1. Maths / Physics (uni level)

    Say I have a centre of rotation at C(x, y, 1

    asked by Lianne on May 24, 2017
  2. statistic

    Let x be a random variable that represents the length of time it takes a student to complete a take-home exam in Dr. Larson’s psychology class. After interviewing many students, it was found that x has an approximately normal distribution with mean =5.2

    asked by Anonymous on November 6, 2013
  3. Physics

    Continue...previous question b)what normal force would the car experience on the top of a circular hill of radius 20.0m when it reaches the near horizontal section of the vertical curve with a speed of 12.0 m/s ? Draw app. free body diagram.

    asked by johnny on October 29, 2007
  4. Science

    When energy changes forms, the total amount of energy is conserved. However, the amount of useful energy is almost always less than the total amount of energy. Explain the energy conversions and unwanted energy that might be produced by the hinges of a

    asked by Elijah on January 5, 2011
  5. Urgent--Geometry(trig part)

    So I am new to sine, cosine, and tangent, so I need some help. Just explain it. No need for the answers unless you want to give it to me. :D Let triangle ABC be a right triangle with angleC=90degrees. Given the tangent of one of the complementary angles of

    asked by Anonymous on March 2, 2017
  6. vapor pressure

    The total pressure in a flask containing air and ethanol at 25.7C is 878 mm Hg. The pressure of the air in the flask at 25.7C is 762 mm Hg. If the flask is immersed in a water bath at 450C, the total pressure is 980 mm Hg. The vapor pressure of ethanol at

    asked by yayhawknelson on January 19, 2007
  7. physics

    Suppose the smallest division on the scale of the timing device is t, the reaction time of a normal person os t', which one should be used for estimating the incertainty on the measurement of period T after a single timing activity? Explain briefly.

    asked by gay on May 11, 2010
  8. Middle childhood Psychology

    Is it important to start children in school according to the normal ages where they go through different mental stages? I notice that the same information is presented to children throughout the educational system but at different times so that the child

    asked by Sharon on July 31, 2011
  9. state

    A machine put the juice in the bottle with normal distribution with mean is equal to 50 cl, with the standard deviation 5 cl. Test was done to see if the claim is right. A sample of 100 bottles were tested. They got the average content of 48.9 cl. At ∝

    asked by iram on December 11, 2015
  10. Physics

    Consider a spider walking from the top of a (stationary) beach ball. (Let that angular position = 0 O .) The spider finds it loses its grip when the normal force between it and the surface is less than 1/2 of its weight. At what angle does this slipping

    asked by Zac on July 26, 2012
  11. help! physics

    Two masses (m1 = 532 grams, m2 = 114 grams) are connected with a rope through a frictionless pulley The ramp has an elevation angle θ = 65.3° and a coefficient of friction μ = 0.184. What are Fll and Fperpendicular for m1? What is the normal force on

    asked by Haley on December 1, 2010
  12. Biology

    Find an angiosperm that has modified leaves, stems, roots or flowers that do not function in a normal manner? Example: Claifornia Barrel Cactus has spines in place of leaves to reduce water loss.

    asked by Michelle on July 8, 2008
  13. Chemistry

    Benzene has a heat of vaporization of 30.72 kj/mol and a normal boiling point of 80.1 degrees celsius. At what temperature does benzene boil when the external pressure is 480 torr? Can someone show me an equation and how to solve this?

    asked by Anonymous on July 19, 2011
  14. Stat

    Thirty randomly selected students took the calculus final. If the sample mean was 89 and the standard deviation was 6.2, construct a 99% confidence interval of the mean score of all students. Assume that the population has a normal distribution. what

    asked by Billy on September 30, 2014
  15. Physics

    A 50-kiligram block initially at rest on a flat, level and smooth surface is pulled by 6.0 Newton acting 37 degrees North above the horizontal. Find the normal force and acceleration of the block.

