Most 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. 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
  3. home economics

    Explain 5 subjects that are related to home economics

    asked on September 25, 2018
  4. 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
  5. Math

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

    asked on February 23, 2016
  6. 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
  7. math

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

    asked on October 30, 2015
  8. 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
  9. 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
  10. 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
  11. 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
  12. 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
  13. 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
  14. 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
  15. 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
  16. 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
  17. 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
  18. 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
  19. 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
  20. 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
  21. 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
  22. 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
  23. 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
  24. 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
  25. 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
  26. physics

    A hose ejects water at a speed of 2m/s through a hole of area 0.01m2.if the water strikes a wall normally,calculate the force on the wall in Newtons,assuming the velocity of water nomal to wall is zero after collision.

    asked on February 16, 2012
  27. Chemistry

    In the. Reaction (Na2co3+CaCl2-->2NaCl+caco3) The precipitate is :

    asked on April 20, 2014
  28. 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
  29. 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
  30. 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
  31. Physics

    A roller-coaster car has a mass of 500 k when fully loaded with passengers. If at point a the forces exerted by the truck on the car is 15000 What is the acceleration at point A?

    asked on November 30, 2013
  32. 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
  33. 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
  34. Physics

    A400 N child is swing that is attached tow ropes 2m long , find the gravitational potential energy of the child-earth system relative to the red line level when ropes make an angle with the vertical .

    asked on December 4, 2013
  35. 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
  36. 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
  37. 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
  38. 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
  39. physics PLEASE HELP ME

    A ball rolling down a hill was displaced at 19.6m while uniformly accelerating from rest. If the final velocity was 5.00 m/s what was the rate of acceptation?

    asked on October 10, 2013
  40. Physics

    A light spiral spring is suspended from its upper end. A mass of 7.5*10^-2, hung from the lower end produces an extension of 0.15 m. The mass is pulled down to a furthur 8.0*10^-2 m and released so that it oscillates calculate the spring constant.

    asked on September 17, 2012
  41. 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
  42. world problem

    chloe collected 4 times as many bags of cans as her friend. if her friend collected 1/6 of a bag how much did chloe collect

    asked on November 10, 2014
  43. 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
  44. 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
  45. 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
  46. 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
  47. college physics

    A 2000kg van and a 1500 kg car both travelling at 40ms^-1 in opposite directions collide head on and lock together. what are their speed and direction immediately after the collision?

    asked on September 7, 2012
  48. 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
  49. 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
  50. 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
  51. 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
  52. 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
  53. Math homework

    A boy spends 2/7 - 1/5

    asked on November 20, 2018
  54. 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
  55. 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
  56. chemisty

    volume of water delivered using a buret has a mass of 2.67 g. What was the final volume reading on the buret if the inital volume reading was 0.10 ml? [assume the density of water is 1.00g/mL]

    asked on February 20, 2013
  57. Ela

    Can you check if my answers are correct because i am having trouble with it? The Kingdoms End I stand at the edge of the sea, watching waves wash onto the sand. White foams spills over my feet into the moat of an abandoned castle. The king and his court

    asked on April 12, 2015
  58. 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
  59. 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
  60. 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
  61. 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
  62. 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
  63. 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
  64. Chemistry

    1.2g of NaCl as used to prepare 200 ml solution , what is the molar concentration of NaCl in solution ?

    asked on April 20, 2014
  65. 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
  66. physical

    A wheel has radius of 0.25 m rotating at 2.08 rad/s. What is the tangential speed of a particle at its edge

    asked on January 22, 2013
  67. maths

    Simplify 9asquare_ msquare divided by msquare _2am_3asquare

    asked on October 27, 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. 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
  70. 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
  71. 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
  72. Math

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

    asked on March 2, 2015
  73. Physics

    Problem 3- A block of mass m1 = 4 kg moves from rest under the influence of a varying force F(x) = 4x + 38, where F is in newton and x is in meters, on a rough horizontal surface having a coefficient of kinetic friction of 0.2. The block is connected by a

    asked on December 1, 2013
  74. 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
  75. 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
  76. 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
  77. Pre-Calculus

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

    asked on October 3, 2017
  78. science

    science questions:Look around your house and make a list o different kinds of containers that use insulation to keep foods hot or cold. If possible, describe the type of insulators used in each container. I don't know which containers in my house that uses

    asked on May 12, 2015
  79. Physics

    Two forces FA and FB are applied to an object whose mass is 9.53 kg. The larger force is FA. When both forces point due east, the object's acceleration has a magnitude of 1.43 m/s2. However, when FA points due east and FB points due west, the acceleration

    asked on April 11, 2014
  80. 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
  81. 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
  82. 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
  83. Ela

    What are some reading strategies or tips I can use for the Ela state exam?

    asked on April 13, 2015
  84. ELA

    So I am studying for the Ela state exam and i am writing down some notes... but i am still not sure what does personification mean and what are the examples after searching online. Someone please tell me what does it mean...

    asked on April 13, 2015
  85. math

    A rectangle has a length of 6x+3 units and a width of 8 units. Write a simplified expression for the area, in square units, of this rectangle. So, my answer was 9x+8 please tell me is this correct... Thank you

    asked on April 8, 2015
  86. earth science

    The active sections that are located along fault lines are called

    asked on November 19, 2014
  87. Science

    What is one qualitative factor and one quantitative factor that affect the refraction of light as it passes from one medium to another?

    asked on July 17, 2014
  88. math

    a parabolic bridge over a road is 4 meter tall 4 meter wide and 5 meter long determain the maximum height of a 2 meter truck can drive under the bridge

    asked on February 5, 2014
  89. chemistry

    What is the density of a 28.87 g irregularly shaped object if the initial volume of water was 24.7 ml and the volume rose to 64.1 ml after the object was added?

    asked on February 20, 2013
  90. chemistry

    What is the density of a block of unknown material with a mass of 13.26 g if the dimensions are: length = 2.2 cm height = 1.7 cm width = 4.1 cm

    asked on February 20, 2013
  91. 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
  92. Pre-calc

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

    asked on October 6, 2017
  93. math

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

    asked on March 5, 2017
  94. ela

    What were obstacles that Mo'ne Davis had to overcome?

    asked on May 4, 2015
  95. Math

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

    asked on March 2, 2015
  96. Chemistry

    The separate suspended solid from a solution , we may use .......

    asked on April 20, 2014
  97. Chemistry

    In an experiment we have 4 liters of AlAin water in contain or A , and 2 liters of dubai water in contain out B . The alkalinity of water in container A and the alkalinity of water in container B are 50 and 150mg/l as caco3 ,,respectively the alkalinity of

    asked on April 20, 2014
  98. chemistry

    Calculate the amount of zirconium produced (in kg) if a reactor were charged with 261.0 kg ZrCl4 and 25.0 kg Na .

    asked on February 21, 2013
  99. 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
  100. math

    Let f be he real-valued function defined by f(x)=sin^3x+sin^3|x| (a) find f'(x) for x>0 (b) find f'(x) for x

    asked on November 4, 2010


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