1. mathematics

    The plane curve is given by the equation R(t)= ( ln sin t)i + ( ln cos t)j. find the unit normal vector to the curve t= ¤Ð/6.

    asked by sibongile on June 27, 2014
  2. physics

    A 15.7 kg block is at rest on a ramp, whose angle is 12.1 degrees from the horizontal. How much Normal Force is acting on the block?

    asked by Anonymous on March 14, 2014
  3. statistics

    Build a 95% confidence interval for the mean of the population from the given sample data. Assume that the population has a normal distribution. 16.4, 15.7, 16.2, 15.8 17.1 15.8, 15.9, 16.0, 16.4 15.0

    asked by Jessica on June 23, 2011
  4. statistics

    Given a normal distribution of scores with a mean of 100 and a SD of 10, compute z scores for the following raw valves: 95, 115, 80, 130.

    asked by Anonymous on November 14, 2011
  5. Physics-Check

    A missile launches at a velocity of 30.0 m/s at an angle of 30.0* to the normal. What is the maximum height the missile attains? (((30)*cos(30))^2)/(2*9.8) )

    asked by LeRoy on April 10, 2009
  6. physics HELP

    Im having problems getting the magnitude of the force in the problem i asked below i got the frictional and normal force please help me put these equations together

    asked by Anthony on November 1, 2012
  7. physics

    Which of the following is correct for the reflected ray if a light ray strikes a plane mirror at an angle of 50° from the normal?

    asked by Tam on January 1, 2016
  8. Physics

    A 22 kg crate is moving horizontally on the floor at a constant speed. Find the normal force on the crate.

    asked by MCPHS on June 13, 2016
  9. statistics

    for a certain psychiatric evaluation z scores above 2.18 and below -2.33 are considered abnormal. what is the probability that a person evaluated by this will be considered normal?

    asked by alex on December 11, 2011
  10. physics

    A 5.7 kg bag of groceries is in equilibrium on an incline of angle θ = 16°. Find the magnitude of the normal force on the bag.

    asked by Anonymous on October 20, 2013
  11. Physics

    Microwaves are electromagnetic waves transmitted at a normal frequency of 2.45 GHz. Find the wavelength of the microwaves.

    asked by Zach on May 30, 2012
  12. physics

    Microwaves are electromagnetic waves transmitted at a normal frequency of 2.45 GHz. Find the wavelength of the microwaves.

    asked by Phil on May 30, 2012
  13. community psycology

    When Bullying Turns Deadly: Can It Be Stopped? Thesis: To me, it was normal because that's what I was used to. This was in an article was wondering if the thesis is good

    asked by Ann on September 10, 2015
  14. psyc

    A normal distribution has µ = 80 and standard deviation = 10. What is the probability of randomly selecting a score greater than 75 from this distribution?

    asked by shauna on March 4, 2013
  15. stat in psyc

    A normal distribution has µ = 80 and standard deviation = 10. What is the probability of randomly selecting a score greater than 90 from this distribution

    asked by shauna on March 4, 2013
  16. math (stats)

    Find the z scores that separate the middle 59% of the distribution from the area in the tails of the standard normal distribution.

    asked by bee on October 13, 2015
  17. Physics

    A ray of light in air has an angle of incidence to the normal of 45° into a piece of glass (1.5). What is the angle of refraction?

    asked by Arnold on March 7, 2013
  18. Physics

    A 4.3 kg bag of groceries is in equilibrium on an incline of angle θ = 30°. Find the magnitude of the normal force on the bag.

