Popular questions and responses by Mariam
  1. Science

    A car starts from rest and moves with constant acceleration during the 5th second of its motion,it covers a distance of 36 meters. what is the acceleration

    asked on August 31, 2012
  2. Math

    V=Nh^2(r-h/3) make r the subject of the formular

    asked on July 15, 2020
  3. Mathematics

    How many litres of water will a cylindrical pipe hold if it is 1m long and 7cm in diameter

    asked on July 23, 2020
  4. Mathematics

    A cylinder water tank is 70cm in diameter. To being with, it is fullof water. A leak starts in the bottom so that it loses 10liters of water every hour. How long will it take for the water level to fall by 20cm

    asked on July 23, 2020
  5. Physics

    14. A racing car accelerates uniformly through three gears, changes with the following average speed: 20 for 2.0 s 40 for 2.0 s 60 for 6.0 s What is the overall average speed of the car?

    asked on September 14, 2012
  6. Science

    A ray of light approaches a jar of honey at an angle of 30.0 degrees. If the angle of refraction is 19.5 degrees, what is the refractive index of honey?

    asked on July 17, 2014
  7. Physics

    Problem 2- A 15 kg block is attached to a very light horizontal spring of force constant 400 N/m and is resting on a smooth horizontal table as shown in the figure below. Suddenly it is struck by a 3 kg stone traveling horizontally at 8 m/s to the right,

    asked on January 12, 2014
  8. Maths

    In a certain examination, 52 candidates offered biology, 60 history, 96 offered mathhematics , 21 offered biology and history, 22 offered both biology and mathematics, 16 mathematics and history. If 7 candidates offer all the three subjects find:(a) how

    asked on January 20, 2020
  9. math

    It takes 8 hours for 5 people to paint a room. How long would it take 4 people?

    asked on November 28, 2016
  10. Physics

    Problem 2- A 4 kg object is attached to a vertical rod by two strings, as in the Figure. The object rotates in a horizontal circle at constant speed 6 m/s. Find the tension in (a) the upper string and (b) the horizontal string.

    asked on November 23, 2013
  11. Physics

    If vector A=2i+3j-k and B=4i+2j-2k find vector x parallel to A but has magnitude of B

    asked on June 27, 2020
  12. math

    justin has a car that ca travel 77 1/2 miles with 3 1/10 gallons of gas. kim has a car that can travel 99 1/5 miles with 3 1/5 gallons of gas. How many miles can each person drive with one gallon of gas?

    asked on March 17, 2016
  13. physics

    A 200-loop coil of cross sectional area 8.5 cm2 lies in the plane of the page. An external magnetic field of 0.060 T is directed out of the plane of the page. The external field decreases to 0.020 T in 12 milliseconds. (a) What is the magnitude of the

    asked on May 21, 2020
  14. home economics

    Explain 5 subjects that are related to home economics

    asked on September 25, 2018
  15. college physics

    A water-skier is being pulled at a steady speed in a straight line. her mass plus the mass of the ski is 65 kg. the pull of the tow rope on her is 520 N. a...i) What is the vertical component Y of the push of the water on the ski?? ....ii) What is the

    asked on September 3, 2012
  16. physics

    A water-skier is being pulled at a steady speed in a straight line. her mass plus the mass of the ski is 65 kg. the pull of the tow rope on her is 520 N. a...i) What is the vertical component Y of the push of the water on the ski?? ....ii) What is the

    asked on September 3, 2012
  17. Calculus

    A farmer wants to divide his 2700 km2 of land into two separate pastures for his new horses by building a fence that will enclose both pastures. He wants one pasture to be twice the size as the other. What should the dimensions of the larger pasture be if

    asked on March 24, 2020
  18. Physics

    A shopper in a supermarket pushes a loaded cart with a horizontal force of 80.5N. If the cart has a mass of 33.8kg, how far will it move in 1.31s, starting from rest? The coefficient of friction is 0.12

    asked on November 17, 2017
  19. physics PLEASE HELP

    A little bumblebee accelerates uniformly at 1.5 m/s2 from rest to 22 m/s. Immediately upon reaching 22m/s, the brakes are applied and it stops 2.5 s later. Find the total distance traveled.

