# Mariam

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

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?

3. ## home economics

Explain 5 subjects that are related to home economics

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)

5. ## Math

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

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

7. ## math

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

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.

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

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?

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

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?

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.

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

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?

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?

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,

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

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

20. ## Chemistry

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

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.

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.

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,

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

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 ..

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.

27. ## Chemistry

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

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°

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

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

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?

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

33. ## Physics

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

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 .

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?

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)

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?

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.

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?

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.

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

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

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

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=?

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

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

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?

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

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?

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.

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

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?

53. ## Math homework

A boy spends 2/7 - 1/5

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

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 ?

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]

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

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

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

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?

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

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?

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

64. ## Chemistry

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

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

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

67. ## maths

Simplify 9asquare_ msquare divided by msquare _2am_3asquare

68. ## Physics

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

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

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.

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

72. ## Math

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

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

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?

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.

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

77. ## Pre-Calculus

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

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

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

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

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.

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

83. ## Ela

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

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...

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

86. ## earth science

The active sections that are located along fault lines are called

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?

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

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?

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

91. ## Pre-Calculus

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

92. ## Pre-calc

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

93. ## math

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

94. ## ela

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

95. ## Math

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

96. ## Chemistry

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

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

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 .

99. ## physics

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