# Edwin

Most popular questions and responses by Edwin
1. ## math

Mrs. Morton has a special reward system for her class. When all her students behave well, she rewards them by putting 333 marbles into a marble jar. When the jar has 100100100 marbles or more, the class has a party. Right now, the jar contains 242424

2. ## physics

A car with a mass of 1.1 × 103 kilograms hits a stationary truck with a mass of 2.3 × 103 kilograms from the rear end. The initial velocity of the car is +22.0 meters/second. After the collision the velocity of the car is -11.0 meters/second. What is the

3. ## physics

A light rigid bar is suspended horizontally from two vertical wires, one of steel and one of brass. Each wire is 2.00m long. The diameter of the steel wire is 0.60mm and the length of the bar AB is 0.20m. When a mass of 10.0kg is suspended from the centre

4. ## Physics

A shopper in a supermarket pushes a cart with a force of 35 N directed at an angle of 52(angle sign here) downward from the horizontal. Find the work done by the shopper on the cart as the shopper moves along a 50.0 m length of aisle. Someone tell me if

5. ## History

Why did China’s economy succeed when the Soviet economy failed in the 1980s? A) China became more economically isolated and self-sufficient, rejecting membership in trade organizations. B) China implemented market-driven economic reforms while

6. ## College Physics

A 1200-kg car going 30 m/s applies its brakes and skids to rest. If the friction force between the sliding tires and the pavement is 6000 N, how far does the car skid before coming to rest? Can you help me get the formula to use . Thanks

7. ## physics

A ball is dropped from a height of 20m and rebounds with a velocity which is 3/4 of the velocity with which it hit the ground. What is the time interval between the first and second bounces?

8. ## physics

A small piece of cork in a ripple tank oscillates up and down as ripples pass it. If the ripples travel at 0.20m/s, have a wavelength of 15mm and an amplitude of 5.0mm, what is the maximum velocity of the cork?

9. ## physics

An open tank holds water 1.25 m deep. If a small hole of cross section area 3cm^2 is made at the bottom of the tank, calculate the mass of water per second initially flowing out of the hole. (g=10m/s^2, density of water= 1000 kgm^-3)

10. ## Math

A tree and a flag pole are on the same horizontal ground, A bird on top of the tree observes the top and bottom of this flag pole below it at angle 45 degrees and 60 degrees respectively, If the tree is 10.65 meters high ,calculate and correct to 3

11. ## physics

A light rigid bar is suspended horizontally from two vertical wires, one of steel and one of brass. Each wire is 2.00m long. The diameter of the steel wire is 0.60mm and the length of the bar AB is 0.20m. When a mass of 10.0kg is suspended from the centre

12. ## physics

water flows along a horizontal pipe of cross-sectional area 48cm^2 which has a constriction of cross-sectional area 12cm^2 at one place. If the speed of the water at the constriction is 4 m/s, calculate the speed in the wider section. The pressure in the

13. ## physics

A flywheel of moment of inertia 0.32 kgm^2 is rotated steadily at 120rad/s by a 50 W electric motor. (i)find the kinetic energy and angular momentum of the flywheel. (ii) calculate the value of frictional couple opposing the rotation. (iii)find the time

14. ## physics

water flows along a horizontal pipe of cross-sectional area 48cm^2 which has a constriction of cross-sectional area 12cm^2 at one place. If the speed of the water at the constriction is 4 m/s, calculate the speed in the wider section. The pressure in the

15. ## physics

A progressive and a stationary simple harmonic wave each have the same frequency of 250Hz and the same velocity of 30m/s. Calculate (i) the phase difference between two vibrating points on the progressive wave which are 10cm apart. (ii) the distance

16. ## physics

a 1200 kg car going 30 m/s applies its brakes and skids to rest. if the friction force between the sliding ires and the pavement is 6000 N, how far does the car skid before coming to rest. I know the ans is 90 m what work/energy formula should i use to get

According to the Uniform Partnership Act, the three key elements of any general partnership are

18. ## investment accounting

You have been hired as a financial consultant to defense electronics,Inc.

