Questions Asked on
November 8, 2014

  1. Physics

    An object is placed at a distance of 1.5 m from a screen and a convex lens is interposed between them. The magnification produced is 4. What is the focal length of the lens.

    asked by Rajul
  2. Physics

    A billiard ball moving at 5.45 m/s strikes a stationary ball of the same mass. After the collision, the first ball moves at 4.81 m/s, at an angle of 28° with respect to the original line of motion. Find the velocity (MAGNITUDE and DIRECTION) of the second

    asked by Anonymous
  3. Math

    Carlene saves $y. Sharon save 3 times as much money as Carlene. Jason saves $50 more than Sharon. How much do they have altogether?

    asked by Ernesto
  4. Physics

    The spring shown in the figure is compressed 59cm and used to launch a 100 kg physics student. The track is frictionless until it starts up the incline. The student's coefficient of kinetic friction on the 30∘ incline is 0.14 . k= 80,000 N/m m=100 kg uk=

    asked by Dib
  5. Spanish--1 question

    Why is it not always necessary to include a subject pronoun before the verb in Spanish?

    asked by Anonymous
  6. Calculus

    A large container has the shape of a frustum of a cone with top radius 5m, bottom radius 3m, height 12m. The container is being filled with water at the constant rate of 3.9 m^3/min. At what rate is the level of water rising at the instant the water 9 m

    asked by lilia
  7. Physics

    A box of mass m and initial speed v0 slides distance d across a horizontal floor before coming to rest. Use work and energy to find an expression for the coefficient of kinetic friction.Express your answer in terms of the variables v0, d, and free fall

    asked by Dib
  8. Trig

    House B is located at a bearing of N67°E from house A. House C is 370 meters from house A at a bearing of S68°E. House B is located at a bearing of N11°W from house C. Find the distance from house A to house B. (Round your answer to two decimal places.)

    asked by Kate
  9. Physics test review

    A ball is thrown horizontally from the top of a building 30.1 m high. The ball strikes the ground at a point 66.8 m from the base of the building. The acceleration of gravity is 9.8 m/s2 . Find the time the ball is in motion. Answer in units of s Find the

    asked by ann
  10. Algebra

    A kayaker paddles upstream for 1.5 hours then turns his kayak around and returns to his tent in 1 hour. He travels 3 miles each way. What is the rate of the rivers current?

    asked by John
  11. Physics

    A coin is placed on a large disk which rotates uniformly at a rate of 2 rot/s. The coefficient of friction between the coin and the disk is 0.1. To what distance from the center of the disk should the coin be placed so that the coin may not slip? I know

    asked by Anonymous
  12. geometry

    Eddie is arguing with tana about the probability of flipping three coins. They decided to flip a penny, nickel, and a dime. Which would be better determining the sample space, a tree diagram or an area model? Justify your answer.

    asked by lily
  13. 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

    asked by Jennifer
  14. Physics

    A small sphere of mass 2 kg is attached to the end of a cord of length 2m and rotated in a vertical circle about a fixed point O. Determine the tension in the cord at the lowest point of the trajectory if the speed at this point is 7m/s. Use g=9.8 m/s2.

    asked by Anonymous
  15. Physics

    A small sphere of mass 3 kg is attached to the end of a cord of length 2m and rotated in a vertical circle about a fixed point O. Determine the tension in the cord at the uppermost point of the trajectory if the speed at this point is 8m/s. Use g=9.8 m/s2.

    asked by Anonymous
  16. Calculus (math)

    A boat leaves a dock at 2:00 P.M. and travels due south at a speed of 15 km/h. Another boat has been heading due east at 20 km/h and reaches the same dock at 3:00 P.M. How many minutes past 2:00 P.M. were the boats closest together?

    asked by Olivia
  17. Calculus (math)

    A painting in an art gallery has height h and is hung so its lower edge is a distance d above the eye of an observer. How far from the wall should the observer stand to get the best view? (In other words, where should the observer stand so as to maximize

    asked by Thanks to whoever solve this!
  18. Physics

    A small sphere of mass 1 kg is attached to the end of a cord of length 1 m and rotated in a vertical circle about a fixed point O. If the speed at the uppermost point of the trajectory is 1 m/s, the sphere will have a circular trajectory (will move in a

    asked by Anonymous
  19. calculus

    The Voltage v , Current I and Resistance R are related by the equation V=IR. Suppose that V is increasing at a rate of 2 volt/sec, while I is decreasing of the rate of 1/5 (amp/sec ). Let t denote time in seconds. Find the rate at which R is changing when

    asked by maria
  20. Calculus

    Joshua jumps from a platform diving board that is 32 feet above the water. The position of the diver can be modeled by s(t) = -16t2+16t+32, where s is his position and t is the seconds that have gone by since he jumped. When does the diver hit the water,

    asked by Connor
  21. Math Question

    In △PQR, ∠R=90◦ ,∠P=58◦, and PR=7.1 cm. Determine the area of △PQR to the nearest tenth of a square centimetre.