    asked on October 31, 2017
  20. Physics

    The city is trying to figure out how long the traffic light should stay yellow at an intersection. The speed limit on the road is 45.0 km/h and the intersection is 23.0 m wide. A car is traveling at the speed limit in the positive direction and can brake

    asked on October 12, 2017
  21. Calculus

    ∫1/(x2 − 2x + 8)3/2 dx

    asked on June 16, 2014
  22. Chemistry

    A student intend to prepare 200ml of 0.3M NaCl solution . The mass in gram of NaCl needed to prepare solution is ?!

    asked on April 20, 2014
  23. Chemistry

    A student mixed 40ml of 0.2m Na2co3 solution with 50 ml f 0.25M cacl2 solution , what is the except number of moles of naclkkw that I will be formed ?

    asked on April 20, 2014
  24. Physics

    Problem 4: A 250 g block is dropped onto a relaxed vertical spring that has a spring constant of k= 2.5 N/cm. The block becomes attached to the spring and compresses the spring 12 cm before momentarily stopping. While the spring is being compressed, (a)

    asked on December 1, 2013
  25. college physics

    in a pinball machine, a force of 24 N is used to compress a spring a distance of 0.080m. a. What is the potential energy stored in the spring? b. What is the maximum speed tha it van produve in a ball of mass 0.15kg?

    asked on September 7, 2012
  26. Math homework

    A boy spends 2/7 - 1/5

    asked on November 20, 2018
  27. Physics

    The United States and South Korean soccer teams are playing in the first round of the World Cup. An American kicks the ball, giving it an initial velocity of 3.6 m/s. The ball rolls a distance of 5.0 m and is then intercepted by a South Korean player. If

    asked on October 12, 2017
  28. math

    "Relative frequency" is the same as which of the following? frequency histogram cumulative frequency distribution proportion I think its proportion, am I right?

    asked on September 20, 2017
  29. math

    Why is there two different formulas, recursive and explicit. When do you use it?

    asked on March 5, 2017
  30. Math

    I am a seven digit number. I have the digit 3 in my ten thousands and tens places, and the digit 1 in all my other places. What number am I?

    asked on August 26, 2016
  31. Social Studies

    What year was Jamestown settled? What were the settlers looking for initially? What guaranteed their success?

    asked on October 1, 2015
  32. Math

    How do you graph mixed fraction from a table on a coordinate plane ?? Thanks

    asked on August 18, 2015
  33. Math

    How do you graph a function like y=2x+0.5 and y=0.5x+1?

    asked on March 2, 2015
  34. Math

    How can you graph y=2X +0.5 and y=0.5+1? Thank you

    asked on March 2, 2015
  35. Physics

    AN astronaut on the Moon has a mass (including his spacesuit and equipment) of 180 kg. the acceleration due to gravity on the Moon is 1.6 m/s2 (seconds squared). a) calculate his weight on the moon. the astronaut climbs 100m to the top of the crater . b)

    asked on November 17, 2014
  36. math

    hello im having problems with my math 1 Wells College in Aurora,New York was previously an all -girls college.In 2005,the college began to allow boys to enroll. By 2012, the ratio of boys to girls was 3 to 7. if there were 200 more girls then boys in 2012,

    asked on October 1, 2014
  37. science

    So the question is write down three examples of science in your everyday life. This was my answer: sound- compression wave, Baked goods- chemical reaction, Looking at mountains or ocean- earth science Please check my answer and see if this is good thank

    asked on September 29, 2014
  38. Physics

    Problem 3- A 10-g metal ball is moving to the left with a velocity of magnitude 0.4 m/s has a head-on, elastic collision with a larger 30-g metal ball moving to the right with a velocity of magnitude 0.2 m/s. a) Find the speed of the two balls after the

    asked on January 12, 2014
  39. Physics

    Problem 3- A 40 kg child swings in a swing supported by two ropes, each 3 m long. (a) If the tension in each rope at the lowest point is 350 N, a. find the child's speed at the lowest point. b. the force exerted by the seat on the child at the lowest

    asked on November 23, 2013
  40. algebra

    a physical education teacher was getting ready for gym class one day . he measured the circumference of the basketball to be 9 inches when it is filled with air . he then went on to pose the following question to his classes : use 3.14 A ) how much

    asked on February 18, 2013
  41. physics

    A=2i+3j-k, b=4i=2j-2k, find the vector x parallel to A but has magnitude of B

    asked on November 10, 2012
  42. medu

    RM 2000 was invested on 15march 2012. If the simple interest rate offered was 10% per annum, find the interest received on 29 August 2012 using A. Exact time and exact simple interest B. Exact time and ordinary simple interest C. Approximate time and exact