    asked by Jay on February 24, 2016
  16. Physics

    To save fuel, some truck drivers try to maintain a constant speed when possible. A truck traveling at 110.0 km/hr approaches a car stopped at the red light. When the truck is 211.7 meters from the car the light turns green and the car immediately begins to

    asked by Yarielis on March 2, 2014
  17. math/economics in calculus

    The average cost of manufacturing a quantity q of a good, is defined to be a(q) = C(q)/q. The average cost per item to produce q items is given by a(q) = 0.01q2 − 0.6q + 13, for q >0. I know that the total cost is 0.01q^3-0.6q^2+13q What is the minimum

    asked by Jasmine on November 5, 2015
  18. engineering science

    Given the circuit below with unknown voltage source and a voltage drop of 2.233 v Volts on resistor R3, with (R1 = 2KΩ, R2 = 1KΩ, R3 = 3.3KΩ, R4 = 4.7KΩ, R5 = 4.7KΩ). Calculate and complete the table below.

    asked by dan on October 15, 2018
  19. Math

    Ineed to come up with an EXCEL formula for the following; Ineed to determine the total number of games. I know the % (games) of lost and I know the number of (game) wins. I need to determine the total number of games. I can figure the % of wins by

    asked by Michelle on February 2, 2011
  20. pre algebra check

    The measures of two angles of a triangle are given. Tell whether the triangle is acute, right, or obtuse. 19°,35° I think its obtuse

    asked by amy on May 30, 2012
  21. Geometry

    The sides of one triangle are twice as long as the corresponding sides of a second triangle. What is the relationship between the angles?

    asked by Susey on March 26, 2017
  22. math

    A triangle having three equal sides is necessary and sufficient for a triangle having three equal angles

    asked by Anonymous on September 6, 2014
  23. math

    if an angle of parallelogram is two third of its adjacent angle,find the angles of the parallelogram

    asked by zeeshan on August 11, 2016
  24. Geometry

    True or False? In an obtuse triangle all the angles are obtuse. I think it's false but I'm not sure.

    asked by Andrea on May 5, 2015
  25. math

    The sum of 2 angles is 90. The measure of one angle is 1 1/2 times the measure of each angle

    asked by lisa on August 27, 2012
  26. Geometry

    This is Parallel lines and angles. The measure of angle (3x+17)? the measure of angle (4x+12)?

    asked by Holly on October 14, 2007
  27. math

    Angles X and Y are congruent. Angle X has a degree measure of 15. What is the measure of angle Y?

    asked by angel on September 2, 2011
  28. TRIG

    Half angles in trig (square root(1-square root(21)/5)/2)

    asked by Renee ( PLEASE HELP ME) on April 23, 2014
  29. math

    if angle pqr=1 1/2 right angles find the reflex angle pqr

    asked by tia on January 11, 2017
  30. 7th grade math

    Can you check the following? 10. A store pays $10 for a bracelet, and the markup is 115%. A customer will also pay 5 1/2% sales tax. What will be the total cost of the bracelet to nearest cent? t = 1.15 x 10 t = $11.5 (markup price) t = $10 + 11.5 t =

    asked by Alexis on January 17, 2015
  31. statistics

    Q. The MBA department is concerned that dual degree students may be receiving lower grades than the regular MBA students. Two independent random samples have been selected. 100 observations from population 1 (dual degree students) and 100 from population 2

    asked by jeen on November 29, 2010
  32. Physics

    A special pulley has two discs with radii R1 = .8 m and R2 = .35 m. A rope from the R2 disc connects the pulley to a wall and a rope from the R1 disc connects the pulley to a hanging mass. The axle is frictionless. The total mass of the pulley is 15 kg. a.

    asked by Charlie on April 23, 2012
  33. Math

    The measure of (Angle) A is 4 degrees greater than the measure of (Angle) B. The two angles are complementary. Find the measure of each angle. (I tried 41+45 but that didn't work out, anyone got any steps to solve this?)

    asked by Katelyn on November 13, 2017
  34. Math/Writing-HELP PLEASE

    Explain why a trapezoid a quadrilateral, but why all trapezoids are not always quadrilaterals. If a shape has four sides, no equal angles or sides, what is it? This is an opinion fill in the blank, but I can't think of any words. You give me love, You gave

    asked by Kaylee on March 8, 2011
  35. Math - Trigonometry

    Standing on top of a building 42 m high, an observer sights two objects at P and Q on opposite sides of the building. The angles of depression from the observer to P and Q are 23° 18' and 35° 33' respectively. What is the distance between P and Q to the