    asked by Josh Templin on January 13, 2013
  19. biochemistry

    substrate concentration= 3.5mM (c2) buffer=0.4 ml 10mM PNPP stock= ?ml (V1) water=?ml enzyme= 0.2ml total volume =1ml (V2) I need help with a dilution, I understand that you would be using c1v1=c2v2 but im confused as to what we need to find the amount of

    asked by greg on October 1, 2013
  20. chemistry science

    substrate concentration= 3.5mM (c2) buffer=0.4 ml 10mM PNPP stock= ?ml (V1) water=?ml enzyme= 0.2ml total volume =1ml (V2) I need help with a dilution, I understand that you would be using c1v1=c2v2 but im confused as to what we need to find the amount of

    asked by greg on October 1, 2013
  21. Business

    Robert recently was hired as a technician in the firm. He is being paid $1,250 every two weeks ( after taxes). His monthly bills are: Rent: $900 electricity: $110 car payment: $350 car insurance: $60 fuel for cars: $90 groceries: $180 credit cards: $250

    asked by John on August 30, 2012
  22. Math

    I am a little confused with this trigonometry question. It says that sin0=O. I understand that because It says sin it means quadrant 1 and 2. The possible answers are 0, 90, 180, and 270. I know 270 is not correct but the others are confusing me. Angles 0,

    asked by Ineedhelp on January 22, 2018
  23. math

    an aircraft with an airspeed of 295km/hr is heading south. wind blowing from East at 30km/hr is against the aircraft. 1) sketch the information clearly showing all angles and vectors. 2) calculate the resultant speed and direction of the aircraft

    asked by stormy on November 4, 2015
  24. math

    provide a counterexample to show that each statement is false. a) if a four sided figure has four congruent sides, then it has for right angles. at first i thought of a trapezoid proves that wrong but then i remembered only 2 sides have to be congruent for

    asked by Maryanne on September 1, 2010
  25. trigonometry

    A line AB, 125 feet long, is measured along the sraight bank of a river. A point C is on the opposite bank. Angles ABC and BAC are found to be 65° 40' and 54° 30' respectively. How wide is the river?

    asked by shyiah on October 5, 2015
  26. pre-calc

    two observers 3 miles apart and facing each other find that the angles of the elevation of a balloon in the same vertical plane with themselves are 28degree and 31 degree respectively.find the distance from the balloon to the observer located at the 31

    asked by Haley on November 6, 2012
  27. High School Physics

    The player kicks a football with an initial speed of v0 = 98 ft/s. Determine the two possible values for the angle of the kick, theta. The distance of the football field is 126 ft. Also determine the corresponding time at each of these two angles.

    asked by . on October 25, 2012
  28. Trigonometry

    I'm having trouble figuring this out. An airplane has an airspeed of 160 mph. It is to make a flight in a direction of 80° while there's a 20 mph wind from 310°. What will the airplane's actual heading be? I'd appreciate any help especially on how you

    asked by Shannon on July 27, 2017
  29. High School Physics

    The player kicks a football with an initial speed of v0 = 98 ft/s. Determine the two possible values for the angle of the kick, theta. The distance of the football field is 126 ft. Also determine the corresponding time at each of these two angles.

    asked by Anonymous on October 25, 2012
  30. math

    A disc-shaped spinner has five sections with the following colors and central angles: Blue, 60; Red, 120; Green, 45; Red, 45; and Yellow, 90. Determine the probability for one spin of the spinner. P(B U G)

    asked by Tina on February 10, 2013
  31. precalculus

    Forces with magnitudes of 250 pounds and 130 pounds, act on an object at angles 45°and -61° respectiviley , with the positive axis. Find the direction and magnitude of the resultant of these forces.

    asked by Aaaron on November 27, 2016
  32. Trigonometry

    I'm having trouble figuring this out. An airplane has an airspeed of 160 mph. It is to make a flight in a direction of 80° while there's a 20 mph wind from 310°. What will the airplane's actual heading be? I'd appreciate any help especially on how you

    asked by Shannon on July 27, 2017
  33. High School Physics

    The player kicks a football with an initial speed of v0 = 98 ft/s. Determine the two possible values for the angle of the kick, theta. The distance of the football field is 126 ft. Also determine the corresponding time at each of these two angles.

