Total # Posts: 3,719
Iodine, I2, reacts with aqueous thiosulfate ion in neutral solution according to the balanced equation I2(aq)+2S2O2−3(aq)→S4O2−6(aq)+2I−(aq). How many grams of I2 are present in a solution if 33.00 mL of 0.165 M Na2S2O3 solution is needed to titrate the...
October 27, 2015
A body starts from rest and accelerates to a velocity of 5m/s in 20s. It then maintains this velocity for 10s and then decelerates to rest in further 10s. (a) Draw a velocity time graph of the motion (b) Calculate the initial acceleration (iA body starts from rest and ...
October 27, 2015
The thickness of a book is 3.2cm, measured between the insides of it cover. The highest page in the book is 1,096. What order of magnitude estimate does that give the thickness of a page of the book?
October 25, 2015
An artist is commissioned to paint a large painting on a wall. The wall is a rectangle and it measures 87 feet by 65 feet. The artist charges $68 per square yard. The artist gives no discount for any chunk of area less than a square yard. Find the total charge for painting the...
October 23, 2015
An artist is commissioned to paint a large painting on a wall. The wall is a rectangle and it measures )( feet by '& feet. The artist charges $') per square yard. The artist gives no discount for any chunk of area less than a square yard. Find the total charge for ...
October 23, 2015
Yazmin decided to get some exercise by taking the stairs from the first to the fifth floor in her apartment building. The first time she went up the entire flight, she walked up some steps and ran up 16 steps. This took a total of 60 seconds. The second time she went up the ...
October 3, 2015
y = total cost You start at a cost of $50 at zero days, so $50 is your y-intercept (b). Your rate of daily rental is your slope (m), and it goes up at $150 / 1 day. Therefore, for y=mx+b, you would write y = $150x + $50, where x>or = 0
October 3, 2015
Stuarts car loan reached a maturity value of $14001.00 after 3 years. Find the rate on Stuarts loan if the principal he borrowed was $12474.00 Use the formula to find the interest; then use to find the rate in decimal form. Leave your answer in percentage form ...
September 28, 2015
Almonds cost fiver per pound and cashews cost nine per pound. How many pounds of almonds should be mixed with the cashews to make 10 pounds of a mix that sells for eight dollars per pound?
September 23, 2015
As an example of a price index, consider the A.C.D.P.I. (a fictitious price index). The associated basket of goods is: Good Price Coffee $8/lb. Bread $1/loaf Tea $15/lb. Aspirin $2/bottle Cola $6/case A. If the price of coffee doubles, what is the resulting percentage change ...
September 15, 2015
The greatest place value is hundred thousand. The digit in the tens place is 5.the remaining digit ate 2, 3, 8 and 7. One of the digit has a value of 30,000. One of the digit had a value of 800. The value of the digit in the thousands place is 10 times greater than this. There...
August 25, 2015
The greatest place value is hundred thousands. *the digit in the tens place is 5. *the remaining digit are 2,3,8, and 7 *one of the digit has value of 300,000 *one of the digits has a value of 800. The value of the digit in the thousands place is 10 times greater than this. * ...
August 10, 2015
Which one of the following actions would make the maxima in the interference pattern from a grating move closer together? Decreasing the frequency of the laser. Increasing the frequency of the laser. Increasing the number of lines per length. Increasing the wavelength of the ...
August 7, 2015
True or False. If a line L1 has equation y = mx + b, where m and b are constants with m 0,then an equation of a line L2 perpendicular to L1 has the form , where C is a constant. L2: y= -1x +C
August 4, 2015
Sam bought a new car for $26,500. The car depreciates approximately 13% of its value each year. a) What is the decay factor for the value of this car? b) Write an equation to model the decay value of this car?
August 2, 2015
A solid cylinder rolls down an incline plane without slipping. If the center of mass of the cylinder has a linear acceleration of 2.67 m/s2, what is the angle of the incline to the horizontal?
July 21, 2015
A 30.0-kg child sits on one end of a long uniform beam having a mass of 20.0 kg, and a 43.0-kg child sits on the other end. The beam balances when a fulcrum is placed below the beam a distance of 1.10 m from the 30.0-kg child. How long is the beam?
July 9, 2015
A child (48 kg) stands on the edge of a stationary merry-go-round (uniform disk of radius 1.2 m and mass 50 kg). The child jumps off at 1.0 m/s with respect to the ground in the direction tangential to the edge. Find the angular speed of the merry-go-round after the jump. ...
July 9, 2015
Suppose you moved a box across a rough horizontal surface with a 50 N force over a displacement of 10 m. If the frictional force at the interface was 10 N, how much work was done to the box?
July 7, 2015
A study of 600 college students taking statistics revealed that 54 students received the grade of A. Typically 10% of the class gets an A. The difference between this gourp of students and the expected value is not significant at the 0.05 level. What does this mean?
June 23, 2015
Math (Need help Urgent)
1. Fireworks are to be launched from a platform at the base of a hill. Using the top of the platform as the origin and taking some measurements, it was determined that the cross-section of the slope of one side of the hill is y=4x-12 . If the path of the fireworks is y= -x^2+...