    asked by Anonymous on March 17, 2017
  36. p6

    A 5.40 cm diameter wire coil is initially oriented so that its plane is perpendicular to a magnetic field of 0.510 T pointing up. During the course of 0.130 s, the field is changed to one of 0.300 T pointing down. What is the average induced emf in the

    asked by dude on October 9, 2010
  37. Math

    1.)Suppose you interview 10 randomly selected workers and ask how many miles they commute to work. You'll compute the sample mean commute distance. Now imagine repeating the survey many, many times, each time recording a different sample mean commute

    asked by Elie on March 16, 2011
  38. Coterminal Angles

    I need help with this.. it's for my midterm review. My midterm is next week. I would appreciate the help. Determine two coterminal angles (one positive and one negative) for each angle. The answer must be in degrees. a) 36 degrees b) -120 degrees c) 300

    asked by Joe on January 6, 2008
  39. HELP i dont get it

    The producer of X is contemplating a price change and has asked for your advice. After some empirical investigation, you conclude that the price elasticity of demand for X is 0.75. Your advice to the producer is to Increase price to raise total revenue.

    asked by john on November 1, 2010
  40. the percent equation

    1. find 30% 0f 70 2 what is 80% of 65 3 what percent of 56 is 14 4 36 is what percent of 40 5 80 is 40% of what number? 6 65% of what number is 78 7 what percent of 2000 is 6 8 12 is what percent of 4000 9 what percent of 3000 is 18 10 what is 110% of 80

    asked by Fabian on January 28, 2009
  41. Algebra

    Keiko is a software saleswoman. Let represent her total pay (in dollars). Let represent the number of copies of History is Fun she sells. Suppose that and are related by the equation . Answer the questions below. Note that a change can be an increase or a

    asked by James on March 28, 2014
  42. Check answers?

    Your elbow and knee are examples of ligaments. joints.**** cartilage. angles. The muscular system allows our bones to strengthen. contract. lengthen. move.**** This muscle helps to transport blood to and from the heart. smooth muscle cardiac muscle****

    asked by MsHemmoPenguin on March 11, 2016
  43. Choctaw Middle School

    Admission to a circus is $16 for adults and $10 for children write an expression to find the total cost of 3 adult tickets and four children's tickets then find the total cost

    asked by Kylie on September 1, 2015
  44. geometry

    The total surface area of a rectangular solid is the sum of the areas of the six faces. If each dimension of a given rectangular solid is doubled, what effect does this have on the total surface area?

    asked by Jen on October 1, 2018
  45. geometry

    I found the volume of six cubes to total 336 cubic inches. How do I change the volume to surface area? I need to find the Find the total Surface Area

    asked by JOY on May 25, 2011
  46. algebra

    In any triange, the sum of the measures of the angles is 180degrees. In triangle ABC, angle A is four times as large as angle B. Angle C measures 20degrees less than angle B. Find the measure of each angle.

    asked by misha on October 20, 2008
  47. math

    A hardware supplier manufactures three kinds of fasteners, type A,B and C. Production restrictions require it to make 10 units more of type C than the total of the other types and twice as many type B as type A. The shop must produce a total of 490 units

    asked by Anonymous on November 1, 2012
  48. chemistry

    so we did a chemistry lab to find the relationship between temperature and volume or charle's law. In the experiment, i got t1v1=372K, 267.2 cm^3 t2v2=277K,169.1 cm^3 so i graphed that THen they told us to chose 2 other points from that line, TaVa and TbVb

    asked by X on May 5, 2011
  49. please check my grammar

    AN.15,2016 From: Genecito Jimenez Dear sir/madam, The JIMENEZ INTERNET CAFE has been operating the business started last Oct.15,2015. There are 14 computers for the clients and 1 computer for server with the total of 15 pc's. The total amount of expenses

    asked by jessie on January 15, 2016
  50. physics

    a car traveling at 30.0m/s undergoes a constant negative accerleration of magnitude of 2.00m/s^2 when the brakes are applied. how many revolutions does each tire make before the car comes to a complete stop,assuming thaat the car does not skid and that the

    asked by nay on February 24, 2009
  51. Math

    Select any concept from this week.(Linear equations,exponents, Logarithmic problems Write a 350- to 700-word response in which you examine the importance and applicability of this concept. Describe why this concept is important and how it can be applied to

