Sami

Most popular questions and responses by Sami
1. PHYSICS HELP!!!!!!!

You walk 50 m to the north, then turn 60° to your right and walk another 45 m. How far are you from where you originally started?

2. Chemistry

When an electric current passes through water during the process of electrolysis, two gases are formed. One gas has a boiling point of -183 C and the other has a boiling point of -253 C. Has a physical change or chemical change occurred? Explain. I think

3. Science

What does Asimov predict will happen to earth in billions of years? a. it will be burned up by the sun b. its population will increase*** c. it will shrink slightly in size d. it will change position in the galaxy Am I correct?

4. physics

Three identical uniform meter sticks are placed on the floor. The first stick lies along the y axis from y = 0.320 m to y = 1.32 m. The second stick lies along the x axis from x = 0.330 m to x = 1.33 m. The third stick is positioned so that one end is on

What other information must be given in order to be able to prove the two triangles congruent by ASA? i.imgsafe(.)org/c64c59dad9.jpg 1. T=S 2. P=S 3. P=R

6. Geometry (Please check my work)

A segment has endpoints M(6,15) and N(-3,9). The image of the segmen for a dilation with center (0,0), has endpoints M'(2,5)and N (-1,3). What is the scale factor of dilation? A. 2

7. English

Which of the following is not an object of satire in "a contribution to the statistics'? A. The self importance of social studies B. The corruption of the powerful C. Thee pride of mankind D. The delusions of common people

8. Math

Two 6-sided dice are rolled at the same time. How many outcomes correspond to the event that the sum of the numbers is 5?

9. chemistry

How would your calculated %P2O5 value be affected if you had not used this blank solution

10. physics

A person is sitting with one leg outstretched, so that it makes an angle of = 39.9o with the horizontal. The weight of the leg below the knee is 34.7 N with the center of gravity located below the knee joint. The leg is being held in this position because

11. Georgia History

1. Which of the following describes the Puritans? A) didn't have much success as planters B) made Sunbury into a thriving port*** C) came from the backcountry of Virginia D) came from Pennsylvania by way of North Carolina 2. Georgia’s slave code was

12. Chem help

I have the answers for these but can you please explain to me how to get them? Thanks. Place the following in order of decreasing lattice energy. KBr RbI MgS a. KBr > RbI > MgS b. KBr > MgS > RbI c. RbI > KBr > MgS d. MgS > KBr > RbI e. MgS > RbI > KBr I

13. Physics

A 60kg man standing on a stationary 40kg boat throws a 0.2kg ball with a velocity of m/s. Assuming there is no friction between the man and the boat, what is the speed of the boat after the man throws the ball?

14. math

How do I convert 35.2 ft^2 to cm^2 using dimensional analysis? ie, what are the steps when you have units squared?

15. Math

I have a triangle with equal sides. Then a s cons triangle is put in the middle so I have four triangles. Triangles are continued to be put instead so I have more and more triangles. As more triangles are added in the same space, the size of them are

16. physics

A positive charge of 0.0001258 C experiences a force of 0.3 N when located at a certain point. What is the electric field magnitude at that point? Answer in units of N/C.

17. Geometry (Please check my work)

Find the image of O (-2,-1) after two reflections, first across the line y=-5, and then across the line x=1. I believe the answer should be (-1,-6) Can someone please confirm?

18. Math

Point Y (-1,-3) is rotated 180° about the origin. What are the coordinates of it's image, point Y'. I keep getting (-1,-3) but that's not a choice. I'm not sure what I'm doing wrong, can someone help? These are the choices listed (-3,-1) (-3,1) (1,3)

19. Algebra 1

Identify the initial amount a and the growth factor b in the exponential function. f(t)=1.4^t A)a = 1, b = 0.4 B)a = 1.4, b = 0 C)a = 1.4, b = t D)a = 1, b = 1.4*** Is this correct? If I'm wrong can you please explain why, thanks! (=

20. physics

An arrow is shot from a bow at 20.0 m/s at an angle of 65 degrees above the horizontal. The arrow leaves the bow at a height of 1.80 m. At what height will it strike a wall that is 10.0 m away? (Remember to connect the two motions of the arrow using time.)