    asked by . on October 25, 2012
  34. Maths

    The longest side of a triangle measures 267m if two angles are 37 and 48 find the shortest side of the triangle

    asked by Israel on May 11, 2016
  35. Pre-calculus

    What is the general expression in degrees for the measure of all angles coterminal with alpha when alpha=173 degrees?

    asked by Anonymous on May 13, 2013
  36. Algebra

    The interior angles of a regular polygon are all equal. What is the measure of each interior angle of an n-sided polygon? Thank you!

    asked by Cassie on March 10, 2009
  37. geometry

    If a triangle has angle measures 15, 120 and 45, and the length of the side between the 15 and 120 angles is 8, what is the area of the triangle?

    asked by Linda on February 10, 2011
  38. Math

    The m angle is 30 times more than twice angle B. If angle A and angle B form a linear pair find the measurement of both angles.

    asked by N on September 9, 2013
  39. algebra

    One of two complementary angles has a measure of 6º greater than the other. What is the measures of the larger angle? What is the measure of the smaller angle?

    asked by Anonymous on December 19, 2018
  40. math

    A pentagon has a perimeter of 60 inches, a side measures 12 inches. what is the sum of the measures of the interior angles.

    asked by a parent on February 21, 2017
  41. algebra

    The measurement of two angles of a triangle are 44 degrees and 56 degrees. Find the measurement of the third angle. Show your work

    asked by Alexius on December 2, 2012
  42. Math

    Suppose that a given quadrilateral is a kite with no right angles. Which of the following is possible? A) The quadrilateral is a trapezoid. B) The quadrilateral is a rhombus. C) The quadrilateral has congruent diagonals. D) None of the above

    asked by Becca on October 29, 2009
  43. Math

    suppose that a given quadrilateral is a kite with no right angles. which of the following is possible A: the quadrilateral is a rhombus B: the quadrilateral has congruent diagnols C: the quadrilateral is a trapezoid D: None

    asked by Anonymous on January 30, 2010
  44. algebra

    The measurement of two angles of a triangle are 39 degrees and 70 degrees. Find the measurement of the third angle. Show your work

    asked by Alexius on December 2, 2012
  45. Maths urgent

    One regular polygon has twice as many sides as another. If the ratio of the interior angles of the first to that of second is 5:4, find the number of sides in each polygon?

    asked by Rabinprakash Dahal on September 13, 2015
  46. Math

    If the ratio of a base angle and vertical angle of an isosceles triangle is 1:2 find the angles of the triangle

    asked by Niken on March 19, 2016
  47. geomatry

    the measure of one angle of a linear pair is 3 thimes the measure of the other angle. find the measures of the two angles

    asked by jazz on October 18, 2011
  48. Maths

    The vertical angle of an isosceles triangle is twice the sum of the base angles. Find each angle of the triangle??

    asked by Aryan Goel on November 10, 2017
  49. Act Question

    all distances are in feet and all are right angles. a straight line drawn from point w to point z would be how long in feet?

    asked by confused on January 7, 2012
  50. algebra

    The measurement of two angles of a triangle are 69 degrees and 34 degrees. Find the measurement of the third angle. Show your work

    asked by Alexius on December 2, 2012
  51. gr9math

    how many sides does a polygon have if the sum of its interior angles are a) 1080 b) 1260 How could i figure this out without being able to know how many sides the polygon has?

    asked by Rebecca on May 23, 2010
  52. physics

    A car travel a distance of 8 km frome P to Q then moves 6 km at right angles to PQ .Find its travel distance and displacement

    asked by ajay yadav on June 27, 2018
  53. Alegbra 1

    The difference between the measures of two supplementary angles is 8˚. What is the measure of the larger angle? What is the measure of the smaller angle?

