# Edward

Most popular questions and responses by Edward
1. ## maths

an amount of Rs 5000 is put into three/investments at the rate of interest of 6%, 7%, 8% per annum respectively; the total annual income is Rs 35800. If the combined income from first two investments is Rs 70 more than the income from the third. Find

2. ## Chemistry

A buffer consists of 0.16 M KHCO3 and 0.39 M K2CO3. Carbonic acid is a diprotic acid with Ka1 = 4.5 10-7 and Ka2 = 4.7 10-11. (a) Which Ka value is more important to this buffer? Ka1 Ka2 I don't understand this one at all. How do I determine which Ka value

3. ## physics

A 2.0 m wire segment carrying a current of 0.60 A oriented parallel to a uniform magnetic field of 0.50 T experiences a force of what magnitude

4. ## physics

points A {at(2,3)m} and B {at(5,7)m} are in a region where the electric field is uniform and given by vector E=(4i+3j) N/C. What is the potential difference Va-Vb in volts? a. 23 b. 27 c. 30 d. 24 e. 11 i think the formula may be ds=dxi+dyi but even with

5. ## Math (Statistics)

How do I go about tackling this problem? The American Medical Association wishes to determine the percentage of obstetricians who are considering leaving the profession becaose of the rapidly increasing number of lawsuits against obstetricians. How large a

6. ## Chemistry-Stoichiometry

A 1.146g mixture of the solid salts NaS)4 and PB(NO3)2 forms an aqueous solution with the precipitation of PbSO4. How would I write the molecular form of the equation for the reaction?

7. ## mathematics

in triangle abc if acosA= bcosB then how to prove the triangle is isosceles or right angled

8. ## chemistry

A volume of 35.0 mL of nitrogen gas was collected over water at 24 degrees C and 99.1kPa. The vapor pressure of water at this temperature is 2.99 kPa. What is the pressure of the nitrogen gas alone?

9. ## Chemistry

Find the pH of a buffer that consists of 0.82 M methylamin (CH3NH2) and 0.71 M CH3NH3Cl (pKb of methylamine (CH3NH2) = 3.35.) I keep getting 3.41, but it says that it's wrong...

10. ## chemistry

Could you please tell me the objective, theory and mechanism,result, precautions and applications of following experiment : reaction of 4-aminotoluene and o-vanillin(preparation of azomethine)

11. ## Chemistry

An industrial chemist studying bleaching and sterilizing prepares several hypochlorite buffers. Find the pH of the following buffers. (a) 0.090 M HClO and 0.090 M NaClO (b) 0.090 M HClO and 0.135 M NaClO (c) 0.135 M HClO and 0.090 M NaClO (d) One liter of

12. ## physics

A 2100 car starts from rest at the top of a 5.0m long driveway that is sloped at 20 degrees with the horizontal. If an average friction force of 4000N impedes the motion find the speed of the car at the bottom of the driveway.

13. ## Math

What is the volume of a coffee can that is 6.5 inches high and has a diameter of 5 inches. round your answer to the nearest tenth.

14. ## physical science

If the earth had twice its present radius and twice its present mass, what would happen to your weight? Explain. What is the relationship between the radius (R) of orbit of a satellite and its period (T)?

15. ## Integers

At 11:00 pm the temperature was -9 degrees. By 7:00 am the temperature had risen 18 degrees. What was the temperature at 7:00 am.

16. ## physics

The figure below shows Superhero hanging motionless from a rope, with Trusty Sidekick hanging below him. Superhero's mass is 89.0 kg, while Trusty Sidekick's is 58.0kg, and the mass of the rope is negligible. (a) Find the tension in the rope at a point

17. ## Physics

A mixture of gasoline vapor and air is placed in an engine cylinder. The piston has an area of 7.4 x 10^-3 m^2 and is displaced inward by 7.2 x 10^-2 m. If 9.5 x 10^5 Pa of pressure is placed on the piston, how much work is done during this process? Is

18. ## Algebra

The cost of one hamburger and two large sodas is \$5.40. The cost of three hamburgers and one large soda is \$8.70. What is the cost of one hamburger?