    asked by Tiara on March 30, 2012
  52. physics

    An air-filled capacitor consists of two parallel plates, each with an area of 7.60 cm2, separated by a distance of 1.70 mm. If a 19.2-V potential difference is applied to these plates, calculate the following: (a) the electric field between the plates,

    asked by andrew on May 18, 2012
  53. Math accelerated

    A decorative floor pattern has 1red square tile surrounded by 12 blue tiles.write and evaluate an expression to show how many total red and blue tiles are needed if there are 15 red tiles. Then make a table showing the total number of tiles if there are

    asked by Jeontae on August 24, 2015
  54. Physics

    I'm having trouble where to start with this question.. Any help would be helpful. A projectile is fired with an initial speed of 75.2 m/s at an angle of 34.5° above the horizontal on a long flat firing range. Determine (a) the maximum height reached by

    asked by LINA on January 19, 2016
  55. math

    Total hours: 42 (including 4 hrs sick leave, 6 hrs travel) Week 2 — Total hours: 46 (including 5 hrs travel)What percentage of the recorded time did the worker spend traveling?

    asked by nita on July 18, 2012
  56. algerbra 1

    Antartica comprises about 10.5% of the total land area on earth. antartica has a surface area of about 5,400,000 square miles. what is the total land area on earth? write an equation and slove.

    asked by miranda on September 27, 2010
  57. math

    At a street fair, a vendor keeps her stall open 6 hours per day. She also spends a total of 4 hours over the course of the fair setting up. Let d represent the number of days of the fair and h represent the total hours spent at the fair.

    asked by spencer on September 28, 2016
  58. accounting

    Item: Raw Materials (cost for hamburgers) Total Annual Cost: 650 Item: Building Rent Total Annual Cost: 9000 Identify which cost item above is fixed and variable and why

    asked by vdan on November 17, 2007
  59. Physics

    A stone is dropped at t = 0. A second stone, with 4 times the mass of the first, is dropped from the same point at t = 110 ms. (a) How far below the release point is the center of mass of the two stones at t = 410 ms? (Neither stone has yet reached the

    asked by Patricia on April 1, 2014
  60. physics

    A light spring having a force constant of 110 N/m is used to pull a 10.0 kg sled on a horizontal frictionless ice rink. The sled has an acceleration of 2.0 m/s^2 (a)By how much does the spring stretch if it pulls on the sled horizontally? (b)By how much

    asked by rich on February 18, 2010
  61. Geometry

    A carpenter is building a staircase using his knowledge of right angles. The steps have a horizontal landing and a vertical rise causing each step to be a right triangle cut out. Depending on the purpose, steps may be adjusted by the angle of elevation

    asked by Dana on October 30, 2014
  62. Physic

    A bar has a constant cross sectional area A. The bar is devided in 2 segments segment 1 (1/3 of the bar) and segment 2 (2/3 of the bar). Segment 1 is made of a material with mass density ρ and Young's modulus E. Segment 2 is made of a different material,

    asked by Eatingapple on May 23, 2013
  63. math

    In a factory of electronic items, the total cost of production, expressed in thousands of dollars, is given by the function C(x)= (x^2-x+2)/x+1 where x belongs to [0;5] and expressed in hundrends of items produced. 1) calculate in dollars the total cost of

    asked by Jessy on January 2, 2011
  64. Physics

    After a day of testing race cars, you decide to take your own 1532.6 kg car onto the test track. While moving down the track at 13.5 m/s, you suddenly accelerate to 32.8 m/s in 11 s. What average net force have you applied to the car during that time?

    asked by Harmonie Sky on October 28, 2013
  65. Physics

    A 4 kg block rests between the floor and a 3 kg block. The 3 kg block is tied to a wall by a horizontal rope. If the coefficient of static friction is 0.800 between each pair of surfaces in contact, what force must be applied horizontally to the 4 kg block

    asked by Joe on December 19, 2012
  66. Physics

    A hollow sphere of radius 25 cm is rotating at 13 rad/ sec about an axis that passes through its center. The mass of the sphere is 3.8 kg. assuming a constant net torque is applied to the sphere, how much work is required to bring the sphere to a stop?