    asked by Bill on December 15, 2017
  54. Chemistry

    I need to find heat of vaporization. The liquid starts to vaporize at 110 degrees C and there is 10 g of the liquid. I don't think it matters but it is heated at 60 kj/minute. Would it just be amount multiplied by the temp when it starts to vaporize? I

    asked by jp on February 19, 2010
  55. Calculus Help

    Based on the following table of values for the function w(t), answer the questions below. t= 100 110 120 130 140 150 w(t)= 2.6 7.3 12.7 19 26.1 34.1 a) Which of the following best describes the derivative of w(t)? A. changes sign B. always positive C.

    asked by Nat on July 3, 2014
  56. physics

    A container holds 1.1 g of oxygen at a pressure of 7.40 atm . How much heat is required to increase the temperature by 110 degree C at constant pressure? How much will the temperature increase if this amount of heat energy is transferred to the gas at

    asked by Kidda on April 6, 2010
  57. physics

    A house at the bottom of a hill is fed by a full tank of water 5.0 m deep and connected to the house by a pipe that is 110 m long at an angle of 58° from the horizontal (Fig. 13–48). (a) Determine the water gauge pressure at the house. (b) How high

    asked by emy on November 6, 2013
  58. Algebra

    one side of a triangle is 3 inches shorter than twice the length of the shorest side. the third side is 5 inches longer than the shorest side. if the perimeter is 110 inches, find the lengths of all three sides

    asked by Anonymous on September 1, 2011
  59. math for elementary teachers

    Suppose that carpeting cost $12.36 per square yard at a carpet store. what will be the cost to carpet a conference room if the rooms dimensions are 110 ft by 42 ft. (the conference room should seat 380 people using 6' diameter tables each seating 10

    asked by brittney on March 19, 2012
  60. physics

    How much power is required to do 110 J of work on an object in a time of 0.4 s? W How much power is required if the same work is done in 5 s? W

    asked by james on January 24, 2012
  61. math

    can someone show me how to solve this problem. It determines that in order to sell x smartphones, the price per product must be p=280-0.4x. It also determine that the total cost of producing x smartphones is given by C(x)=5000+0.6x. a. Find the total

    asked by ifi on December 10, 2012
  62. Chemistry

    Did I answer these correctly? 1. What is the total number of principal energy levels or shells in an atom with an atomic number of 30? a. 3 b. 4 c. 5 d. 6 I choose b. 2. The electron configuration of an atom in the ground state is 2-4. The total number of

    asked by timmy123 on October 16, 2010
  63. basic science

    if a force of 140 neaten is applied by a car over a distance of 10 metre within 10 second, calculate. (i) work done by the car. (ii) power of the car.

    asked by victor on April 28, 2012
  64. kashinath palod

    an object of mass 3 kg is at rest. Now a force of vectorS = 6t2^i + 4tj^ is applied on the object then velocity of object at t = 3 sec. is?

    asked by dnyanada on July 7, 2016
  65. physics

    a net horizontal force of 7000N is applied to a car which is at rest.the weight of the car is 90000N. what will be the speed of the car after 10 second?

    asked by sugin on March 31, 2012
  66. Science

    Body of mass 10 kg is at rest on a horizontal surface. A force of magnitude 10 N is applied to the body for 10 s. What is the final speed of the body?

    asked by Moonblood on February 7, 2017
  67. physics

    A capacitor acquires 0.002 coulomb when 50 volts is applied. Its capacitance is a. 0.4 microfarad b. 4.0 microfarads c. 40.0 microfarads d. 400.0 microfarads

    asked by Isaac Pavlov on March 31, 2016
  68. physic

    A rod is 2.40 m long and has a diameter of 2.50 mm. A force of 2000 N is applied to the end to stretch the rod by 1.40 mm. What is the tensile modulus for this rod?

