1. Maths

    An aircraft which is maintaining a constant altitude of 1000 metre is travelling directly away from an observer. At a particular instant the angle of elevation is 52 degree and 12 seconds later the angle of elevation is 16 degree. Find the distance

    asked by Shane on April 29, 2013
  2. math

    10/20 + 11/13 I know I have to first find the LCM which is 260. Then I found the equivalent fractions which were 130/260 and 220/260. When I add those I get 350/260 which is an improper fraction. Then I change that to a mixed number fraction. The answer I

    asked by John on January 25, 2016
  3. Physics

    A truck of mass 8,000 kg is traveling along a level road at an initial speed of 25 m/s. The driver then shifts into neutral so that the truck is coasting, and the truck gradually slows to a final speed of 13 m/s. (a) Find the total work done on the truck.

    asked by Chelsea on September 28, 2013
  4. physics

    an air plane takes a circuitous route. the journey is split into 4 sections. d1= 6000km (30.0 n of e) d2= 5600km (NW) d3= 4500km (35.0 S of W) d4= 7000km (12.0 W of S) - Find the resultant displacement of the air plane what do i do, and what is the coreect

    asked by hi on January 14, 2008
  5. physics

    Find the velocity of (a) a cylinder and (b) a ring at the bottom of an inclined plane that is 1.55 m high. The cylinder and ring start from rest and roll down the plane. Hint: Carry out the calculation including the unknown parameters, and they may cancel

    asked by Demis on October 29, 2012
  6. phys

    A mechanic pushes a 2.0 103 kg car from rest to a speed of v, doing 5350 J of work in the process. During this time, the car moves 29.0 m. Neglecting friction between car and road, find each of the following. (a) the speed v m/s (b) the horizontal force

    asked by hpj on October 27, 2010
  7. PHYSICS

    A velocity selector consists of electric and magnetic fields described by the expressions vector E = E k hat bold and vector B = B j hat bold, with B = 0.0140 T. Find the value of E such that a 670 -eV electron moving along the negative x axis is

    asked by ANITA on October 28, 2013
  8. algebra

    You throw a rock off the balcony overlooking your backyard the table shows the height of the rock at different times use quadratic regressin to find a quadratic model for this data. time 0 1 2 3 4 5 height 24 44.2 54.8 55.8 47.2 29 would someone explain

    asked by Lee on October 29, 2012
  9. Physics

    Starting from Newton’s law of universal gravitation, show how to find the speed of the moon in its orbit from the earth-moon distance of 3.9 × 108 m and the earth’s mass. Assume the orbit is a circle. So I calculated this and got 1.0 km/s, I was just

    asked by Marie on December 31, 2014
  10. physics

    A 28.6-g bullet is fired from a rifle. It takes 2.36 × 10-3 s for the bullet to travel the length of the barrel, and it exits the barrel with a speed of 710 m/s. Assuming that the acceleration of the bullet is constant, find the average net force exerted

    asked by michelle on December 5, 2012
  11. statistics, find the probability

    It is known that 77% of all new products introduced in grocery stores fail (are taken off the market) within 2 years. If a grocery store chain introduces 62 new products, find the following probabilities. (Round your answers to four decimal places.) (d)

    asked by troy on October 21, 2011
  12. Economics Homework

    Use the Expenditure Equation for GDP (GDP = C + 1 + G + XN). Using your research skills, find the values for each sector for the years 1929 and 1933. Determine the percentage change for the two years. Explain the drastic change and what this meant for the

    asked by Miranda on July 8, 2010
  13. Physics

    A 821-kg car stopped at an intersection is rear-ended by a 1810-kg truck moving with a speed of 11.5 m/s. If the car was in neutral and its brakes were off, so that the collision is approximately elastic, find the final speed of both vehicles after the

    asked by Daniel on November 19, 2011
  14. math

    Find the maturity value of the undiscounted promissory note that states that Phillip Esterey borrowed $4,000 for a period of 7 months with ordinary interest at 7%. The date of the note was December 17, 2008. The maturity date was July 17.