June 18, 2015
A 95% confidence interval for the mean of a normal population is found to be 17.6 <h 23.6 (h looking symbol couldn't find on keyboard ) what is the margin of error ? A 2 B 2.7 C 3 D 4 My answer is C. Am I right? But I think it could also be A.
June 16, 2015
The effective speed of the student while going upstream (i.e , the velocity of the student with respect to the river ) is 0.75 m/s whereas the same while returning downstream is 1.45 m/s . So , total time taken = 1000/0.75 + 1000/1.45 = 2023 seconds = 33 minutes 43 seconds . ...
June 11, 2015
12.34 Screening job applicants. A company retains a psychologist to assess whether job applicants are suited for assembly-line work. The psychologist classifies applicants as one of A (well suited), B (marginal), or C (not suited). The company is concerned about the event D ...
May 30, 2015
Sharon made a scale drawing of a triangular park. The coordinates for the vertices of the park are: ( 10, 5) (15, 5) (10, 12) Her scale is 1 unit = 1 meter. What is the area of the triangular park in square meters? How do you find the answer?
May 21, 2015
suppose i guess that the average income of a family is $40,000. Display a test of the hypothesis that the mean of the numerical variable equals the value of the guess given versus the alternative that it does not equal this value. then what would be my decision at the 5% ...
May 17, 2015
An advertisement for a steel-belted radial tire states that this tire delivers 14% better gas mileage. If the present gas mileage is 25.5 mpg, what mileage would you expect if you purchased these tires? Round your answer to the nearest tenth of a mile per gallon. I know the ...
May 7, 2015
Suppose you wish to make a scale drawing of your living room, which measures 18 ft by 23 ft. If the shorter side of the drawing is 6 in., how long is the longer side of the scale drawing?
May 6, 2015
What is the difference between specific heat and heat capacity? If you heat 500g of H2O initially at 8C in a 1000 W microwave with 80% efficiency for 2 minutes, what will the final temperature be?
May 5, 2015
A particle (mass = 5.0 g, charge = 40 mC) moves in a region of space where the electric field is uniform and is given by Ex = 2.5 N/C, Ey = Ez = 0. If the velocity of the particle at t = 0 is given by vy = 50 m/s, vx = vz = 0, what is the speed of the particle at t = 2.0 s?
April 29, 2015
A sample of potassium hydrogen oxalate, KHC2O4, weighing 0.717 g, was dissolved in water and titrated with 18.47 mL of an NaOH solution. Calculate the molarity of the NaOH solution.
April 27, 2015
assume that the odor threshold for untrained noses is normal with a standard deviation of 7. the odor thresholds for these 10 noses are: 31, 31, 43, 36, 23, 34, 32, 30, 20 and 24. is there evidence that the mean threshold for untrained tasters is greater than 25 micrograms per...
April 24, 2015
would the null hypothesis that the 2000 mean hourly earnings of all workers was $16 be rejected at the 10% significance level in favor of the two-sided alternative? What about the null hypothesis that the mean was $15?
April 24, 2015
Jill bought so e carrots and apples for $24.80. A carrot and an apple cost $.90 altogether. She bought more carrots than apples. The cost of the extra number of carrots was $6.80. How many apples did she buy?
April 20, 2015
non profit Accounting
The mayor of a large city approaches a group of citizens and suggests that they form an organization to provide social, educational, and recreational programs for local youth. The group agrees and forms an entity called the Community Youth Organization (CYO). The group also ...
April 19, 2015
A consumer advocacy group claims that the mean amount of juice in a 16 ounce bottled drink is not 16 ounces, as stated by the bottler. Determine the conclusion of the hypothesis test assuming that the results of the sampling lead to rejection of the null hypothesis. A. ...
April 18, 2015
A researcher wishes to estimate the mean amount of money spent per month on food by households in a certain neighborhood. She desires a margin of error of $30. Past studies suggest that a population standard deviation of $248 is reasonable. Estimate the minimum sample size ...
April 18, 2015
with 2 pentagons (A, B, C, D, E) & F, G, H, I, J.) start with A in lower left corner. Same with F. AE=10, BC=8: FG=9, FJ=15. There are diagonal line CE & HJ. x= AB, Y=GH. Find the scale factor of ABCDE to FGHIJ; need value of x & y; perimeter of ABCDE is 38, what is perimeter ...
April 12, 2015
a forest ranger spots a fire from 28-foot tower. the angle of depression from the tower to the fire is 11 degre to the nearest foot, how far is the fire from the base of the tower
April 10, 2015
the world's largest cube puzzle in Knoxville measures 6 feet on each side. The scale factor between a standard cube puzzle and largest is 1/24. Find the surface area and volume of the standard cube puzzle. Answer is 0.375ft^2/0.015625ft^3 Not sure how they figured it out i...
March 27, 2015
If x unit of a product cost C dollars to manufacture and earn revenue of R dollars, the value of X where the expression for C and R are equal is called break-even quantity, the number of units that produce zero profit. Find the break-even quantity when c=14X+48000 and R=18X
March 25, 2015