21. History

What is the main reason some people believe there should not be any limits on presidential terms? A. There should be a monarch instead of a president. B. The people should decide how long a president can serve in a democracy.

22. math

Write the equation of a line that goes through (5,3) and (2,7) I found the slope of the line to be -4/3 Then, I substituted one of the points in for x and y to be: y = -4/3x + b 3 = -4/3(5) + b 3 = -20/3 + b 3 + 20/3 = b This is where I am stuck == do I

23. math

You roll a number cube twice. Find the probability of the event in fraction form. -Rolling a 4 then an even number -Rolling a 3 then a 3 -Rolling a number less than 1 and then a number less than 2

24. physics

A uniform disk with a mass of 27.3 kg and a radius of 0.309 m is free to rotate about a frictionless axle. Forces of 90.0 N and 125 N are applied to the disk, as the drawing indicates. (b) What is the angular acceleration of the disk?

25. physics

Find the net torque (magnitude and direction) produced by the forces F1 (F1 = 17.3 N) and F2 (F2 = 26.1 N) about the rotational axis shown in the drawing. The forces are acting on a thin rigid rod, and the axis is perpendicular to the page. (x = 0.323 m, y

26. physics

Find the net torque (magnitude and direction) produced by the forces F1 (F1 = 17.3 N) and F2 (F2 = 26.1 N) about the rotational axis shown in the drawing. The forces are acting on a thin rigid rod, and the axis is perpendicular to the page. (x = 0.323 m, y

27. Physics

When you take a bath, how many kilograms of hot water (50°C) must you mix with cold water (13°C) so that the temperature of the bath is 36°C? The total mass of water (hot plus cold) is 215kg. Ignore any heat flow between the water and its external

28. Physics

In the process of changing a flat tire , a motorist uses a hydraulic jack. She begins applying a force of F1=8.6N to the input piston. As a result, the output plunger applies a force of F2=305N to the car. The height difference between the input piston and

29. physics

A car moving with an initial speed v collides with a second stationary car that is 46.0 percent as massive. After the collision the first car moves in the same direction as before with a speed that is 37.7 percent of the original speed. Calculate the final

30. Math

Hooke's Law states that the distance a spring will stretch beyond its natural length varies directly with the force applied to the spring. A force of 12 pounds is needed to stretch a certain spring 9 inches beyond its natural length. Find a formula that

31. Maths Income Tax

1) A man with an income of \$7500 and allowance of \$1800, paid \$1824 in tax. What is the rate of taxation? 2) Mr Green earns \$95 per week and has allowances of \$ 2450. Mrs Patel earns \$19400 per annum and has allowances of \$3680. They both pay all their tax

32. History

Which of the following is important when a primary scheduled as heavily front-loaded as it was in 2008? A. A clear stance on the issues B. The ability to raise money C. A comprehensive general election strategy D. A steady, slow building following with the

33. physics

Find the distance between the two electrons. The value of the Coulomb constant is 8.98755 × 109 N · m2 /C 2 and the acceleration of gravity is 9.81 m/s 2 . 1. 0.507424 m 2. 50.7424 m 3. 5.07424 km 4. 5.07424 m 5. 5.07424 cm can anybody help me please

34. Pre-calculus

Hooke's Law states that the distance a spring will stretch beyond its natural length varies directly with the force applied to the spring. A force of 12 pounds is needed to stretch a certain spring 9 inches beyond its natural length. Find a formula that

35. physics

How much positive charge is in 0.8 kg of neon? The atomic weight (20.1797 g) of neon contains Avogadro’s number of atoms, with each atom having 10 protons and 10 electrons. The elemental charge is 1.602 × 10−19 C and Avogadro’s number is 6.023 ×

36. physics

A uniform disk with a mass of 27.3 kg and a radius of 0.309 m is free to rotate about a frictionless axle. Forces of 90.0 N and 125 N are applied to the disk, as the drawing indicates. (a) What is the net torque produced by the two forces? (b) What is the

37. science

Which family/group does the element neon belong to.