    asked by Taylor on October 13, 2013
  15. math

    Students in an English class need a mean of at least 90 points on four tests to earn an A. One student has scored 87,92,85. Write and solve an inequality to find what score the student needs on the next test to earn an A. 020714 I think that's it xDDD

    asked by yo katie p on March 1, 2007
  16. Physics

    A 821-kg car stopped at an intersection is rear-ended by a 1810-kg truck moving with a speed of 11.5 m/s. If the car was in neutral and its brakes were off, so that the collision is approximately elastic, find the final speed of both vehicles after the

    asked by Daniel on November 19, 2011
  17. Physics

    A force F = 119 N acts at an angle α = 31◦ with respect to the horizontal on a block of mass m = 22.5 kg, which is at rest on a horizontal plane. The acceleration of gravity is 9.81 m/s 2 . If the static frictional coefficient is µs = 0.72, what is the

    asked by andrew on January 11, 2016
  18. physics

    A disk with a mass of 16 kg and a radius of 41 cm is mounted on a frictionless horizontal axle. A string is wound many times around the disk and then attached to a 70-kg block, as shown in the figure. Find the acceleration of the block, assuming that the

    asked by ravi on November 7, 2012
  19. PHYSICS

    Two blocks of masses m1 = 4.5kg and m2 = 6.5kg resting on a frictionless area connected by light inextensible chord as shown. A horizontal force F of 33.0 N directed to the right is applied to m1 as shown. Find (A) acceleration and (B) tension of the

    asked by Camz on December 1, 2015
  20. calculus

    Find the formula for the described function and state its domain. An open rectangular box with a volume of 8 cubic meters has a square base. Express the surface area of the box as a function of S(x) of the length x of a side of the base.

    asked by DJ on October 27, 2010
  21. Math

    From a point 120m from the foot of a building, the angles of elevation of the top and bottom of the flagpole are 49 degrees and 46 degrees respectively. Find the height of the flagpole (answer 13.8m) I couldn't get the answer because I thought the question

    asked by Anonymous on May 21, 2015
  22. finite math

    A probability experiment was conducted in which the sample space of the experiment is S={1,2,3,4,5,6,7,8,9,10,11,12}, event F= {6,7,}, and event G={9,10,11,12}. Assume that each outcome is equally likely. List the outcomes of F and G?. find P(F or G) by

    asked by carol on June 18, 2014
  23. finite math

    A probability experiment was conducted in which the sample space of the experiment is S={1,2,3,4,5,6,7,8,9,10,11,12}, event F= {6,7,}, and event G={9,10,11,12}. Assume that each outcome is equally likely. List the outcomes of F and G?. find P(F or G) by

    asked by carol on June 17, 2014
  24. MATH

    Find the component form and the magnitude of the vector v. (Express the components of v as fractions. Round the magnitude of v to four decimal places.) Initial Point: (7/2, -3) Terminal Point: (1, 2/7) v=< , > ||v||= the answers i got are: v=

    asked by ghost on March 2, 2019
  25. math

    you purchase an suv for $26,000. A year later the car is worth only $24,800. If the value of the car continues to depreciate at that rate, a. find the linear equation that determines the value of the car based on the number of years you own it. b. when

    asked by jen on March 7, 2010
  26. Physics

    A 21.3-g bullet is fired from a rifle. It takes 3.77 × 10-3 s for the bullet to travel the length of the barrel, and it exits the barrel with a speed of 779 m/s. Assuming that the acceleration of the bullet is constant, find the average net force exerted

    asked by Kendall on October 11, 2012
  27. pysics

    Find the velocity of (a) a cylinder and (b) a ring at the bottom of an inclined plane that is 1.55 m high. The cylinder and ring start from rest and roll down the plane. Hint: Carry out the calculation including the unknown parameters, and they may cancel

    asked by Demis on October 29, 2012
  28. physics

    A 4-m wooden platform weighing 160 N is suspended from the roof of a house by ropes attached to its ends. A painter weighing 640 N stands 1.2 m from the left-hand end of the platform. Find the tension in each of the ropes