    asked by hayley on July 9, 2012
  67. chemistry

    Calculate the mass of Li formed by electrolysis of molten LiCl by a current of 6.7×104 A flowing for a period of 23 h . Assume the electrolytic cell is 86 % efficient. What is the energy requirement for this electrolysis per mole of Li formed if the

    asked by Derick on September 21, 2017
  68. Physics HELP

    In a downtown office building you notice that each of the four sections of a rotating door has a mass of 90 kg. What is the width of each section of the door if a force of 58 N applied to the outer edge of a section produces an angular acceleration of

    asked by Jeff on November 15, 2017
  69. PHY101

    A body weighing 3500N is pushed up a rough inclined plane by a force of 5000N. The angle of inclination is 30deg. and the force is applied horizontally. If the coefficient of kinetic friction is 0.5, calculate the acceleration of the body.

    asked by Ebieride on May 17, 2016
  70. physics

    a uniform bar of mass is supported by support pivoted at top about which bar can swing like simple pendulum. If force F is applied perpendicular to lower end of the bar.How big F must be in order to held the bar in equilibrium.

    asked by bharat narke on January 16, 2011
  71. Physics

    In a downtown office building you notice each of the four sections of a rotating door has a mass of 85 kg. What is the width of each section of the door if a force of 62 N applied to the outer edge of a section produces an angular acceleration of 0.460

    asked by Destiny on October 19, 2015
  72. library science

    Q.1. Define Collection Development. How the acquisition of Library Material can be economical, rapid, transparent and accurate? Q.2. What are the different modes of collection building? Highlight the library materials on which general and specific

    asked by hammad on December 31, 2011
  73. English,maths,physics,chemistry

    Topic:machine,a block and tackle of 6 pulleys is used to raise a load of 300N steadily through a height of 30m.if the work done against friction is 2000J. calculate:the work done by effort,the efficiency of the system,the applied effort.

    asked by Chigozie on March 19, 2012
  74. Constitutional Law

    According to the readings, which of the following provisions has NOT been formally applied to the states? A. Fifth Amendment right to a grand jury indictment in felony cases B. First Amendment right to peaceably assemble C. Fifth Amendment right against

    asked by Amy on February 13, 2015
  75. Math

    3. A textbook weighs 2.5 pounds. How many kilograms does the textbook weigh? Round your answer to the nearest tenth of a pound. 1kg = 2.2 lb 1.1 kg 1.8 kg 5.5 kg 4.7 kg (my answer) 5. Solve the proportion using cross products 18/20 = k/110 A. 99 B. 122 C.

    asked by Easy Math problem on March 7, 2014
  76. Algebra

    3.To estimate animal populations, biologists count the total number of animals in a small section of a habitat. The total population of animals is directly proportional to the size of the habitat (in acres) polled. a.Write an equation using only one

    asked by NA on March 18, 2009
  77. Algebra

    To estimate animal populations, biologists count the total number of animals in a small section of a habitat. The total population of animals is directly proportional to the size of the habitat (in acres) polled. a. Write an equation using only one

    asked by Micah on January 21, 2008
  78. Algebra

    To estimate animal populations, biologists count the total number of animals in a small section of a habitat. The total population of animals is directly proportional to the size of the habitat (in acres) polled. a.Write an equation using only one variable

    asked by Micah on January 21, 2008
  79. Algebra

    To estimate animal populations, biologists count the total number of animals in a small section of a habitat. The total population of animals is directly proportional to the size of the habitat (in acres) polled. Write an equation using only one variable

    asked by Jack on April 8, 2008
  80. Algebra

    3. To estimate animal populations, biologists count the total number of animals in a small section of a habitat. The total population of animals is directly proportional to the size of the habitat (in acres) polled. a. Write an equation using only one

    asked by Anonymous on March 17, 2009
  81. Math- Algebra

    To estimate animal populations, biologists count the total number of animals in a small section of a habitat. The total population of animals is directly proportional to the size of the habitat (in acres) polled. a.Write an equation using only one variable

    asked by Micah on January 21, 2008
  82. Biomechanics

    A 10 kg block sits motionless on a table in spite of an applied horizontal force of 2 N. What are the magnitudes of the reaction force and friction force acting on the block?

    asked by Jami on April 19, 2013
  83. physics

    A car moving at 62 mi/h can be brought to rest in 4.8 s. Assuming that the deceleration is uniform, how far will the car travel between the time the brakes are applied and the time the car stops?