19. ## physics

A special prototype model aeroplane of mass 400g has a control wire 8cm long attached to its body. The other end of the control line is attached to a fixed point. When the aeroplane flies with its wings horizontal in a horizontal circle, making one

20. ## physics

A plane progressive wave is represented by the equation: y= 0.1sin(200pi(t)-20pi(x/17) where y is the displacement in millimetres, t is in seconds and x is the distance from a fixed origin O in metres. Find (i) the frequency of the wave, (ii) its

21. ## AP Chemistry

A saturated solution of CaF2 (of MW 78.0 g/mol) contains 0.0167 grams per liter. What is the solubility product constant of CaF2?

22. ## Physics

A brass rod is 2.0 metres long at a certain temperature. What is its length for a temperature rise of 100 kilogram if the linear expansivity of brass is 10/10^5k^1?

23. ## physics

A special prototype model aeroplane of mass 400g has a control wire 8cm long attached to its body. The other end of the control line is attached to a fixed point. When the aeroplane flies with its wings horizontal in a horizontal circle, making one

24. ## physics

A flywheel with an axle 1.0cm in diameter is mounted in frictionless bearings and set in motion by applying a steady tension of 2N to a thin thread wound tightly round the axle. The moment of inertia of the system about its axis of rotation is 5.0 x 10^-4

25. ## chemistry

1. Identify the strongest intermolecular forces present in each of the following: CH3CH2CH3 C6H5NH2 HF SO2 CH3CH2OH NF3 CH3Cl

26. ## maria vazquez

Sonoma winery has fixed cost of \$10,000 per year. its warehouse sells wine with variable costs of 80% of its unit selling price. How much in sales does Sonoma need to break even per year?

27. ## physics

Three charges of 5 x 10^(-6) C are placed on the vertices of an equilateral triangle of 10cm. Calculate force on each charge.

Many organizations find themselves in the apparently contradictory position of having high levels of financial investment in inventory, but at the same time frequently running out of stock of important components and materials. (a) explain how this

29. ## Physics (Checking answe)

Sorry for re-posting but I need to know if I did it right, please help, I worked out the problem I just want to know if I did it right. A shopper in a supermarket pushes a cart with a force of 35 N directed at an angle of 52(angle sign here) downward from

30. ## MATH

WRITE A SIMPLE BUT A COMPLETE FORTRAN PROGRAM TO CALCULATE THE AREA OF A TRIANGLE

31. ## MATH

WRITE A SIMPLE BUT A COMPLETE FORTRAN PROGRAM TO COMPUTE THE AVERAGE OF SIX NUMBERS AND DISPLAY THE NUMBERS, SUM AND AVVERAGE. THE PROGRAM SHOULD TERMINATE WHEN ZERO IS ENTERED AS A NUMBER. THE PROGRAM SHOULD BE EDUCATIVE

32. ## physics

A 24V battery of internal resistance of 10ohms is connected to a variable resistor. At what value of current drawn from battery the rate of heat produced by the resistor is maximum? Hence find its value.

33. ## Chemistry

A solution of NaOH(aq) contains 7.7 grams of NaOH in 93 mL of solution. Calculate the pH at 25◦C. ---- 7.7 grams x (1 mol/39.997 grams) = 0.19 mol 0.19 mol/0.093 L = 2.07 M pOH = -log(2.07) = -0.316 ---- Am I doing anything wrong? Why am I getting a

34. ## physics

A bird of mass 0.8kg hovers upwards by beating the mass of effective area 0.5m^2. (i) what is its upthrust? (ii) estimate the velocity imparted to the air by beating of the wings assuming the density of air at STP to be 1.3kg/m^3.