19. ## math

Kate is saving to take an SAT Prep course that costs \$350 and saved \$180 and she adds \$17 to her savings each week. How many more weeks must she save to be able to afford the course? Need the answer right now!

20. ## mathematics

how many liters of water will have to be added to 1125 liters of 45% solution of acid so that the resulting mixture will contain more than 25% but less than 30% acid content.

21. ## integers

A submarine was at a depth of 225 meters below sea level. It rose 80 meters, then it dove 35 meters. How far below sea level was the submarine after ascending and descending.

22. ## chemistry

The following redox reaction occurs in basic aqueous solution. When balanced with the smallest whole number coefficients, what is the coefficient for OH-(aq)? Mn(OH)2(s) + MnO4-(aq) = MnO42-(aq). 1. ) 2 2. ) 3 3. ) 4 4. ) 6 5. ) 8 the answer i got was

23. ## physics-impulse

A tennis ball of mass m = 0.068kg and speed v = 21m/s strikes a wall at a 45∘ angle and rebounds with the same speed at 45 What is the magnitude of the impulse given to the ball?

24. ## Chemistry

How much heat is required to melt 75.5g of ice at -25 degrees Celcius, and convert it to steam at 105 Celcius

25. ## physics

I need help attacking this problem A steel ball is dropped onto a hard floor from a height of 1.95 m and rebounds to a height of 1.87 m (assume positive direction is upward) A. Caculate it's velocity just before it strikes the floor B. calculate it's

26. ## physics

A 80-kg man stands on a bathroom scale inside an elevator. (a) The elevator accelerates upward from rest at a rate of 1.40 m/s2 for 1.50 s. What does the scale read during this 1.50 s interval? N (b) The elevator continues upward at constant velocity for

27. ## physics

a gun is fired from a distance of 1.2 km from a hill.the echo of the sound is heard after 7.1 seconds at the same place. Calculate the velocity of sound.

28. ## maths

a matrix X has a+b rows and a+2 columns while the matrix Y has b+1 rows and a+3 columns. both matrices XY and YX exist. find a and b. can you say XY and YX sre of same type? are they equal?

29. ## Physics

I need help setting up this problem. While standing on the roof of a building, a child tosses a tennis ball with an initial speed of 15 m/s at an angle of 20° below the horizontal. The ball lands on the ground 2.8 s later. How tall is the building? Thank

30. ## physics

A mass M can slide with negligible friction inside a tube bent in a circle of radius R = 1.45 m. The tube rotates about its diameter; the mass is in equilibrium at ¦È = 47.3¡ã. Calculate the number of revolutions the hoop makes in 115 s.

31. ## Physics Repost

I need help setting up this problem. While standing on the roof of a building, a child tosses a tennis ball with an initial speed of 15 m/s at an angle of 20° below the horizontal. The ball lands on the ground 2.8 s later. How tall is the building? Thank

32. ## Chemistry

Calculate the pH of 0.215 M carbonic acid (H2CO3). (HINT: do NOT worry about the second H+ in this acid!) How would I solve this?

33. ## Mathematics

A bag contain 12 green balls,14 yellow balls and 4 red balls.what is the probability of selecting a red or green balls?

34. ## chemistry

What are the uses of azomethine?

35. ## Physics

Three particles A, B, C start from the origin from the same time, A with velocity a along x-axis, B with velocity b along y-axis, C with velocity c in xy plane along a line x=y. What should be the magnitude of c so that they always remain collinear is (a).

36. ## Data mining

2. AllElectronics caries 1000 products, P1, … P1000. Consider customers Ada, Bob, and Cathy such that Ada and Bob purchase three products in common, P1, P2, and P3. For the other 997 products, Ada and Bob independently purchase seven of them randomly.