    asked by Anonymous
  22. Intermediate Algebra

    A bank loaned out $17,000 part of it at a rate of 6%per year and the rest at 14%per year. If the interest received in one year totaled $1500 how much was loaned at 6%.

    asked by Babydoll2007
  23. physics

    . A 2.0 kg brick has the dimensions 7.5 cm x 15 cm x 30 cm. Find the pressure exerted by the brick on a table when it is resting on its various faces.

    asked by jill
  24. Math

    In trapezoid CDEF, angle D = angle E=90degrees. Angle C =60 degrees, EF=4.5cm, and DE=3.5cm. What is the perimeter of the trapezoid to the nearest mm?

    asked by Anonymous
  25. Accounting

    On Jan.1, Pedigo Corporation purchased a small company and recorded goodwill of $150,000. its useful life is indefinite. may 1- purchased for 475,000 a patent with an estimated useful life of 5 years and a legal life of 20 years.Prepare adjusting entries

    asked by Etta
  26. Mechanical Behavior of Materials

    The television coverage of the World Series showed several remarkable slow-motion views of the deflection of the bat as it hit the ball. Major league wood baseball bats are made of ash. A typical major league bat has a length of 0.95m and a tapering

    asked by zxcv
  27. socials studies 9

    why do you think lawyers in the land claims trials refer to the royal proclamation of 1763 more than 200 years after it was proclaimed? I do not understand this question..

    asked by Maddie
  28. physics

    A jet plane is flying with a constant speed along a straight line, at an angle of 25.5° above the horizontal, as Figure 4.30a indicates. The plane has weight vector W whose magnitude is 86500 N, and its engines provide a forward thrust vector T of 103000

    asked by pooh
  29. Art History

    The top rock on a dolmen is called the: A. bridge B. Henge C. Capstone D. Cairn I think it's C., but not sure

    asked by Pat
  30. Mechanical Behavior of Materials

    The creep compliance of a polymer is given below. A specimen of polystyrene is loaded in creep with a stress of 10MPa for 25hours and 30MPa for an additional 25hours and then unloaded. What is the creep strain after 75hours? t (hours) J(t) MPa-1 0 1.0 x

    asked by zxcv
  31. Mechanical Behavior of Materials

    An atomic force microscope cantilever, of rectangular cross section, has a length, l, of 200μm, a width, b, of 20μm and a depth, h, of 1μm. It is made of silicon nitride, which has a Young's modulus, E, of 300GPa. What is the maximum force that can be

    asked by zxcv
  32. Chemistry

    What would be the molarity of a solution made by dissolving 126g K3PO4 into 1500 mL of water?

    asked by Teresa
  33. Calculus

    A marble is dropped from the top of the empire state building. a. Determine the position and velocity functions for the marble b. What is the average velocity for the first 3 seconds of flight? c. Whatisthespeedofthemarblewhent=0? t=3? t=6? d. How long

    asked by Connor
  34. Mechanical Behavior of Materials

    A helmet has an open cell polystyrene foam liner that is designed to absorb the kinetic energy from an impact. The foam has a relative density of 10% and the Young's modulus of the solid polystyrene that the foam is made from is 1.5GPa. How much energy per

    asked by zxcv
  35. Mechanical Behavior of Materials

    Calculate the load that a fibroblast cell applies to buckle a single column in a collagen tissue engineering scaffold, given that the column has a length of 100μm, is circular in cross section, with a diameter of 2μm, and has a Young's modulus of 5MPa.

    asked by zxcv
  36. Mechanical Behavior of Materials

    At a point in a plate subjected to plane stress loading along its surface, the cartesian stress components acting on the y-face of an element oriented along the (x,y) frame are σy=8MPa and τxy=16MPa, The maximum allowable tensile (normal) stress, to

    asked by zxcv
  37. algebra

    Please Help Me Check My Work :) 1) Find the 5th term of - f(n)= 3(n-3) My answer- -279 2) Find the third term if the first term is 4 - f(n)= 2f(n-1)+2 My answer- 16 3) Find the third term using the explicit rule - f(n) 4-n/n+3 My answer- 1/6 4) Recursive

    asked by Kim
  38. Science: Chemistry

    1. The element gold, Au, has a face-centered cubic structure. (Density - 19.3 g/cm^3) (a) What are the # of gold atoms in 1 unit cell? (b) What are the # of unit cells in 1 mol? (c) What is the volume of 1 mol gold unit cells? (d) What is the volume of 1

    asked by Supriya
  39. Physics

    A 1550 -kg car moves on a horizontal curved road. If the radius of the curve is 46 m and the coefficient of friction between the tires and road is 0.1, find the maximum speed the car can have so that it may not skid.

