rate is the level of water rising at the instant the water is 2 deep?
November 7, 2014

Calculus
Can someone please walk me through the steps, I am just not sure what to do next. thanks Solve the optimization problem. Minimize F = x^2 + y^2 subject to xy^2 = 16 I took the derivative F = 2x + 2Y but I don't know where to go from here.
November 6, 2014

I am so confused on how to set this up then solve please help. For a rectangle with area 100 to have the smallest perimeter what divisions should it have? Would I use 2L+2W=P, A=xy, or what. I know it is probably something really simple and I am just not seeing it.
November 6, 2014

Pre-Calc
THANK YOU!!
November 3, 2014

Pre-Calc
A radioactive isotope has a half life of 8.1 days. If the sample starts with 25 grams, how much will there be after 90 days?
November 3, 2014

Please tell me if this are right. Thank you! Find the exact location of all the relative and absolute extrema? h(t) = t^3 - 3t^2 domain: [-1, + infinity) For this one I got x=2 as the minimum, and x=0 as the maximum. g(t) = 3t^4 - 16t^3 + 24t^2 +1 domain: (-infinity, +infinity...
October 30, 2014

Math
Marginal revenue the weekly revenue from the sale of emeralds at Eduardo’s Emerald Emporium (EEE) is decreasing at a rate of \$500 per \$1 increase in price and the price is decreasing at a rate of \$0.45 per additional emerald sold. What is the marginal revenue? I am not ...
October 21, 2014

chemistry
Twenty grams of aluminum metal at 83.2 C were mixed with 49.3 g of water at 19.7 C. Assuming no heat loss, what was the final temperature of the Aluminum water metal? specific heat for Al= 0.215 specific heat for H2O=1.00
October 15, 2014

Statistics
the assets (in billions of dollars) of the four wealthiest people in a particular country are 39, 32, 11, 10. assume that samples of size n = 2 are randomly selected with replacement from this population of four values
October 10, 2014

Math
find three consecutive positive odd integers such that the sum of the squares of the first and second integers is equal to the square of the third integer minus 7?
October 9, 2014

Compute the indicated derivative. d/dt [ ( t^2 + t^0.5 ) ( t^0.5 - t^-0.5 ) ] |t=1 I took the f and g prime then I used the quotient rule my final answer came out to 3t^1.5 - 1.5t^0.5 + t + 0.5t^-1 then I plugged 1 in for t and got 5.196 Please let me know if this is right, if...
October 9, 2014

probability;math
A card is chosen at random from a deck of 52 cards It is then replaced and then a second card is chosen.What is the probability of choosing a jack and then an eight?
October 5, 2014

chemistry, biotechnology
The question is: "The molar extinction coefficient of pure antibody is 1.4 absorbance units per milligram antibody @280nm. You have a concentrated antibody solution, so you make a 5-fold dilution and measure @280, getting an absorbance of 0.845. What is the concentration ...
October 2, 2014

science, chemistry, biotechnology
"You're creating a standard curve for pyruvate. You need to create a standard with 20 micromoles in a cuvette. How much 100 mM pyruvate would you need?" My understanding is to solve for VOLUME using the equation: micromoles = (mM)(volume in ml) 20 micromoles = (...
October 1, 2014

math
Mr snider is tiling a floor .The floor is 16 tiles long and 5 toles wide.How many tiles are in the border section?
September 29, 2014

CHM 300
Experiment: Redox titration;determination of ascorbic acid by an iodometric back-titration Why is sodium carbonate added to the thiosulfate solution ? why is the water used for preparing the thiosulfate solution boiled ?
September 26, 2014

algerbra
I need some help please 7/10 / 1/8+4/5*1/2
September 23, 2014

understanding motion science
it takes a runner 10 seconds to run 100 yards. the runners speed is ?
September 2, 2014

medical billing and coding
a 12 year old boy presents with his father to er due to open wounds to his arm, hand, and upper leg. the injury occurred when the boy fell on a barbed-wire fence at farm while running in the field. Diagnosis: multiple lacerations to the right forearm, right hand, and left ...
August 30, 2014

Voabulary
How can we hope to a city that is surrounded by such strong walls and has ample supplies of everything it needs?
August 21, 2014

english
in general on what stage of the writing process should you spend most of your time a. analyzing your audience b .writing your first draft c prewriting d.revising your material
August 13, 2014

penn foster paralegal
i need help with the following i need the info to be for OHIO LAWS Participants Sally Bright asked her husband, John, to move out temporarily due to marital difficulties. After a brief separation, Sally filed for divorce and received temporary custody of their 14-year-old ...
August 4, 2014

math
Five points lie in the same plane with no three points on the same line. A circle can be drawn through any three of the five points. What is the total number of different circle that can be drawn such that each circle passes through three of the five points?
July 25, 2014

Algebra
You are walking away from home at a constant velocity of 5 km per hour. The first landmark you see is your favorite fountain which happens to be 2 km from your house. Which of the following sequences describes the distances you cover at internals of one hour starting when you ...
July 15, 2014

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