    asked on June 8, 2012
  43. Chemistry

    Ethylene glycol, HOCH2CH2OH, is used as antifreeze. It is produced from ethylene oxide, C2H4O, by the following reaction. C2H4O(g) + H2O(l) → HOCH2CH2OH(l) Use Hess's law to obtain the enthalpy change for this reaction from the following enthalpy

    asked on December 13, 2009
  44. Mathematics

    A man left of his estate in kerugoya to his wife and to each of his two sons the remainder was to be shared equally among his six brothers if the estate was worth shs 3456000 how much did each of those people get?

    asked on May 16, 2020
  45. mathematics

    Ten friends share 6 pizzas equally. What fraction of a pizza dose each friend get

    asked on May 11, 2020
  46. Calculas

    sand is poured from a conveyer belt onto pile at the rate of 36pi m^3/min. The ratio of the radius to height of the circular conical pile is 2:3. How fast is the height increasing 8 min after pouring began?

    asked on March 20, 2020
  47. Science

    Three point chatges are placed onthe x axis .Acharge of+2micro c at the100cm mark .what are the magnitude and direction of the electrostatic force which acts on the charge at the origin

    asked on March 20, 2019
  48. algebra 1

    Mr. Pilgrim has a turkey farm. he has one male turkey for every 17 female turkeys. if he has 289 females, how many males does he have?

    asked on November 22, 2018
  49. maths

    Simplify 9asquare_ msquare divided by msquare _2am_3asquare

    asked on October 27, 2018
  50. Physics

    Hello, I'm totally lost on how to solve this physics problem. Where/how do I insert the variables?? "Light travels from one material with a refractive index (n1=1.5) to another material with refractive index (n2=1.7). If it strikes the surface at a 45°

    asked on May 11, 2018
  51. calclus

    Is it possible to accurately approximate the speed of a passing car while standing in the protected front hall of the school? Task: Determine how fast cars are passing the front of the school. You may only go outside to measure the distance from where you

    asked on May 2, 2018
  52. physics - please help me!

    Hello! I'm having a bit of trouble trying to solve this physics problem. I'm not sure which equations to use or where or how to plug my variables: Robin Hood wishes to shoot an arrow through the open window of a tall castle wall. The window is 16m meters

    asked on April 10, 2018
  53. physics - help!

    A soccer ball is kicked with a speed of 22m/s at an angle of 35.0º above the horizontal. Can someone show me how to find how long the ball was in the air if the ball lands at the same level from which it was kicked?

    asked on April 10, 2018
  54. Physics - please help!

    Hello! I don't understand how to solve this physics problem, please help me: A projectile is launched at 15 degrees. The landing height is the same as the launch position. At what other angle can the projectile be launch to achieve the same horizontal

    asked on April 9, 2018
  55. Physics - please help!

    I don't understand how to answer this problem or even which equation to insert it into: "A Dancer leaps across the stage in a beautiful grand jete. The ballerina leaps at an angle of 45° and is able to jump a horizontal distance of 1.5m in 0.547s. What is

    asked on March 28, 2018
  56. Physics

    Hey, I'm a bit stuck on this question. "It has been observed that a certain star (S2) in the Sagittarius A* (meaning in the direction of the constellation Sagittarius) is orbiting a supermassive black hole. If the period of S2 is 16year and the distance

    asked on March 15, 2018
  57. Physics

    Hi! I'm a bit lost on this homework question. The question states "In one hand you hold a 0.2kg apple, in the other hand you hold a 0.95kg Pie. They are separated by 0.75m, what is the force of gravity of the apple on the pie and what is the force of

    asked on March 15, 2018
  58. Physics - last question I'm stuck on!

    A pellet is fired through two circular plates .8 m apart, both rotating at -95rad/s. The angular displacement of second bullet hole is 82° from the first bullet hole. Calculate the bullet’s speed in m/s. If someone could help me see where to insert the

    asked on February 22, 2018
  59. Physics - please help!