    asked by joy on March 3, 2012
  29. Statistics

    The weights of male babies less than 2 months old in the United States is normally distributed with a mean of 11.5 pounds and a standard deviation of 2.7 pounds. Find the 80th percentile score for these weights. I don't have a table, I have to figure it

    asked by Jeri Jackson on February 25, 2014
  30. physics

    A velocity selector consists of electric and magnetic fields described by the expressions vector E = E k hat bold and vector B = B j hat bold, with B = 0.0140 T. Find the value of E such that a 670 -eV electron moving along the negative x axis is

    asked by Suhani on October 29, 2013
  31. physics

    Starting at rest at the edge of a swimming pool, a 72.0 kg athlete swims along the surface of the water and reaches a speed of 1.10 m/s by doing the work Wnc1 = +165 J. Find the nonconservative work, Wnc2 done by the water on the athlete. Thanx in advance.

    asked by jawn on October 21, 2009
  32. math

    a farmer has 200 yards of fencing to enclose three sides of a rectangular piece of property that lies next to a river. the river will serve as the fourth side. find the dimensions of property if the area is 3200 yards^2

    asked by Amber on September 5, 2012
  33. calc 3

    A woman walks due west on the deck of a ship at 4 mi/h. The ship is moving north at a speed of 15 mi/h. Find the speed and direction of the woman relative to the surface of the water. (Round your answers to one decimal place.)

    asked by abby on September 1, 2012
  34. Physics

    A partially filled bucket of water sits on a scale and its weight is 3.5 N. A piece of metal is suspended from a thread and completely immersed in the bucket (but does not touch the bottom). The scale now reads 7.5 N. Find the volume of the metal.

    asked by Anonymous on May 28, 2016
  35. Chemistry

    Chlourine monoxide reacts with flourine gas to give a new unknown gas that contains Cl, O and F. In an experiment you find that 0.15476 g of the new gas has a preasure of 17mmHg ina 1850 mo flak at 21ºC. What is thd identity of the unknown gas?

    asked by Anonymous on November 1, 2017
  36. PHYSICS

    WHEN SIX PEOPLE WHOSE AVERAGE MASS IS 84 KG SIT DOWN IN A CAR, THEY FIND THAT THE CAR DROPS .84 CM LOWER ON ITS SPRINGS. THEN THEY HAVE GET OUT OF THE CAR AND BOUNCE IT UP AND DOWN. THE ACCELERATION OF GRAVITY IS 9.8 M/S^2. WHAT IS THE FREQUENCY OF THE

    asked by KOCHU on January 13, 2013
  37. math

    A researcher wishes to estimate the proportion of college students who cheat on exams. A poll of 490 college students showed that 33% of them had, or intended to, cheat on examinations. Find the margin of error for the 95% confidence interval.

    asked by Vivian on July 15, 2012
  38. Math

    A particle is moving at some constant speed. Use the following information to answer the following questions. s(t)=100/t©÷+12; t¡Ã0; see represents feet and t represents seconds a)Find the velocity and acceleration equations for this particle. b)When

    asked by Kelsey on March 6, 2008
  39. Math

    A monument consists of two cubical blocks of granite, the smaller resting on the larger. The total height of the monument is 5 feet, and the area of the exposed surface is 61 square feet. Find the dimensions of the blocks. Help please>.< Thank you in

    asked by Lina on June 1, 2014
  40. trig

    A tree on a hillside casts a shadow c ft down the hill. If the angle of inclination of the hillside is b to the horizontal and the angle of elevation of the sun is a, find the height of the tree. Assume a = 48°, b = 18° c = 235 ft. (Round your answer to

    asked by Anonymous on November 29, 2012
  41. math

    the Nile River is the longest river in the world that 4160 miles a group of explorers travel along the entire now in xx days they traveled the same distance each day write an algebraic expression to find out each day's distance

    asked by karla on October 1, 2015
  42. Pre-calc Math

    A tree on a hillside casts a shadow c = 210 ft down the hill. If the angle of inclination of the hillside is b = 21° to the horizontal and the angle of elevation of the sun is a = 51°, find the height of the tree. (Round your answer to the nearest foot.)