    asked by Adnane on September 18, 2011
  84. Physics

    A car moving with a speed of 90km per hrt was brought to rest by the applications of brakes in 10sec how far the car the car travel afterwards the brakes were applied

    asked by James awodi on November 7, 2017
  85. Physic

    A1/2 inch diameter piston moves 10 inches when 30 Lbs of force is applied, how far will it move a 6 inch Diamter piston, and how much weight will this piston lift?

    asked by Tonya on October 12, 2014
  86. science

    Two bricks having a 22N force applied on them and each brick having a friction of 1N ,the first brick with the mass of 2kg and the second one having a mass of 3kg.calculate the acceleration that the first brick expiriences

    asked by Bongani on February 29, 2012
  87. physical science

    An input force of 20 newtons is applied to a lever at a distance of 2 meters from the fulcrum. An object 0.5 m away from the fulcrum (and on the other side) is lifted by the 20-N force. What is the output force? A. 10 N B. 20 N C. 40 N D. 80 N

    asked by tetianna on June 16, 2015

    provide a situation when scientific method, case study method, survey method, Naturalistic observation method, Correlation method, and Experimental method could be applied

    asked by scooby on November 21, 2009
  89. Physic

    A 1/2 inch diameter piston moves 10 inches when 30 Lbs of force is applied how far will it move a 6 inch diamter piston and how much weight will this piston lift.

    asked by Ann on October 13, 2014
  90. physics

    a horizontal force of 95 N is applied to 60 kg crate on rough , level surface. if crate accelerates at 1.20 m/s2 , what is magnitude of the force of kinetic friction acting on the crate?

    asked by jerry on March 1, 2010
  91. physics

    A 1000kg rocket is moving forward at 10m/s in space. A 10,000N force is applied to the rocket for one second from behind. How fast is the rocket now traveling? a. 0m/s b. 10m/s c. 15m/s d. 20m/s

    asked by Claudia on November 1, 2011
  92. Math

    Can someone explain to me the rules of distribution. I have a word problem which asks my opinion of applying distribution to each problem but I don't completely understand distribution and when it is applied and when it isn't.

    asked by Anonymous on November 14, 2009
  93. Physics

    A block of mass of 24.0 kg is sitting on a frictionless surface. If the block is initially at rest, and a force of 3.0 N parallel to the surface is applied for 5.0 seconds, what is the final speed of the block?.

    asked by Victoria on December 6, 2011
  94. physics

    A 18.7 ohm and a 24.3 ohm resistor are connected parallel. A difference in potential of 41.5 V is applied to the combination. What is the equivalent resistance of the parallel circuit? Answer in units of ohm .

    asked by maria on March 29, 2011
  95. Pre-Calculus

    Verify the identity. cos x - sec x = -sin x tan x So far I have applied a reciprocal identity =cos x - 1/cos x I know I must combine using the least common denominator but I don't know how it would be written.

    asked by Karry on September 29, 2017
  96. physics

    Your spaceship lands on an unknown planet. To determine the local value of g, you ask a steel-toed crew member to kick a stone, and you find that if she kicks it at 18.0m/s at various angles, the maximum range she can achieve is 30.8m. What is g on this

    asked by lina on September 15, 2009
  97. AP Physics I

    A placekicker is about to kick a field goal. The ball is 26.6 m from the goal post. The ball is kicked with an initial velocity of 19.0 m/s at an angle θ above the ground. Between what two angles, θ1 and θ2, will the ball clear the 2.8-m-high crossbar?

    asked by Matt on September 20, 2015

    A plumber, electrician and painter were all hired to work on 3 different house. For Adam's house, a plumber worked a total of 35 hours, an electrician worked 42 hours and a painter needed 29 hrs to complete the job. the total cost of the three workers for

    asked by Aly on May 25, 2014
  99. statistics

    The lifetime of a 2- volt non-rechargeable battery in constant use has a normal distribution of 516 hours and a standard deviation of 20 hours. What is the z- score for batteries with lifetimes of 520 hours?

    asked by Gee on September 6, 2012
  100. math

    Find the z-score for the given raw score, mean, and standard deviation. Assume a normal probability distribution score = 15, ì = 16 , and ó = 2 Could you show me how to do this. My instructor has tried but I just don't understand how to do it and I have

    asked by sam on August 23, 2009