    I don't understand this: Russian ice skater, Alina Zagitova, spins her way to projected Gold in the 2018 Olympics. During one particular spin, she moves from a camel spin that rotates at about 95. RPM to a tight spin. If her rotational inertia changes from

    asked on February 22, 2018
  60. Physics

    Can someone help me do this? I'm not sure where to insert the numbers nor in which equation. The tires on your truck have 0.35 m radius. In a straight line, you drive 2600 m. What is the angular displacement of the tire, during this trip? Would the angular

    asked on February 22, 2018
  61. Physics

    I'm lost on this problem too! A 70kg stunt driver rounds a circular corner at 96km/hr (convert to m/s). The centripetal force on the driver is 856N. Calculate the radius in meters of the path that the driver took around the circular corner.

    asked on February 21, 2018
  62. Physics

    I don't understand this. A can filled with sand has a mass of 0.45kg is swung overhead in a horizontal circle of radius 0.6m at a constant rate of 2.5 revolutions per second. Find the angular momentum of the rock.

    asked on February 21, 2018
  63. Physics

    Can someone help me solve this problem? This example problem will help me solve the actual homework problems If an 0.6kg apple is dropped from 0.5m height onto a seesaw and flips up a 0.25kg kiwi. To what height does that kiwi reach. Assume all the energy

    asked on February 1, 2018
  64. Chemistry

    Radon-222 has a half-life of 3.8days. What gram of radio isotopes will remain after 11.4days if you started out with 16 grams of the sample?

    asked on January 24, 2018
  65. Pre-Calculus

    Write the following expression as the sine, cosine or tangent of an angle. cos 3x cos 2y + sin 3x sin 2y

    asked on January 24, 2018
  66. Pre-Calculus

    So I'm given a general equation and am expected to get the location on the unit circle, the period, and the general solution to it. The equation is (3cot^2)2x-1 = 0. I've gotten it down to (cot^2)2x = 1/3 but I have no clue what to do next. Please help!

    asked on January 21, 2018
  67. Physics

    Find the force necessary to stop a 900 kg jetta traveling at +25 m/s in a time of 5.0 seconds.

    asked on January 16, 2018
  68. Physics

    An truck with a mass of 3500 kg travels with a velocity of 22.0 m/s. Find the momentum.

    asked on January 16, 2018
  69. Pre-Calculus

    Umm, how do I find this? with work? Use a calculator to evaluate the function at the indicated value of x. Round your answer to four decimal places. f(x) = 3 ln x x = 0.32

    asked on November 8, 2017
  70. Physics please hELP

    A pumpkin is thrown upwards at a speed of 27.5 m/s and from a height of 2 m above the ground. How long before it hits the ground and smashes? Not sure where to begin with this.

    asked on November 1, 2017
  71. Physics

    A sailboat is moving across the water at 3.0 m/s. A gust of wind fills its sails and it accelerates at a constant 2.0 m/s2. At the same instant, a motorboat at rest starts its engines and accelerates at 4.0 m/s2. After 3.0 seconds have elapsed, find the

    asked on October 12, 2017
  72. Physics

    A rail gun uses electromagnetic energy to accelerate objects quickly over a short distance. In an experiment, a 2.00 kg projectile remains on the rails of the gun for only 2.10x10^-2 s, but in that time it goes from rest to a velocity of 4.00×10^3 m/s.

    asked on October 12, 2017
  73. Another physics please

    Rex flips a coin vertically upwards with an initial velocity of 0.262m/s. Determine the height to which the coin will rise above the initial height. At what velocity is the coin moving when Rex catches it.

    asked on October 9, 2017
  74. Physics please

    A tennis ball is tossed up off a building with a velocity of 22m/s. It takes 6.4s to reach the ground. How high is the building and what is the maximum height of the tennis ball?

    asked on October 9, 2017
  75. Pre-calc

    how can I divide (3+4i)/(2-5i)?? If there's work, that would help me too

    asked on October 6, 2017
  76. Physics

    Jeff tosses a can of soda pop to Karen, who is standing on her 3rd floor balcony a distance of 8.5m above Jeff’s hand. Jeff gives the can an initial velocity of 16m/s, fast enough so that the can goes up past Karen, who catches the can on its way down.

    asked on October 3, 2017
  77. Physics

    The ceiling of a school gymnasium is a distance of 20m. You toss a ball 1.5m from the ground. What is the maximum initial velocity you can toss the ball and have it just miss the ceiling?

    asked on October 3, 2017
  78. Physics

    George drops a stone from atop a cliff of 25m. How long does it take to hit the ocean below, what velocity is it travelling when it gets there?