    asked by Anthony on December 23, 2016
  43. Calculus

    a police helicopter is flying at 200 km/hr at a constant altitude of 1 km above a straight road. The pilot uses radar to determine that an oncoming car is at a distance of exactly 2 km from the helicopter, and that this distance is decreasing at 250 km/hr.

    asked by Alex on November 8, 2010
  44. Chem 1

    Why is this phrase, “Lewis Structure” a misnomer? I've googled it... and I can't seem to find an answer. Any suggestions as to where I can read some info on that? Lewis implies ionic bond, structure implies fixed covalent bonds. Screw you, that's

    asked by Rossi on October 25, 2006
  45. math

    the area of a trapezoid cornfield IOWA is 18000 sq m The100 meter side IO is parallel to the 150 meter side WA. This field is divided into four sections by diagonal roads IW and OA. Find the areas of the triangular sections

    asked by narender on October 27, 2016
  46. HELP MATH

    I am stuck on a probability question. Please help and tell me the easiest way to find the answer to this.. I am confused and keep getting 5/6 A fair die is rolled..what is the probability of rolling an odd number or a number less than 3? the actual answer

    asked by HM on November 2, 2011
  47. math URGENT!!!!!!

    a 12x12-inch square is divided into n^2 congruent squares by equally spaced lines parallel to its sides. circles are inscribed in each of the squares. find the sum of the areas of the circles... please answer and explain how you got this answer!!!

    asked by dss on November 15, 2012
  48. Math

    Every time Jim shoots a free throw in basketball, he has an 80% chance of making the shot. He is given 3 free throws. Find the probability of each event. a) misses all 3 shots b) misses the first two shots and makes the third. Can someone please explain to

    asked by Cherie on April 17, 2013
  49. Algebra

    The length of a rectangle is 3 times the width. If the length is increased by 4 cm and the width is decreased by 1cm the parimeter will be 102 cm. find the dimensions of the original rectangle. I don't know the equation, please show the work. Not just the

    asked by B on October 16, 2014
  50. algebra

    a survey of 2,000 people was given to find their mode of transportation to work each day. the pie chart gives the results of people surveyed Bike 3.8% taxi 9.8% walk 3.4% bus 14.6% drive 68.4% how many traveled by bike to work?

    asked by lisa on October 31, 2015
  51. Help with math

    I am stuck on a probability question. Please help and tell me the easiest way to find the answer to this.. I am confused and keep getting 5/6 A fair die is rolled..what is the probability of rolling an odd number or a number less than 3? the actual answer

    asked by HM on November 2, 2011
  52. 7th Grade Math

    If a diameter of a circle (which is 18 inches) is tripled, can the expression 9 (254.34 in square) be used to find the new circle? I know the answer is yes but I can't figure out how you work it! I come with 9(1,107.36 in square) but apparently that is not

    asked by Daniel on April 30, 2013
  53. social studies

    can someone help me find a website for this timeline, please. create a timeline tracking the following major themes/paradigm shifts in American history from the beginnings of the Cold war in 1945 to the end of the Cold war in the early 1900's

    asked by dellaine on April 11, 2010
  54. Chemistry

    Using the total volume at endpoint (51.98mL) and the fact that the concentration of CrO4 ^2- due to Mohr's indicator is 0.26 M, find the actual concentration of CrO4^ 2- at the endpoint (or at the instant just before Ag2CrO4 begins to form). Any help I am

    asked by josh on April 2, 2012
  55. calculus

    The beacon on a lighthouse makes one revolution every 20 seconds. The beacon is 300 feet from the nearest point, P, on a straight shoreline. Find the rate at which the ray of light moves along the shore at a point 200 feet from P.

    asked by fati on June 16, 2012
  56. Mathematics

    If Z= [tan 2x -i(sin x+cos x)]/[1+i sin x] is completely imaginary, find x.(0

    asked by Kimasha on May 20, 2017
  57. math

    Forces are applied to two ropes which are attached to the bumper of a stalled car. If F1 = 100 lbs at an angle of θ1 = 58 degrees, find the necessary magnitude and direction of force F2 so that the resultant force is 190 lbs in the direction shown.