35. ## English

How would I revise this sentence to eliminate unnecessary shifts in tense, mood, voice, or person? The freezing weather is threatening crops such as citrus fruits which were sensitive to cold. The freezing weather threatened the crops, which were sensitive

36. ## physics

a fluid flows through a horizontal pipe of varying cross-section. Assuming the flow is streamline and applying the bernoulli equation, show that pressure in the pipe is greatest where cross-sectional area is greatest.

37. ## physics

The static pressure in a horizontal pipeline is 4.3 x 10^4 Pa, the total pressure is 4.7 x 10^4 Pa, and the area of cross-section is 20cm^2. The fluid may be considered to be incompressible and non-viscous and has a density of 10^3 kg/m^3. Calculate (i)

38. ## math

use the clues to find the 7th digit mystery number. * it is between 7 and 8 million * it contains all of the digits greater than 1 and less than 8 * the hundred thousands digit is 3 * the ten thousands digit and the thousand digits are the same * the tens

39. ## Bio

without oxygen cellular respiration grinds to a standstill although glycolysis can continue to make some atp anaerobically for a short time explain why the oxidative phosphorylation stops why does the citric acid cycle stop

40. ## physics

If the amplitudes of the two waves are 3 units and 1 unit respectively, show by the principle of superposition that the ratio of the amplitudes of the stationary wave at an antinode and node respectively 2:1

41. ## physics

Water flows steadily along a uniform flow tube of cross-section 30cm^2. The static pressure is 1.20 x 10^5 Pa and the total pressure is 1.28 x 10^5 Pa. Calculate the flow velocity and the mass of water per second flowing past a section of the tube.

42. ## physics

A plane progressive wave on a water surface is given by the equation y=2sin2pi(100t-x/30) where x-is the distance covered in a time t, x, y and t are cm and second respectively. Find (i) the wavelength and frequency of the wave motion. (ii) the phase

43. ## Math

Use the normal distribution of weights of adult men, which has a mean of 170 pounds and a standard deviation of 7.5 pounds. Use the z-score chart to find the percentage of heights less than 155 pounds.

44. ## math

please can u help me for my homework thanks a lot the question is below.. A container is 1/3 full of water and 1/4 full of oil. What fraction of the container is empty?

45. ## physics

a fluid flows through a horizontal pipe of varying cross-section. Assuming the flow is streamline and applying the bernoulli equation, show that pressure in the pipe is greatest where cross-sectional area is greatest.

46. ## Math

The temperature was -5∘F and then fell 8∘F. Don't get it

47. ## math

The 3rd term in an arithmetic sequence is 12, the 7th term is 24, a) How many common differences are there between a_3 and a_7? b) What is the common difference of the sequence? c) What is the first term in the sequence? a_1 d) What is the expression for

48. ## Science

Based on your knowledge of the relationship between photosynthesis and CO2, explain why CO2 concentrations cycle throughout the year.

49. ## physics

A silver wire has resistance of 2.1ohms at 27.8 degree celsius and resistance of 2.8ohms at 98 degree celsius. Determine the temperature coefficient of resistance of silver wire and its resistance at zero deg.

50. ## math

(b) the digits of a positive integer having three digits are in A.P and their sum is 15. The number obtained by reversing the digits is 594 less than the original number. Find the number. (c) if a,b,c are in A.P, prove that (i) (ab)^-1, 1/ac, 1/bc are also

51. ## math

use the clues to find the 7th digit mystery number. * Its is between 1 and 2 million * the first three digits are the same the least possible digit is in the thousands place. *the greatest possible digit is in the ones place * the hundreds digit is 1 more

52. ## physics

If the amplitudes of the two waves are 3 units and 1 unit respectively, show by the principle of superposition that the ratio of the amplitudes of the stationary wave at an antinode and node respectively 2:1

53. ## The Inspection Process

In some states, real estate agents are legally required to A. back up the claims their clents make about home conditions. B. appraise the values of the properties they sell. C. hire home inspectors to perform pre0sale inspections. D. pay the fees the

54. ## Algebra

What is the smallest positive integer?