    asked by ngeyoo on April 17, 2016
  69. Physics

    A projectile is fired with a velocity u at right angles to the slope, which is inclined at an angle theta with the horizontal. Derive and expression for the distance R to the point of impact. The only think I know to do in this situation is to make the

    asked by Lynn on October 4, 2009
  70. Trig

    Please help. I can't get this problem at all. When two bubbles cling together in midair their common surface is part of a sphere whose center D lies on the line passing through the centers of the bubble. Also, angles ACB and ACD are 60 degrees. Show that

    asked by HELP on March 6, 2012
  71. geomerty

    Write two conditional statements that make up each bioconditinal. 1. A whole number is multiple of 5 and only if its last digit is ethier a 0 or a 5. 2. Two lines are perpendicular if and only if they intersect to form four right angles. 3. You live in

    asked by Court on April 13, 2010
  72. Algebra

    A rain gutter is made from sheets of aluminum that are 11 inches wide. As shown in the figure the edges are turned up to form right angles. Determine the depth of the gutter that will allow a cross-sectional area of 10 in.². Show that there are two

    asked by Katy on September 12, 2017
  73. 2math

    n January, a company named ACME had 100 employees. In February they lost 15 employees, and in March the company hired 25 new employees. How many employees were working for ACME at the beginning of April? 100 105 110 115

    asked by annie on October 1, 2014
  74. Algebra

    Charlie's wallet contains 3 ones, 2 fives, 2 tens, and 4 twenty dollar bills. ?Charlie randomly grabs a bill from his wallet, replaces it, and grabs another bill. What is the probability that the sum of the two bills is $25? Maybe 6/25 or 6/110. I am

    asked by Blake on May 23, 2016
  75. Chemistry

    Suppose you had a 100.0 gram sample of iron and that 1.00 kJ is applied to the sample . by what amount would the temperature of the sample be raised?

    asked by Dana on December 15, 2010
  76. Physics

    A rubber ball weighs 95 N a. what is the mass of the ball ? b.what is the acceleration of the ball if an upward force of 69N is applied

    asked by Anonymous on November 29, 2009
  77. Physics

    An antique vase sits on a frictionless surface. A 39.3 N force is applied to the vase, and it accelerates at 8.1 m/s2. What is the mass of the vase?

    asked by Jordyn on January 6, 2012
  78. math

    4. Name a pair of corresponding angles. (1 point) 1 and 6 2 and 6 3 and 5 4 and 5 5. if m

    asked by help me asap on January 11, 2016
  79. Physics

    A gamma ray with 700KeV energy is Compton-Scattered from an electron. Find the energy of the photon scattered at 110 degrees, the energy of the scattered electron, and the recoil angle of the electron.

    asked by Paul on September 23, 2014
  80. Physics

    A gamma ray with 700KeV energy is Compton-Scattered from an electron. Find the energy of the photon scattered at 110 degrees, the energy of the scattered electron, and the recoil angle of the electron.

    asked by Sarah on September 24, 2014
  81. Physics

    A gamma ray with 700KeV energy is Compton-Scattered from an electron. Find the energy of the photon scattered at 110 degrees, the energy of the scattered electron, and the recoil angle of the electron.

    asked by Paul on September 24, 2014
  82. Physics

    A gamma ray with 700KeV energy is Compton-Scattered from an electron. Find the energy of the photon scattered at 110 degrees, the energy of the scattered electron, and the recoil angle of the electron.

    asked by Sarah on September 24, 2014
  83. Science

    1. How does a mutation in the DNA affect the way proteins are made? A) a mutation in the DNA results in miss happen tRNA molecules ** B) a mutation in the DNA results in a chance in the mRNA, but it does affect the protein C) a mutation in the DNA affects

    asked by Anonymous on February 4, 2016
  84. physics

    A particle is traveling counterclockwise in a circle of radius r = 2.30 m. At some instant in time, the particle is located by the angular coordinate α = 24.0°, the total acceleration has a magnitude of a = 15.0 m/s2 and is directed at an angle β =