37. ## Math

A swimming pool is 75 feet long, 45 feet wide, and 8 feet deep. It is filled to a depth of 5 feet. What is the volume of the pool?

38. ## Physics

I need help setting up this problem. While standing on the roof of a building, a child tosses a tennis ball with an initial speed of 15 m/s at an angle of 20° below the horizontal. The ball lands on the ground 2.8 s later. How tall is the building? Thank

39. ## physics

a stone is dropped from arising balloon at a height of 76m above the ground and reaches the ground in 6 seconds. Caculate the velocity of ballon when the stone was dropped?

40. ## math

HOMEOWNERS IN UNITED STATES USE MORE THAN 15 MILLION POUNDS OF PESTICIDES ON THEIR LAWNS EVERY YEAR. CONVERT THIS RATE TO OUNCES PER DAY ROUNDED TO THE NEAREST WHOLE NUMBER.

41. ## Algebra

The population of viruses in an influenza culture after t hours is given by the function x(t) = 4et/2.5 The cost y in dollars for a new automated microscope to count x viruses in a sample is y(x) = ln 2x Create the composite function that calculates the

42. ## Physics

I need help setting up this problem. A tennis player serves a tennis ball such that it is moving horizontally when it leaves the racquet. When the ball travels a horizontal distance of 19 m, it has dropped 58 cm from its original height when it left the

43. ## math

A street light is mounted at the top of a 19-ft-tall pole. A man 5.5 feet tall walks away from the pole with a speed of 14 ft/s along a straight path. How fast is the tip of his shadow moving when he is 100 feet from the pole?

44. ## Science

2. Contrast the metric units of distance, time, and speed. Describe the relationship between them.

45. ## Physics Repost

I need help setting up this problem. A tennis player serves a tennis ball such that it is moving horizontally when it leaves the racquet. When the ball travels a horizontal distance of 19 m, it has dropped 58 cm from its original height when it left the

46. ## maths

if the price of an orange was raised by 1/2k per orange, the number of oranges a customer can buy for #2.40 wil be less than 16.what is the price of an orange

47. ## mathematics

write the number of points of intersection of 2y=1 and y= sinx. -2pi

48. ## Physics

I need help setting up this problem. A tennis player serves a tennis ball such that it is moving horizontally when it leaves the racquet. When the ball travels a horizontal distance of 19 m, it has dropped 58 cm from its original height when it left the

49. ## Physics

A steel ball is dropped onto a hard floor from a height of 1.95 m and rebounds to a height of 1.87 m (assume positive direction is upward) A. Caculate it's velocity just before it strikes the floor B. calculate it's velocity just after it leaves the floor

50. ## mathematics

what is the domain and range of the function F(x)= 1/1-2cosx

51. ## Physical

A cubical block of wood of side 0.5 m floats in water. Given that the densities of wood and water are 800 and 1000 kg/m3 respectively Calculate the depth of the block immersed in water.

52. ## Michael

How many natural numbers are there with the property that they can be expressed as sum of cubes of two natural numbers in two different ways.

53. ## Physics

In which of the situations listed below is energy being transferred as heat to the system in order for the system to do work? In which situation is work being done on the system in order for energy to be transferred from the system as heat? a. Two sticks

54. ## english

What does the speaker in “Remembrance” plan to do? a. Forget her beloved. b. Live in mourning forever. c. Find a new love. d. Go on with her life.