    asked on October 3, 2017
  79. Physics

    Roger tosses a ball straight upward at a velocity of +32m/s, calculate the maximum height of the ball and the time to get to the maximum height.

    asked on October 3, 2017
  80. Pre-Calculus

    When buying gasoline, you notice that 14 gallons of gasoline is approximately the same as 53 liters. Use this information to find a linear model that relates gallons to liters. Then use the model to find the number of liters in 25 gallons. Round your

    asked on October 3, 2017
  81. Pre-Calculus

    If w varies directly as z and w = 9 when z = -6, find w when z = 3. a) 0 b) -4.5 c) -2 d) 4.5

    asked on October 3, 2017
  82. Pre-Calculus

    True or false: Suppose that y varies directly as x. If y is 5 when x is 30, the constant of variation is 150.

    asked on October 3, 2017
  83. Pre-Calculus

    True or false: P varies directly as Q can be written as P = kQ.

    asked on October 3, 2017


    asked on September 22, 2017
  85. Statistics

    study looked at the effects of light on female mice. Fifty mice were randomly assigned to a regimen of 12 hours of light and 12 hours of dark (LD), while another fifty mice were assigned to 24 hours of light (LL). Researchers observed the mice for two

    asked on September 12, 2017
  86. Statistics

    A statistics class is made up of 60% women and has 21 women in it. What is the total number of students in the class?

    asked on September 12, 2017
  87. math

    So for this question it says, the graph of the function f(x)= radical of x+4 is shown. The domain of the function is 1) {x|x is greater than 0} 2) {x|x is greater or equal to 0} 3) {x|x is greater than -4} 4) {x|x is greater than or equal to -4} I know

    asked on May 25, 2017
  88. math

    When a number is subtracted under the radical which way do you move the graph?

    asked on April 20, 2017
  89. math

    I was just wondering, what is the difference between an arithmetic sequence and a geometric sequence?

    asked on March 2, 2017
  90. Physics

    A uniform metre rule is balanced at the 35cm mark when a mass of 500g is placed at the 20cm mark .determine the mass of the rule ..

    asked on December 1, 2016
  91. History

    What is fascism? Thank you!

    asked on October 12, 2016
  92. Health!

    What motion does a saddle joint allow? What movement does a pivot joint allow? (please don't say pivotal) Thanks. :)

    asked on October 6, 2016
  93. Math

    Which Polygon will Always Be Irregular? A.TRIANGLE B.TRAPEZOID C.SQUARE D.HEXAGON

    asked on February 23, 2016
  94. Algebra

    75% of the students on academic team earned 6 honors on the state examinations. the rest of the students on the team passed the state examinations. there were zero. if 30 students passed the ecam with honors, which proportion can be used to fun the total

    asked on February 2, 2016
  95. Algebra

    a car rental company has two rates. The first rate is 45$ per day plus 29.5 cents per mile the second rare is 90$ per day plus 0.07 per mile. If you rented at the 90$ rate, how many miles you would need to drive to break even?

    asked on February 2, 2016
  96. chemistry

    A 20.00 g sample of metal is warmed to 165˚C in an oil bath. The sample is then transferred to a coffee cup calorimeter that contains 125.0 g of water at 5.0˚C. The final temperature of the water is 8.8˚C. mrtal water m=20g m=125g t1=165c t1=5 c=?

    asked on January 11, 2016
  97. math

    When MacNeil says that much of television news is “machine gunning with scraps,” he means that

    asked on October 30, 2015
  98. chemistry

    How many liters of hydrogen gas are produced during an enthalpy change of -50kJ, assuming STP conditions? 1L= 1kg zn+ hno3 yields znn03 + 1/2 h2 +100kJ -50 kj x (1mol h2/ 100kj) X (2.02g / 1 mol) h2 ) = 1.01 g please help tried to get the answer but it it

    asked on September 21, 2015
  99. ela

    What are the advantages of living in the society of fahrenheit 451

    asked on September 7, 2015
  100. chemistry

    A solution of KOH is prepared by dissolving 2.00 g of KOH in water to a final volume of 250 ml of solution what volume of this solution will neutralize 20.0 ml of 0.115 mol/L sulfuric acid? amount of KOH= 2.00g(1mol of KOH/ 56.01g)= 0.357 moles

    asked on September 2, 2015


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