    asked by bob on September 10, 2016
  85. math problem

    You are going to drive 480 miles today at an average speed of 60 miles per hour. Thus you are going to drive for a total of 8 hours. The diameter of the wheels on your car (including tires) is 25 inches. Thus each wheel is going to turn a total of ___

    asked by carol on September 23, 2010
  86. statistics

    The correct size of a nickel is 21.21 millimeters. Based on that, the data can be summarized into the following table: Too Small Too Large Total Low Income 19 21 40 High Income 22 13 35 Total 41 34 75 Q: If 100 children are chosen at random, it would be

    asked by JR on August 19, 2014
  87. Calculus

    Let F(x)= x^2 ∫ sqrt(1+t^3)dt x Find F'(4). I applied the FTC and thought that F'(4) = f(4) which in this case would be sqrt(1+4^3), giving me an answer of sqrt(65), however this is incorrect. I'm not sure how to proceed with the question.

    asked by Tim on November 9, 2016
  88. Physics

    A car is traveling with a kinetic energy if 2200 J. If a braking force of 1100 N is applied to the car, how far will the car travel before it stops?

    asked by Jon on May 23, 2017
  89. physics

    A potential difference of 2.0 V is applied across a wire of cross sectional area 2.5 mm2. The current which passes through the wire is 3.2 × 10-3 A. What is the resistance of the wire?

    asked by Lucy on March 7, 2014
  90. Physics

    A car is traveling with a kinetic energy if 2200 J. If a braking force of 1100 N is applied to the car, how far will the car travel before it stops?

    asked by Jon on May 23, 2017
  91. Physics

    Help a constant force equal to (5i+2j)N moves a particle through a displacement S=(2i+3j). Calculate the workdone by the force. At what angle to the horizontal was the force applied?

    asked by Fiyin on October 12, 2012
  92. Physics(Help!!!!)

    A person of mass m2= 85.0 kg is standing on a rung, one third of the way up a ladder of length d= 3.0 m. The mass of the ladder is m1= 15.0 kg, uniformly distributed. The ladder is initially inclined at an angle θ= 35.0∘ with respect to the

    asked by keitanako on December 9, 2013
  93. Calculus

    A freight company will move one truck load of material according to the following cost schedule: The base shipping fee is $400 for any distance up to and including 150 miles and an additional $50 for each 50 mile increment over 150 miles. The cargo cost is

    asked by George on September 7, 2008
  94. Science

    Can you plz check asp 1. Suppose the total momentum of two masses before a collision is 100 kg m/s. What is the total momentum of the two masses after they collide? (1 point) 0 kg m/s 50 kg m/s 100 kg m/s 200 kg m/s 2. What is the momentum of a 20.0 kg

    asked by Stephanie on May 11, 2015
  95. Chemistry

    Chloroform (CHCL3) has a normal boiling point of 61 'C and an enthalpy of vaporization of 29.24 kJ/mol. What is the value of delta Gvap (in kJ) at 61'C for chloroform?

    asked by Chloe on April 30, 2013
  96. Math

    Exam scores were normal in MIS 200. Jason's exam score was 1.41 standard deviations above the mean. what percentile is he in?

    asked by Nathan on March 26, 2009
  97. math

    Note: y^1 means the deriviative of... If f(2)=3 and y^1(2)=5 find an equation of the tangent line and the normal line to the graph of y=f(x) at the point where x=2.

    asked by joclyn on September 29, 2009
  98. Physics 130

    you push a 15kg cart with a force of 20N, 30 degrees below the horizontal. what is the normal force? Please help test tomorrow.

    asked by Robert on February 26, 2014
  99. calculus

    use the definition of the derivative to calculate f'(x), if f(x)= SQRT(2x) and find the equations of the tangent line and the normal line to the graph of f at x=2

    asked by Raj on November 13, 2010
  100. To ...weirdo

    Please find a normal first name without all the strange (and possibly lewd) symbols. I've deleted a couple of your posts for the questionable symbols on them.

    asked by Writeacher on January 31, 2011