55. ## Physics

A steel ball is dropped onto a hard floor from a height of 1.95 m and rebounds to a height of 1.87 m (assume positive direction is upward) A. Caculate it's velocity just before it strikes the floor B. calculate it's velocity just after it leaves the floor

56. ## physics

A circular coil of 30 turns and radius 7 cm is placed with its plane oriented at 90 degrees to a magnetic field of 0.1 T. the fieldis now increased at a steady rate, reaching a value of 0.7 T after 5 seconds. when emf is induced in the coil

57. ## integral calculus

integrate. (1):sin2xcos3x (2):5(cos3x)^2

58. ## Maths

Y is partly constant and partly varies as x...if y=2 x=4 and when y=5 x=8....find y when x=9

60. ## Integers

Suppose Frontier City Amusement Park bought a ferris wheel for \$92,000. 42,512 people paid \$2.00 each to ride the ferris wheel the first year. Ignoring the cost of operating how much money did the park lose on the ferris wheel it first year.

61. ## physics

The planet mars has a mass of 6042e23 kg and a radius of 3038e6 m. how much would a 60 kg person weigh on Mars compared to their weight on Earth? How heavy he would feel he weighed in kg on Mars?

62. ## S.S

About how far east and west goes Georgia extend

63. ## maths

calculate the total surface area of a solid cone of slant height 10cm. use the value 3.14 for radius

64. ## physics

A 20 g bullet moving horizontally with a speed v hits a 2-kg block of wood resting on a table. After hitting the block the bullet is embedded in the block of wood and the block and the bullet moves a distance of 40 cm before it stops. If the coefficient of

65. ## maths

A shop is sending out a bill for an amount less than #100.the accountant interchange the two digits and so overcharage the customer by #45,given that the sum of the two digits is 9.find how much the bill should be?.thanks

66. ## math

It is a 4-digit number The tens are double the ones. The thousands are double the tens. The sum of the digits is 19. What number is it?

67. ## science

methanol gas decomposes into carbon dioxide and hydrogen gas. At 327 degrees celcius, the equilibrium concentration are methanol is 0.15M, and hydrogen is 1.1M for the reaction calculate the Kp at this temperature.

68. ## marhs

A wheel is free to rotate about its fixed axle. A spring with constant k = 290 N/m is attached to one of its spokes a distance r = 23 cm from the axle, as shown in the figure. (a) Assuming that the wheel is a hoop of mass m = 490 g and radius R = 0.97 m,

69. ## physics

a brass rod is 2 m long at a certain temperature. what is its length for a temperature rise of 100 K, if the expansivity of brass is 18 *10^-6K-1?

70. ## Maths

qustion(1):find the product of xy if x,3/2,6/7,y are in a g.p qustion(2):calculate the angle between the vector u=2i+2j and v=2i+2ji qustion(3):if the center of a circle,the tangent from X touches A&B and AC is a diameter if AOB=47 calculateBOC

71. ## physics

A force of 80.0 N is required to pull a 25.0 kg wooden toy boat at a constant velocity across a smooth glass surface on Earth. What force would be required to pull the same wooden toy boat across the same glass surface on the planet Jupiter?

72. ## chemistry

The reaction between 0.0272 g of Mg with an excess of water was carried out in an ice calorimeter. The volume of water decreased by 0.19 mL during the reaction. a) Write the equation that occurs. Is it a redox? b) Calculate the enthalpy of reaction? i have

73. ## algebra

Write the expression as a sum​ and/or difference of logarithms. Express powers as factors. log3(27x)

74. ## I need checking

Whats the 2nd derivative of 4xsecx I got 4secxtanx+8xsecxtan^2x

75. ## physics

A child in a boat throws a 5.15-kg package out horizontally with a speed of 10.0 m/s. The mass of the child is 24.2kg and the mass of the boat is 33.2kg . Calculate the velocity of the boat immediately after, assuming it was initially at rest.