38. PHYSICS ARGENT!!!

Determine the scalar product of A= 3.0i + 1.0j - 2.0k and B= 3.0i - 2.0j - 3.0k

39. Physics

A solid object floats on ethyl alcohol, with 60.9% of the object's volume submerged. Find the density of the object.

40. physics

A positive point charge = 2.1×10−5 is fixed at the origin of coordinates, and a negative point charge = −5.4×10−6 is fixed to the axis at . abeer abdullah Part A Find the location of the place along the axis where the electric field due to these

41. science

I cannot figure out how to convert 35 atm to degrees fahrenheit. Could you help me please?

42. physics

Three point charges, two positive and one negative, each having a magnitude of 30 µC are placed at the vertices of an equilateral triangle (43 cm on a side). What is the magnitude of the electrostatic force on one of the positive charges? The value of the

43. Maths proportions

1) Nine milk bottles contain 4.5 litres of milk between them.How much do five bottles hold? 2) A shopkeeper can buy 36 toys for \$20.52. What will he pay for 120 toys? 3) Three men can build a wall in 10 hours. How many men would be needed to build the wall

44. physics

Suppose you need to measure the mass of an object, but have only a 7-kg standard mass and a meter stick. Place a knife edge under the 50-cm mark of the meter stick. Then put the 7-kg standard mass at the 39.1-cm mark and place the object so as to balance

45. math

I'm working on a problem where I was given a table and had to find the exponential equation of best fit. The table is about the number of views of videos. The equation is y = 12.0143(1.7498)^x I had to estimate the number of views after 2 weeks and that is

46. Math

If I roll a die 6 times, how many 5's do I expect to get? I know if I rolled it one time I would have a 1 in 6 chance of getting a 5, but how do I determine how many I would expect to get if I roll it 6 times?

47. physics

A staging that weighs W staging supports a painter weighing 770 N. The reading on the left scale is 660 N and the reading on the right scale is 410 N. What is the weight of the staging? Answer in units of N

48. Chem Urgency

Can you explain what the pseudo-gas configuration is? I have the definition but I still don't understand. I have the example.. Sn([Kr] 5s24d105p2) Sn4+ ([Kr]4d10)+4e- I understand the first part but I don't understand the second.

I know how to write elctron configurations but I am having problems with electron config. of main group ions. Problem: Using condensed electron configurations, write reactions for the formation of the common ions of the following element: Iodine (Z=53)

50. Math

Another question I'm a bit confused on.. What is the angle of the rotation about C the maps the solid figure to the dashed figured? tinypic(.)com/r/2utnvoo/9 Choices: 90°

51. physics

An electric field of magnitude 3640 N/C is applied along the x axis. Calculate the electric flux through a rectangular plane 0.166 m wide and 0.72 m long if the plane is parallel to the yz plane. Answer in units of N · m2 /C. 435.05 N. m2/C 002 (part 2 of

52. need help with thsi equation

ZnSO4.xH2O(s) ---> ZnSO4(s)+xH2O(g)

53. Physics

Two small pith balls, each of mass m = 16.6 g, are suspended from the ceiling of the physics lab by 1.8 m long fine strings and are not moving. If the angle which each string makes with the vertical is è = 19°, and the charges on the two balls are equal,

54. Social Studies

Could the greeks have developed a democracy without the development of a Aristocracy?