    asked by Anonymous
  40. Physics

    A 4.80kg cat leaps from the floor to the top of a 94.0-cm-high table. If the cat pushes against the floor for 0.230s to accomplish this feat, what was her average power output in hp during the pushoff period?

    asked by Dib
  41. Chemistry

    What is the density (in mg/mL) of a H2S gas at 12.9 atm and 137 K?

    asked by Sydney
  42. Art History

    One fundamental change that marks the beginning of the Neolithic period is: A. year-found settlements. B. use of the bow and arrow. C. weaving D. use of stone tools I think it's A, but not sure.

    asked by Pat
  43. Statistics

    About 7% of men in the U.S. have some form of red-green color-blindness. Suppose we randomly select one U.S. adult male at a time until we find one who is red-green color-blind. How many men would we expect to choose, on average? Design and carry out a

    asked by AnaGloria1020
  44. Trigonometry

    A telephone pole 40 feet high is situated on an 13° (H) slope from the horizontal. The measure of angle CAB is 21°. Find the length of the guy wire AC.

    asked by Karen
  45. chemistry

    3. If 5.20 g of HCl is added to enough distilled water to form 3.00 L of solution, what is the molarity of the solution? [Use molecular weight: HCl, 36.46 amu] 5.20/36.46= 0.1426 X 3.00=0.428 M IS THIS CORRECT

    asked by Anonymous
  46. Chemistry

    I'm having trouble understanding Boyle's Law and Dalton's law of partial pressures. Can anyone help me work this please? Thank you A sample of propane gas, C3H8, was collected over water at 22.5 ºC and 680. torr. The volume of the wet gas is 3.89 L. What

    asked by Katie
  47. math

    Concrete is made by mixing cement and sand in the ratio 3:1:15 how much sand would be needed to make 125 tonnes of concrete

    asked by julian
  48. math

    An urn initially contains 5 white and 7 black balls. Each time a ball is selected, it’s color is noted and it is replaced in the urn along with two other balls of the same color. Compute the probability that (a) one black and one white is selected. (b)

    asked by rajesh
  49. Trigonometry

    Round your answer to three significant digits. Use the distances shown in the following figure to determine the depth of the submarine below the surface of the water. Assume that the line segment between the surface ships is directly above the submarine.

    asked by Karen
  50. Chemistry

    1. The eleent gold, Au, has a face-centered cubic structure. (Density - 19.3 g/cm^3) (a) What are the # of gold atoms in 1 unit cell? (b) What are the # of unit cells in 1 mol? (c) What is the volume of 1 mol gold unit cells? (d) What is the volume of 1

    asked by Supriya
  51. Physics, please!

    Bill kicks a rock off the top of his apartment building. It strikes a window across the street 17 m away. The acceleration of gravity is 9.8 m/s2 . If the window is 22 m below the position where Bill contacted the rock, how long was it in the air? Answer

    asked by arielle
  52. Math

    Use inverse trigonometric functions to find a solution to the equation in the given interval. Then find solutions? cos x = -0.6 , 0

    asked by George
  53. Intermediate Algebra

    How much would you have to deposit today in order to have $5000 in 4 years in a bank account that pays 5% annual interest rate

    asked by Babydoll2007
  54. statistics

    For a certain yes/no survey question, 55% of the respondents answered “yes”.     The null hypothesis is that the population is equally divided on this issue (50% yes and 50% no). The sample size is equal to your age.      For a significance

    asked by melissa
  55. calculus

    Use l'hopital's Rule to evaluate lim x in 0 of (4x(cos 6x-1 )) / sin 3x-3x

    asked by Julia
  56. chemistry

    Is it appropriate to call a soft drink an aqueous solution? Justify your answer.

    asked by asok
  57. Enlgish

    I just need an explanation from the instructions. I am a bit confused about it. EITHER use EACH of these nouns in a sentence which shows a human trait or characteristic OR choose one noun and use it in FIVE different sentences showing five human traits for

    asked by Nora
  58. Chemistry

    How many hydrogen bonds can each (i) water and (ii) ice molecule form?