    asked by nick on December 6, 2013
  58. Simple Interest

    Hi guys, I'm new here, my name is Markus. Can you help me with one simple question? I think I know what it is, though. If any of guys respond back, thank you! $300 at 5 annual interest for 7 years. Find the simple interest earned in the account. a. $214.29

    asked by Markus on January 2, 2016
  59. Calculus: Area

    Can someone look at my work and see what i did wrong. I did this 100 times but i keep getting it wrong Sketch the region enclosed by the given curves. Decide whether to integrate with respect to x or y. Then find the area of the region. 2y=3x^(1/2) , y=4

    asked by jasmineT on April 28, 2012
  60. Math

    Find the resultant in magnitude and direction of forces 10N, 20N, 30N, 40N, acting respectively in the direction 60,120,180 and 270. I tried drawing out the forces with the respective angles but the angles are more than 360.#confused

    asked by Shade on November 26, 2016
  61. chem II

    starting with 15.0 ml of 0.370M of organic base pyridine C5H5N a titration is carried out using 0.100M HCL. how do i find the pH before titration, after adding 22.0mL of the acid , at equivalent point and after 41.0mL is of acid is added? where do i begin?

    asked by victoria on May 2, 2013
  62. college algebra

    A propane tank has the shape of a circular cylinder with a hemisphere at each end. The cylinder is 6 feet long and volume of the tank is 5pie cubic feet. Find, to the nearest thousandth of a foot the length of the radius x.

    asked by Missy on April 16, 2012
  63. calculus

    1)A function g is defined for all real numbers and has the following property: g(a+b) - g(a) = 4ab+2b2 find g'(x) A)4 B)-4 C)2x^2 D)4x E)does not exist not so sure where to start 2)If d/dx[f(x)] = g(x) and d/dx[g(x)] = f(3x, then d^2/dx^2 [f(x^2)] is

    asked by Kevin on November 15, 2012
  64. Sciences

    A model airplane whose mass is 875 grams flies in a horizontal circle of radius 3.46 m at the end of a string which is at an angle of 10.5o below the horizontal. Find: a) The tension in the string. b) The speed of the airplane. I have answers but I am

    asked by TCC on July 2, 2013
  65. physics II

    A rocket is launched vertically from ground with a constant acceleration. If the rocket emits a burst of sound every five seconds after launching, find the difference of intensity levels observed at the launching site for the first and the second bursts of

    asked by ANA on January 31, 2015
  66. Physics

    a pilot must fly a destination 520 km away in a direction of N30 degree E. The air speed of the plane is 320Km and the wind speed is 85 km/h E20 degree Suth. Find the heading of the plane and the time for the trop.

    asked by Jessica on October 4, 2009
  67. phys

    Heat Q flows spontaneously from a reservoir at 481 K into a reservoir at 298 K. Because of the spontaneous flow, 2760 J of energy is rendered unavailable for work when a Carnot engine operates between the reservoir at 298 K and a reservoir at 249 K. Find

    asked by Redgy22 on December 2, 2012
  68. Calculus

    Find normals to the curve xy+2x-y=0 that are parallel to the line 2x+y=0 I have the answer: at(-1,-1), y=-2x-3, and at (3,-3), y=-2x+3 How do we get this? Thanks. xy + 2x - y=0 x dy/dx + y + 2 - dy/dx=0 dy/dx (x-1)= -y-2 dy/dx= - (y+2)/(x-1) The normal to

    asked by Jen on October 16, 2006
  69. calculus1

    If C(x) = 13000 + 500x − 3.2x2 + 0.004x3 is the cost function and p(x) = 2900 − 8x is the demand function, find the production level that will maximize profit. (Hint: If the profit is maximized, then the marginal revenue equals the marginal

    asked by john on November 6, 2017
  70. Math

    Janice and Thomas are roller blading around Sampson Pond. It takes them 4 minutes to complete a lap. Write and solve an equation to find how many laps they can complete in one hour if they continue roller blading at this pace.