55. Math

So my teacher marked this 0/6 but only told me to correct 2 things. Can some one check over this? If I'm right I need to email my teacher.. Complete the two column proof. Given:

56. physics

Alice has a mass of 70.0 kg and her car has a mass of 1000.0 kg. Alice is sitting in parked car on the side of the road. The magnitude of the normal force exerted by the road on her car is? (use g = 9.81 m/s2)

57. Maths-Proportions

1) An aircraft flying at 500 km/h completes a journey in 8.4 h. How long would the journey take if it flew at a speed of 420 km/h? 2) Jackie can drive to work in 18 mins if he travels at an average speed of 35 m.p.h. How long will the journey take if she

58. Physics

Calculate the distance (in ) that Larry runs if he maintains an average speed of 8.9 for 1 hour.

59. Physics

The membrane that surrounds a certain type of living cell has a surface area of 2.13 x 10-9 m2 and a thickness of 1.94 x 10-8 m. Assume that the membrane behaves like a parallel plate capacitor and has a dielectric constant of 6.4. (a) If the potential on

60. physics

The temperature of 2.7 moles of an ideal gas is 471 K. How much work does the gas do in expanding isothermally to 3.7 times its initial volume?

61. Stats

An auditor reviewed 25 oral surgery insurance claims from a particular surgical office, determining that the mean out-of-pocket patient billing above the reimbursed amount was \$275.66 with a standard deviation of \$78.11. (a) At the 5 percent level of

62. Social Studies

Could the greeks have developed a democracy without the development of a Aristocracy? And y??

63. Math

Find the HCF of f(x) = 6x^3 + 24x^2 + 18x, g(x) = 4x^4 + 4x^3 - 24x^2

64. Math

how do you evaluate these numbers? /-48/-/-20/ -/-51/ I have looked every where and I need help please.

65. math

you want to make an open-topped box from a 20 cm by 20 cm piece of cardboard by cutting out equal squares from the corners and folding up the flaps to make the sides. what are the dimensions of each square, to the nearest hundredth of a cm, so that the

66. math

I'm having trouble determining when you divide and when you multiply to solve a scientific notation problem. For example: Assume that there are 20,000 runners in the New York City marathon. Each runner runs a distance of 26 miles. If you add together the

67. economics

A firm's total cost is Tc=40+100Q-420Q^2+30Q^3. Find the unit of production at which average variable cost at minimum.

68. biology

In a cross between a white-eyed female fruit fly and red-eyed male, what percent of the female offspring will have white eyes? (White eyes are X-linked, recessive)

69. esl

change the underlined nouns to pronouns. We well give it to our childern.

70. chemistry

A gas has a mass compostion of 20.8% nitrogen, 25.8% oxygen, 28.4% carbon dioxide and 25 % hydrogen. Determine its average molecular weight.

71. math

samantha has 28 and she gets 28 more how many would she have in all.

72. physics

A ball of radius 0.2m rolls along a horizontal table top with a constant linear speed of 3.04 m/s. The ball rolls off the edge and falls a vertical distance of 2.02m before hitting the floor. What is the angular displacement of the ball while it is in the

73. Algebra

find the x and y intercepts: 3x - 2y = -12 i know for the x intercept, put y=0 in the equation,s olve for x. For the y intercept, do the reverse. But i still don't understand how to solve it. Its just majorly fustrating me. And i can't go to school and ask

74. algebra

Find the x and y intercepts: 3x - 2y = -12 i know the anwser is (2 , -3) but how do i show the work that i found that anwser?

75. Algebra

Name the property used in the equation 15n=15 multiplicative identity or multiplicative inverse?

76. math

One more: The LCM of f(x) = 4(x - 1)^2 (x^2 + 6x + 5) and g(x) = 10(x - 1) (x + 2) * (x^2 + 7x + 10) is ...

77. math

The LCM of f(x) = 20(x - 1)^3 (x + 2)^2, g(x) = 250(x - 1)^2 (x + 2) is _______... i'm not sure how to do this at all...