55. ## MATH

FORTRAN ROGRAM THAT CAN ACCEPT TWO INTEGER NUMBERS AND COMPUTE AND DISPLAY ALL THEIR COMMON PRIME FACTORS

56. ## physics

The electrical motor runs on a D.C source of emf E and internal resistance r. Show that power output of the motor is max where current drawn by the motor is E/2r.

57. ## physics

The density of nitrogen at STP is 1.25 kgm^-3. Find the r.m.s velocity of nitrogen molecule at 20 degree centigrade.

58. ## math

(b) the digits of a positive integer having three digits are in A.P and their sum is 15. The number obtained by reversing the digits is 594 less than the original number. Find the number. (c) if a,b,c are in A.P, prove that (i) (ab)^-1, 1/ac, 1/bc are also

59. ## math

in a class of 40 students, 80% are business majors. of the 24 students who passed the midterm exam, 75% are business majors. What percertange of students in the class who are not business majors passed the examination

60. ## environmental science

Explain the significance of oxygen and carbon dioxide in an ecosystem?

61. ## College Algebra

3x^2-12x-24=0

62. ## physics

A small source O of electromagnetic waves is placed some distance from a plane metal reflector M. A receiver R, moving between O and M along the line normal to the reflector, detects successive maximum and minimum readings on the meter joined to it. (a)

63. ## Physics

Two spheres S1 and S2 of the same metal and having the same type of surface, have radii 20cm and 10cm respectively. Compare their rates of fall of temperature as they cool (a) when S1 is at 50 degree centigrade, S2 is at 40 degree centigrade, the

is the most important step to help improve America's business ethics?

65. ## science

Which of the following would require more energy to heat it from 10°C to 20°C? a. 200 kg of water b. 200 kg of aluminum c. 100 kg of steel How much heat energy is required to raise the temperature of 20 kilograms of water from 0°C to 35°C?

66. ## law

How has the feminist movement influenced criminology? What negative impact has resulted from feminism, if any?

67. ## Physics

Yep its me again... sorry for re-posting this question but I am quite desperate here and I need to have this question answered, sorry if that sounds rude. IF 2.0 J of work is done raising g apple how far is it lifted? I know W= Fd hence I divided instead

68. ## physics

A clean glass capillary tube is held vertically in water raised to a height of 7cm. The tube is down depressed and only 5cm of its length is above water. What will be the angle of contact?

69. ## physics

In the design of a passenger bus, it is proposed to derive the motive power from the energy stored in a flywheel. The flywheel, which has a moment of inertia of 4.0 x 10^2 kgm^2, is accelerated to its maximum rate of rotation 3.0 x 10^3 revolutions per

70. ## physics

A clean glass capillary tube is held vertically in water raised to a height of 7cm. The tube is down depressed and only 5cm of its length is above water. What will be the angle of contact?

71. ## calculus

evaluate tan^2 3.658 I know the answer is .322 but I don't know how to arrive at the answer.

72. ## Science

Why can multicellular organisms be more complex than unicellular organisms?

73. ## Science

Two trains are traveling towards each other, starting 100 kilometers apart. One train travels at 40 kilometers per hour while the other travels at 60 kilometers per hour. The plane starts flying at 90 kilometers per hour, starting from the location of the

74. ## Physics

A golf ball hit at a speed of 77 m/s will carry (achieve its maximum flight distance of) 256 m when driven at a launch angle of 16 deg. What would be its horizontal range in a vacuum if launched at the same speed and at the same angle ?

75. ## Physics

A third baseman makes a throw to first base 39.7 m away. The ball leaves his hand with a speed of 37.0 m/s at a height of 1.5 m from the ground and making an angle of 19.5 o with the horizontal. How high will the ball be when it gets to first base?