    asked by Anonymous on September 6, 2018
  71. Calculus

    How do I find the limit of (1+sin(pi times x))^(1/x) as x approaches 0? I tried using wolframalpha, but am unable to understand their steps. My thinking is that you set y=the limit and use L'hopital's rule a couple times. The answer I got was y=e^0--->y=1,

    asked by W on January 19, 2012
  72. Physics

    Electrons are accelerated though a potential of 60V and then from a beam that hits two slits separated by 2.5x10^-8m. (a) What is the wavelength of these electrons (hint: first find the momentum)? (b) How far is the second order bright spot from the center

    asked by genius on April 28, 2012
  73. physics

    The shell’s trajectory curves downward because of gravity, so at the time t = 0.217 s the shell is below the straight line by some vertical distance ∆h. Find this distance ∆h in the absence of air resistance. The acceleration of gravity is 9.8 m/s 2

    asked by Noah on September 2, 2012
  74. Precalculus

    The instruments with an aircraft show that it is headed east with an airspeed of 180 mph. After 2 hours, the aircraft is actually 375 miles east and 20 miles north of its starting point. Find the wind speed and its direction.

    asked by Merry on March 26, 2017
  75. physics - i need A.S.A.P

    An object of mass 1.5 kg is placed on a rough horizontal surface, as shown in Figure 1. Force F acts on the object. When the magnitude of F is 10 N, the object just begins to slide. Determine the coefficient of static friction between the object and the

    asked by mimi on May 2, 2011
  76. CALC HARD...

    Suppose that 430 ft of fencing is used to enclose a corral in the shape of a rectangle with a semicircle whose diameter is a side of the rectangle. (In the figure below, the blue outline represents the fencing.) Find the dimensions of the corral with

    asked by HELP on October 29, 2010
  77. calculus

    A conical drinking cup is made from a circular piece of paper of radius R inches by cutting out a sector and joining the edges CA and CB. Find the radius, height and volume of the cone of greatest volume that can be made this way.

    asked by Linda on April 8, 2015
  78. Physics 11

    A 62kg cyclist changes the speed of a 12kg bicycle from 8.2m/s to 12.7m/s. Determine the work done. I used change in energy = work to find work against inertia which was 3479.85 Then I used V^2=V.^2 + 2ad to get ad=47.025 I then used W=mad to get work

    asked by Kayla on May 23, 2017
  79. chemistry

    Data: SO2(g)+ 1/2O2(gas)forms SO3(g)Delta H = -99.1 kJ. Given the above data, calculate the enthalpy change when 89.6 g of SO2 is converted to SO3. Is this a grams to moles conversion or what? I can't find any examples of this type of calculation.

    asked by lavonne on October 27, 2010
  80. Geometry

    I've been working forever to figure out this problem! If two flagpoles are 10m and 70m tall and are 100m apart, find the height of the point where a line from the top of the first to the bottom of the second intersects a line from the bottom of the first

    asked by Spencer on January 16, 2008
  81. life orientation

    name two institutions/community otrganizations that are involved in supporting or giving redress to these disasters.Explain how those organizations are involved in providing a safe and healthy environment. (suggestion:Find out about NGO's or other

    asked by samuel masanabo on September 25, 2013
  82. Group Discussion

    Hi, I have to lead a group discussion with the class. Any ideas on how to get my classmates involved? The person who just did it divided the class into two and let them discuss on a topic and also gave each person either a question or an answer and let

    asked by Group on October 3, 2008
  83. Algebra 2

    The height h(t), in feet, of an airborne tee-shirt t seconds after begin launch can be approximated by h(t)= -15t^2+120t+10,0

    asked by CC on October 18, 2012
  84. Physics

    In an Atwood machine, one block has a mass of M1 = 520 g and the other has a mass of M2 = 320 g. The frictionless pulley has a radius of 4.6 cm. When released from rest, the heavier block moves down 51 cm in 1.00 s (no slippage). What is the tension T1?

    asked by Spencer on November 5, 2011
  85. algebra

    Gemma recently rode her bicycle to visit her friend who lives 6 miles away. On her way there, her average speed was 16 miles per hour faster than on her way home. If Gemma spent a total of 1 hour bicycling, find the two rates.