78. biology

why do biologists use a classification system to study the diversity of life

79. ecology

what is the word for the definition stress that puches a mass of rock in two opposite directions?? please help!

80. chemistry

A 9.35 gram of ring with it's volume of 0.654 cm3 is an alloy of gold and with density of gold and silver respectively 19.3 g/cm3 and 10.5 g/cm3 assume there is no change in volume when pure metals are mixed. The volume of gold is?

81. Algebra 1

Simplify the difference (-7p^4+4p^3+6)-(3p^3-5p+3) I removed the parenthesis and changed the addition and subtraction signs to their opposites on the second set; -7p^4 + 4p^3 + 6 - 3p^3 + 5p - 3. When I combined the like terms, I was able to simplify the

82. Language Arts

Which of the following correctly revises the the sentence so that it is entirely in the active voice? A. It has been decided by the school that the regular teacher should not evaluate the class; instead, the assessment should be performed by a visiting

83. biology

Could a man with type B blood and a woman with type AB blood produce a child with type O blood? Explain

84. physics

an inclined plane, which slopes at 37degree is used to raise a 10 kg object to a heghit of 4m if the efficency is 80% determine a,the load (t@ke sin 37=0.6,cos 37 =0.8) b,the cofficent of kinetic friction c,the effort force

85. Math

The espionage is use only an associative property to rewrite the expression: (mq) * n My teacher says the correct answer is m * (qn) but could the answer also be (nm) * q or m * (mq) or q * (mn)?

86. Geometry

I'm a little confused about what a Pythagorean Triple is. As long as your two legs are both whole numbers, isn't every one a triple?

87. Math

I just want to make sure I have done this correctly. (10a^3b)(3ab^2c^2) = 30a^4b^3c^2

88. Math

I have the following chart that I am supposed to find the percent increase in one step. The directions specifically say not to use a two step method. 10.5 12.5 14.9 17.7 21.1 25.1 So I divide 12.5 by 10.5, 14.9 by 12.5, etc. When I do this (and round) I

89. Math

Does linear growth have to add the exact same amount, so a constant amount each time such as 500, 500, 500, etc, or does it just have to be close, such as 125, 137, 145, 160, etc?

90. math

Does linear growth have to add the exact same amount, so a constant amount, each time or does it just have to be close?

91. Math

I have the following chart that I am supposed to find the percent increase in one step, not using a two step method. 10.5 12.5 14.9 17.7 21.1 25.1 When I do this (and round) I get about 19% increase for each one. (we are supposed to round. Then I have

92. chemistry

a 2.00g sample of zinc metal is added to a calorimeter containing 150g of nitric acid solution initially at 20.0 degrees celsius . The temperature of the solution increased to 28.0 degrees celsius . Calculate the delta H of the reaction assuming that the

93. medical coding

A patient is admitted to the hospital for chest pains due to tachycardia. While in the hospital, the patient was also treated for type 1 diabetes. Upon further review, the coder noted that the documentation and ekg didn, t provide further evidence of the

94. Intergration: Measurement (Math)

I don't get it. I need to find out these conversions. 15,000 g= ____ kg 5,000 mL= ____ L 75 mL= ____ L 390 mL= ____ L 0.03 m= ____ mm 6 m= _____ mm 2.48 L= ______ mL 43.2 L= ______ mL 807 mL= _____ L 3,751 m= _____ km

95. math

how many feet in a dozen

96. Physics

Review Conceptual Example 11 before attempting this problem. An empty capacitor is connected to a 9V battery and charged up. The capacitor is then disconnected from the battery, and a slab of dielectric material (k=3)is inserted between the plates. (a)

97. math

find equivalent fractions with a common denominator and order from least to greatest 3/7 ,1/9 ,2/3

What is a parent function?

99. math question

Four race car drivers participate in a race on a loop track. All four are going at a constant speed. Assume that they did a ying start. That is, all four crossed the start line at the same instant while each was going their constant speed. Then they