76. ## Physics

A person rides a motorbike 145 m along a road that slants upward at 4.5 o from the horizontal. How much higher will the rider be at the end of the trip? How far has the rider gone in the horizontal direction?

77. ## English

I would for you to overlook my narrative essay, for corrections and your advice. The essay is not finished, but would like to know am I on the right path. A Painful Moment It was the summer of 1998; I was twenty years old celebrating the 4th of July with

aphabet on move words

79. ## law

What are the policy implications of social development theories? How have these implications been reflected in actual policy, if at all?

80. ## social studies

what are the main assumptions underlying organizational communication?

81. ## math

A straight line AB of length 10 units is free to move with its ends on the axes. Find the locus of a point P on the line at a distance of 3 units from the end on the x axis.

82. ## physics

A clean glass capillary tube is held vertically in water raised to a height of 7cm. The tube is down depressed and only 5cm of its length is above water. What will be the angle of contact?

83. ## physics

A clean glass capillary tube is held vertically in water raised to a height of 7cm. The tube is down depressed and only 5cm of its length is above water. What will be the angle of contact?

84. ## physics

Show that a force acting along a given line can always be replaced by a force of the same magnitude acting along a parallel line, together with a couple.

85. ## physics

A vibrator attached and resting on the surface of water generates plane water waves and its propagation is found to take 50 seconds to reach a floating cork 65 cm away. If the cork subsequently vibrates with SHM of a period 3.8 seconds, determine the

86. ## physics

A plane sound wave propagated in air has individual particles which execute a periodic motion such that their displacement y from their rest position at any time t is y=5x10^(-6)sin(800pie(t)+theta). Calculate (i) wavelength. (ii) phase diff in degree

87. ## Physics

24 kg of water are heated by a thermostatically controlled 4Kw electric heater. The thermostat switches the heater on at 60 degree centigrade and off at 65 degree centigrade. If the time between switching off and switching on is 3.0 min, what will be the

88. ## The Inspection Process

In some states, real estate agents are legally required to A. back up the claims their clents make about home conditions. B. appraise the values of the properties they sell. C. hire home inspectors to perform pre0sale inspections. D. pay the fees the

89. ## PHYSICS

AN ELECTRIC FIELD 1500N AND MAGNETIC FIELD 0.40T ACT AT A,MOVING PROTRON TO PRODUCE NO FORCE.CALCULATE THE MINIMUM SPEED OF THE PROTRON.

90. ## Maths

From 1 to 9, which number should be put in the middle of a magic square( 3 by 3 magic square), so that no matter how you add three numbers in a straight line .... up, down, sideways or diagonally .... you will get the same answer.

what does multi-tier supplier mean?

define a supply chain driver and show it's relation to supply chain focus with a couple of examples

93. ## Social studies

In what year did Napoleon lead the battle of waterloo?

94. ## statistics

A study was conducted to investigate the relationship between the cost, y (in tens of thousands of dollars), per unit of equipment manufactured and the number of units produced per run, x. The resulting equation for the line of best fit is given below,

95. ## MATH

given ax^2 +bx +c=0. one root is square of the other, without solving the expression proove that: c(a-b)^3 = a(c-b)^3

96. ## physics

Show that a force acting along a given line can always be replaced by a force of the same magnitude acting along a parallel line, together with a couple.

97. ## physics

A beam of electromagnetic waves of a wavelength 3.0cm is directed normally at a grid of metal rods, parallel to each other and arranged vertically about 2.0cm apart. Behind the grid is a receiver to detect the waves. It is found that when the grid is in

98. ## physics

Show that a force acting along a given line can always be replaced by a force of the same magnitude acting along a parallel line, together with a couple.

99. ## physics

Find (a) the potential and (b) the field strength at points A and B due to two small spheres X and Y 1.0m apart in air and carrying charges of +2.0x10^-8C and -2.0x10^-8C respectively.