    asked by John
  59. Finance

    Here's another way to look at it. Suppose you want to borrow $100,000. You choose a 30-year fixed rate loan at 7.5%, and pay one discount point ($1,000), a 1% origination fee ($1,000), and $350 in other fees. Although the lender is giving you a loan for

    asked by Rosey
  60. Chemistry

    What is the molarity of a solution made by mixing 213.6 ml of 1.5 M NaCl with 328 ml of 4.3 M NaCl?

    asked by Jeremy
  61. Grammar

    Think critically or critically think

    asked by Anonymous
  62. Social Studies

    information to show how the U.S. Constitution distributes and limits powers within the federal government.

    asked by Anonymous
  63. Algebra 2

    Solving By Factoring (x-8)(x-5)=x Please show work!!!!

    asked by Alicia
  64. Trigonometry

    An airplane approaches an airport. At a certain time, it is 939 m high. Its angle of elevation measured from the airport is 19.5◦. To the nearest metre, how far is the plane from the airport?

    asked by Anonymous
  65. Chemistry

    What is the molar mass of a gas (96.0 g) in a 25.0 L container at 27.0 °C? The pressure inside the container is 3.04E5 Pa.

    asked by Amanda
  66. Intermediate Algebra

    The average monthly benefit B for certain individuals is given by the equation B=18.75+585.72, where t is the number of years since 1990. In what year will the monthly benefit B exceed $1050? That is, solve B>1050.

    asked by Babydoll2007
  67. Physics

    A ball is thrown horizontally from the top of a building 30.1 m high. The ball strikes the ground at a point 66.8 m from the base of the building. The acceleration of gravity is 9.8 m/s2 . Find the time the ball is in motion. Answer in units of s

    asked by None
  68. English

    He is proud that he is rich. ----------------- What is the part of speech of 'that he is rich'? Is it an adverbial clasue? Or is 'of' omitted before 'that'?

    asked by rfvv
  69. Physics with Calculus

    The system shown in the figure is in static equilibrium. The rod of length L and mass M is held in an unpright position. The top of the rod is tied to a fixed vertical surface by a string, and a force F is applied at the midpoint of the rod. The

    asked by Rico
  70. KCKCC

    A researcher believes that the percentage of people who exercise in California is greater than the national exercise rate. The national rate is 20%. The researcher gathers a random sample of 120 individuals who live in California and finds that the number

    asked by Tina
  71. Physics

    A 24.00 kg block at rest on a horizontal frictionless air track is connected to the wall via a spring. The equilibrium position of the mass is defined to be at x=0. Somebody pushes the mass to the position x=0.3500 m, then lets it go. The mass undergoes

    asked by Liz
  72. Trigonometry

    Round answer to two significant digits A telephone pole 40 feet high is situated on an 13° (H) slope from the horizontal. The measure of angle CAB is 21°. Find the length of the guy wire AC.

    asked by Karen
  73. MicroEconomics

    an accountant claims that she has found a legal way for Beth to shelter $3,000 of taxable income from the federal government. The maximum amount that Beth is willing to pay to learn this strategy and reduce her taxable income by $3,000 is

    asked by Anonymous
  74. Algebra 2

    Solving By Factoring Help me with these problems. 2x(2x+1)=2 5x^2+34x=7 Please show work I want to learn!!!

    asked by Migue
  75. mathematics

    find the number in an A.P such that the sum of 1st and 3rd term is 12 and the product of 1st and 2nd is 24

    asked by mikkymiczy
  76. calculus

    This is a question related to L'hopital's rule. lim x -> -infinity of ((x)(e^x)) This thing is weird because I apply l'hopital's rule yet I never receive the correct answer which is supposedly = 0. It just stays in the form [-infinity * -infinity]. Anyone

    asked by Joshua
  77. Algebra 2

    Solving By Factoring 7p^2-50p=-7 Please show work for I could learn.

    asked by Miguelina
  78. S.S.

    7. After 1965, black civil rights leaders found it difficult to A. now support Hispanic rights in the United States. B. protest the Vietnam War. C. enforce the new laws in the South. D. achieve economic equality in the North. It's not B.

