Total # Posts: 3,796
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
1. The right to private and family life is limited by the law regulating marriage under traditional customs, which recognise parental consent and age restriction on who is of marriageable age. 2. Right to is restricted by the law which forbids a citizen from killing himself or...
April 6, 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
Joanna Pauly was delighted to see that her ROI ﬁgures had increased for the third straight year. She was sure that her campaign to lower costs and use machinery more efﬁciently (en- abling her factories to sell several older machines) was the reason why. Joanna ...
March 14, 2015
A child on a beach tosses a walnut straight upward. it reaches the peak of its trajectory and then falls straight downward retracing its path when a hungry seagull grabs the walnut 10.1m above the release point at a time of 1.6s after it was thrown. find the initial velocity ...
March 5, 2015
A 100kg object moving at 20 m/s comes to a stop over distance of 40 m. What is the coefficient of dynamic fiction between the object and the ground? I tried to work it out with the formula, but I'm really confused. Please help.
March 2, 2015
A cylinder has a height of 16 cm and a radius of 5 cm. A cone has a height of 12 cm and a radius of 4 cm. If the cone is placed inside the cylinder as shown, what is the volume of the air space surrounding the cone inside the cylinder? (Use 3.14 as an approximation of ð.)
March 2, 2015
A library has fiction and nonfiction books. 2/5 of the library books are fiction. Of these 1/5 are mysteries. 1/3 of the nonfiction books are mysteries. What fraction of all the books are mysteries?
February 26, 2015
GDP rises from $4 trillion in 2006, the base year, to $5 trillion in 2012. The GDP deflator in 2012 is 120. Find real GDP in 2012. Find the percentage increase in real GDP between 2006 and 2012.
February 25, 2015
Problem 6-1 Bank Reconciliation The following information is available to assist you in preparing a bank reconciliation for Calico Corners on May 31, 2012: a. The balance on the May 31, 2012, bank statement is $8,432.11. b. Not included on the bank statement is a $1,250 ...
February 22, 2015
. Which of the following social structures is NOT reflected in the act of a wife adopting her husbands name and foregoing her fathers (her maiden) name? (Points : 1) Patriarchy Heteronormativity Hierarchy Classism
February 12, 2015
Particles of charge +65, +48, and −95 μC are placed in a line. The center one is L = 60cm from each of the others.Calculate the net force on the left charge due to the other two.
January 31, 2015
Hi! I was just wondering if one of the teachers could tell me whether or not it is unprofessional to wear colored contact lenses to a college interview? The colors aren't drastic colors but they are contact lenses nonetheless. thanks!
January 30, 2015
I have to calculate the vapor pressure of water at 25.0 degrees celicus. The heat of vaporization of water is 40.65 kj/mol and the vapor pressure of water is 92.7 Torr at 50 degrees celcius. I know I should use log10 P=A- B/C+T but I don't know how to work it out.
January 30, 2015
I am looking for the number of ways you can draw 4 marbles to have an equal number of red and white marbles after the draw. I was using combination probability set up as 6C2*7C2 = 315 but this doesn't include the probability of the 5 blue marbles. I'm not sure how to ...
January 24, 2015
A bag contains 6 red, 7 white and 5 blue marbles, how many ways can four marbles be picked where there are an equal number of red and white marbles? Is it 315 ways?
January 24, 2015