76. ## Statistics

A set of telephone lines is to be installed so as to connect between town A and town B. The town A has 2000 telephones. If each of the telephone users of A were to be guaranteed instant access to make calls to B, 2000 telephone lines would be needed. This

77. ## Maths

Solve this equation fo rx in the interval 0

78. ## physics

sound waves travel faster in humidity than in dry air. But as temperature increases the velocity of sound also increases. So sound travels faaster in hot day than in winter. But during winter there is also presence of humidity in fog. Why doesn't sound

79. ## science

In 91% (by volume) isopropyl alcohol (a large [compared to water], flammable molecule) solution, there are only two substances: the alcohol, and water. So when I poured 50 mL of 91% isopropyl alcohol into a graduated cylinder, how many milliliters were

80. ## physics

if a 5microfarad capacitor is charged by a 20volts battery and it is then connected across an uncharged 20microfarad capacitor , find the potential energy

81. ## Science

Engineering Science Project ideas and some thing cool interesting and new not that has been popular as a science project!!!!!!!!!!!!! Plz!!!!!!!!!!!!!!

82. ## MATH

Solve the simultenous equation. XY=160 LogX - 3LogY=1

83. ## algebra

A circle has the equation x squared plus y squared plus 8 x minus 8 y minus 49 equals 0 Graph the circle using the center (h,k) and radius r. Find the intercepts, if any, of the graph. qaz

84. ## maths

if the radius of a sphere decreases by 0.1%,find the percentage decreases in (i)surface area (ii)volume

85. ## math

Todd run 8 laps around a 400-meter track on Monday, 4 laps on Tuesday, 8 laps on Wednesday, 4 laps on Thursday, and 8 laps on Friday. How many kilometers did he run?

86. ## Thinking Mathematically

solve A Flag Pole Has A Height Of 16 Yards. It Will Be Supported By Three Cables, Each Of Which Is Attached To The Flagpole At A Point 4 Yards Below The Top Of The Pole And Attached To The Ground At A Pole. Find the total number of feet of cable that will

87. ## physics

a gun is fired from a distance of 1:2 km from a hill. The echo of sound is heard after 7:1seconds at same place. Calculate the velocity of bullet fired.

88. ## Math

As the candle burns,its length decreases at a rate of 2cm every 20minutes. Write down the equation to calculate the length of the candle

89. ## algebra

Find the midpoint of the line segment joining the points P1 and P2 P1= (5,2) P2= (-4,3) The midpoint is _______ (Type an ordered pair. Use integers or simplified fractions for any numbers in the expression.) qaz

90. ## maths

prove that 4cos36+cot15/2=1+4+9+16+25+36,ifcot15/2 is1+cos15/+sin15

91. ## maths

a circular ink-blot grows at a rate of 2 sq cm per second. find the rate at which the radius is increasing after (28/11)seconds.

92. ## Physics

A 10 kg block is pushed across a rough surface by a 25N force the block moves at a constant velocity when this force is applied. A) determine the magnitude of the friction force acting on the block B) What is the coefficient of friction between the surface

93. ## Physics

A 1200 kg car accelerates to the right at 7m/s2 along a special frictionless track. Determine the magnitude and direction of the force the engine exerts to accelerate the car? A wind blows heavy winds into the car's path.As a result the car's acceleration

94. ## physics

Advertisements for A toy balk once stated that it would rebound to a height greater than the hethe height from which it was dropped. Is this possible?

95. ## algebra

Find the equation of a line that is parallel to the line y = −3x and contains the points (9,−4). Y=______ (Type your answer in slope-intercept form.) qaz

96. ## algebra

Find the equation of a line that is perpendicular to the line y = 1/4x + 5 and contains the point (-6, 0) Y=________ (Type your answer in slope-intercept form.) qaz

97. ## algebra

Find the intercepts and use them to graph the equation. Y = x-7 qaz

98. ## physics

a ball rolling on oa inclined plane dors so with constant acceleration. One ball, A, is released from rest on th etop of an inclined plane 18m long to reach the bottom 3s later. At the same time as A is released, another ball, B, is projected up the same

99. ## physics

a bus is driving through traffic as it makes a number of express stops. the bus drives at a speed of 10 m/s2 for 90 seconds then drives at a speed of 15m/s for 120 seconds before stopping for 30 seconds, then drives at a speed of 5m/s for 60 seconds before