    asked by Sarah
  79. physics

    I'm working on my science fair project for 5th grade. I want to measure the speed of rotation from an Ice skater. What type of equipment would I need to use? I think a video camera, a bright dot on the skater's chest and some type counter software. That's

    asked by Maria D
  80. trig

    if x is a positive acute angle, then express tan(180+x) as a function of x

    asked by eeep
  81. math

    which would be better for determining the sample space, a tree diagram or an area model? Justify your answer

    asked by susanna
  82. Calculus

    This is a question related to L'hopital's rule. lim x -> -infinity of ((x)(e^x)) This thing is weird because I apply l'hopital's rule yet I never receive the correct answer which is supposedly = 0. It just stays in the form [-infinity * -infinity]. Anyone

    asked by Joshua
  83. calculus

    find the derivative of y y= 2 (22x+31)^(3/2)+ arctan((22x+21)^(1/2))+ln(11x+16)-22x-30

    asked by John
  84. math

    If a certain number is added to the numerator and denominator of 1113 , the result is 1011 . Find the number

    asked by Janis
  85. history

    2. Roosevelt addressed the struggles of industry with the National Industrial Recovery Act (NIRA). Which of the following was not one of the main components of this effort? African American labor assistance Public works projects National Recovery

    asked by Anonymous
  86. Preschool Creative Thinking

    A creative teacher should encourage and accept non-conformist behavior as long as it: a. constructive b. joyful c. age-appropriate d. inoffensive I thinking c, but the word encourage mad me think it might be a, because one should always encourage

    asked by anonymos
  87. arithmetic

    the 20th sum of an arithmetic progression is -7 and the sum of the first 20 terms is 620. find the 1st and 30th terms i am looking at using S20 = a(1-rn)/l-r = 620. but i am reallys tuck and think i am very wrong. please help.

    asked by livvy
  88. Economic

    Beth is single and lives in New York. Beth earned $280,000 in 2011. The following table shows the IRS tax rates for a single taxpayer in 2011 On Taxable Income .. Tax Rates up to $8,500 10% From $8,500 to $34,500 15% From $34,500 to $83,600 25% From

    asked by Anonymous
  89. Algebra 2

    Find x,y,z 2x-3y+z=-1 2x-y+2z=6 5x-4y+3z=6 Please show work I want to learn!!!

    asked by Anonymous
  90. chemistry

    (3.0 x 10^4 ) ÷ (6.2 x 10^1) = 18.6x10^3 (4.7 x 10^-3 ) ÷ (9 x 10^-4) = 42.3x10^-7 (3.0 x 10^4 ) x (6.2 x 10^1) = 18.6x10^3 (5.1 x 10^2 ) x (3 x 10^4) = 15.3x10^-2

    asked by anonymous
  91. Mustapha

    The oxidation number of kromium in k2Cr2O7

    asked by Ahmad
  92. math

    3x-2 + 2-x = - 1 ---- ---- -- 8 4 2

    asked by edu
  93. Algebra 2

    Solving By Factoring 6x^2-13x=-6 (x-8)(x-5)=x 4x(x-6)-x(x-2)=-24 Please show work I want to learn!!!!!!

    asked by Clara
  94. math

    What is 1 plus 1

    asked by Jenny
  95. Chemistry

    what are the simplest molecules to synthesize a n,n-dimethyl-2-methylpropanamine

    asked by P
  96. Algebra 2

    Solving By Factoring 4x(x-6)-x(x-2)=-24 Please show work!!!

    asked by Clara
  97. maths

    the denominator of a fraction is two more than the numerator.when we decrease the numerator by1 and increase the denominator by 3,we get 1/4.find the fraction

    asked by anuj
  98. Calculus

    what is x and cosh ln(x) when tanh(lnx^(1/2)= 12/13

    asked by Jenni
  99. science

    what is in your ear?

    asked by liela
  100. human life

    how does the human life cycle in a body

    asked by liela
  101. physics

    A 2.7 kg object falls from a tower. It experiences 2.3 N of air resistance. What is the acceleration?

    asked by anon
  102. Maths

    The pulley in the jib of a crane has a diameter of 56cm. Find: a) The circumference of the pulley b) The number of revolutions turned by the pulley when the crane raises a load through a vertical height of 44m.

    asked by Hyaa
  103. math

    2 six sided dice are throne together.what is the probability that a total of 10 is thrown.can u show me how to do please ,thanks

    asked by julian
  104. E.V.S

    Project on there is great relationship between elnino and droughts of India.

    asked by Sneha
  105. math

    Let r be a rational number. Is (ab)^r = a^r b^r for any real numbers a and b?

    asked by JUN
  106. math

    the bearing of P from Q is 60. what is the bearing of Q from P?

    asked by Anonymous
  107. algebra

    solve the equation for x -2(2x-2)=2x for y 9x+y=9 solve theinequality 2x-6

    asked by gary
  108. economics

    6)Assume the graph below represents the market demand for a patented prescription drug together with the firm-level marginal cost and average cost functions for producing the drug. Assume these cost curves do not reflect R&D costs of developing this drug,

    asked by Anonymous
  109. math

    A round, 6-ft wide hot tube is being built into a 12-ft by 30-ft rectangular deck. How much decking is needed for the surface of the deck?

    asked by Michael