    asked by Derek on May 2, 2016
  86. calculus

    A conical drinking cup is made from a circular piece of paper of radius R inches by cutting out a sector and joining the edges CA and CB. Find the radius, height and volume of the cone of greatest volume that can be made this way

    asked by Linda on April 8, 2015
  87. Physics

    In an Atwood machine, one block has a mass of M1 = 520 g and the other has a mass of M2 = 320 g. The frictionless pulley has a radius of 4.6 cm. When released from rest, the heavier block moves down 51 cm in 1.00 s (no slippage). What is the tension T1?

    asked by Morgan on November 5, 2011
  88. Physics

    A technician performs an experiment on a glass slap and finds that the critical angle for total internal reflection at the glass (refractive index n1) air (refractive index n2 = 1) interface is 43 +/- 2 deg. Find n1 and the associated error.

    asked by Lewis on January 27, 2012
  89. Please Help!!!!!!

    A hot hair balloon is rising vertically 20 ft/sec while the wind is blowing horizontally at 15 ft/sec. Find the speed v of the balloon and the angle x it makes with the horizontal. I know how to solve this problem, but I don't understand why or how you

    asked by Desperate!!!! on November 21, 2011
  90. math

    A researcher wishes to estimate the proportion of college students who cheat on exams. A poll of 490 college students showed that 33% of them had, or intended to, cheat on examinations. Find the margin of error for the 95% confidence interval.

    asked by jennifer on May 6, 2012
  91. math(trig)

    1) What's the linear velocity of a point on the tip of a 6-ft propeller turning at 1200 revolutions per min? 2) A gear is driven by a chain that travels 90m/min. Find the radius of the gear if it makes 50 revolutions per minute.

    asked by confused on December 6, 2010
  92. PHYSICS

    A velocity selector consists of electric and magnetic fields described by the expressions vector E = E k hat bold and vector B = B j hat bold, with B = 0.0140 T. Find the value of E such that a 670 -eV electron moving along the negative x axis is

    asked by help!! on October 30, 2013
  93. calc (with through steps)

    A conical drinking cup is made from a circular piece of paper of radius R inches by cutting out a sector and joining the edges CA and CB. Find the radius, height and volume of the cone of greatest volume that can be made this way

    asked by Linda on April 9, 2015
  94. calc (plz, with steps and explanations)

    A conical drinking cup is made from a circular piece of paper of radius R inches by cutting out a sector and joining the edges CA and CB. Find the radius, height and volume of the cone of greatest volume that can be made this way

    asked by Linda on April 9, 2015
  95. physics

    a mass of 5 kg is whirled in a horizontal circle at one end of a string 50 cm long. the other end being fixed. if the string when hanging vertically will just support a load of 200 kg mass without breaking , find the maximum whirling speed in m/s

    asked by Nawras on October 28, 2014
  96. physics

    Two point sources produce waves of the same wavelength and are completely out of phase (that is produces a crest at the same time as the other produces a trough). At a point midway between the sources, would you expect to find a node or an antinode? Why?

    asked by silly on May 2, 2011
  97. math

    ryan left the science museum and drove south gabriel left three hours later driving 42mph faster in s effort to catch up. after 2 hours gabriel finally caught up. find ryans speed

    asked by corinne on November 18, 2009
  98. physics

    Suppose a stone is thrown at an angle of 30 degrees below the horizontal, if it strikes the ground 57m away, find (a)the time of flight, (b)the initial speed, and (c) the speed and the angle of the velocity vector with respect to the horizontal impact.

    asked by Gail on October 16, 2011
  99. Math (Statistics)

    Hi! Can someone help me with these two questions? Thanks a bunch! :) 1.) What causes experimental probability to match theoretical probability? In theory heads and tails occur 50/50. 2.) Find a way to estimate the time to flip a coin 10,000 times; 100,000

    asked by Becky on January 23, 2015
  100. Chemistry

    Calculate the molarity of the HCl solution if 25.00ml of the acid are required to neutralize 1.00g of each of the following 1) KOH 2)Ca(OH)2 I calculated the molar mass of KOH which was 56.11 Then I took 1.00g/56.11 = 0.0178mol To find out the molarity I

    asked by Sarah on October 28, 2014

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