# Francis

Popular questions and responses by Francis
1. ## Science

A uniform have metre rule,pivoted at 20cm mark balances horizontally when a mass of 50g is suspended from 4cm mark calculate the mass of the metre rule.

2. ## maths/permutation and combination

Find the number of ways, the digits 0,1,2 and 3 can be permuted to give rise to a number greater than 2000. Please I need an explanatory workings!!!

3. ## math

97 is the largest prime less than 100. What is the largest prime factor of 97! (97 factorial)? (Reminder: The number n! is the product of the integers from 1 to n. For example, 5!=5*4*3*2*1= 120.)

4. ## physics(waves)

A wave has a speed of 340m/s and a period of 0.28ms. what's the wavelength? so I worked this and I got 95.2m but the answer to d question says 0.095m. period(T) = 1/F (since F = 1/T) therefore, F = 1/0.28 = 3.5714 wavelength = velocity/frequency w =

5. ## Physics

1. A cylindrical disk of wood weighing 45.0N and having a diameter of 30.0 cm floats on a cylinder of oil of density 0.850 g/cm3. The cylinder of oil is 75.0 cm deep and has the same diameter of the wood. (a) What is the gauge pressure at the top of the

6. ## math

What is the greatest prime factor of 3105?

7. ## maths(direction cosines of vectors)

find the direction cosines of the vector joining the two points (4,2,2,) & (7,6,14) (this is new to me, used to think it was just one point not two.)

8. ## mechanics and fluids

a block of mass 6 kg resting on a horizontal surface is connected by a cord passing over a light, frictionless pulley to a hanging block of mass 4 kg. the coefficient of kinetic friction between the block and the horizontal surface is 0.5. after the block

9. ## physics

what is the minimum effort required to raise a load of 5kg in an ideal pulley system taking gravity to be 10m/s/s

10. ## Maths

The line x 7y=5 cuts the circle x^2 y^2=15 at the points P & Q. Find: a) P & Q. b) the midpoint of PQ.

11. ## competitiveness,strategy,and productivity-operatio

As a consumer,what things do you consider in judging the quality of cookies you buy in a supermarket

12. ## Physics

You cool a 100g slug of red hot iron (745oC) by dropping it into an insulated cup of negligible mass containing 75.0g of water, at 20oC. Assuming no heat exchange with the surroundings (a) what is the final temperature of the iron? (b) what is the final

13. ## social studies

Why did Christianity develop as its own religion?

14. ## PHYSICS

An entertainer juggles balls while doing other activities. In one act, she throws a ball vertically upward, and while it is in the air, she runs to and from a table 5.50m away at a constant speed of 2.50m/s, returning just in time to catch the falling

15. ## physics

A pupil pushes a wheelbarrow carrying 30kg sand it accelerates from rest to 2m/s in the distance of 1m. If the friction is on the wheelbarrow is 0.5n find accelaration

16. ## physics

A solid of mass 1kg suspended by a string is completely immersed in water. If the tension in the string is 5N, calculate the upthrust on the solid. (take g = 9.78m/s)

17. ## gallegos

"Robert can swim the first 50 meters of a race in 1 minute. Then he slows down by 12 seconds for each of the next 50 meters of a race. How long will it take Robert to swim a 400-meter race?

18. ## Science

C6H5NH2 + H2O C6H5NH3+ + OH- 1. Aniline, a weak base, reacts with water according to the rxn above. a. A sample of aniline is dissolved in water to produce 25.0 ml of a .10 M soln. The pH of soln is 8.82. What is Kb for this rxn? b. The soln in part b,

19. ## Astronomy

Which of the different telescopes designed for the following specific types of electromagnetic waves has to be at the highest altitude from the surface of the Earth to be useful? a. Near (to visible) infrared b. Radio c. Visible d. Far UV to X-ray

20. ## Math

M varies directly as the square of N. If N increases by 10%, find the percentage change in M

21. ## Physics

Calculate the specific heat capacity of substance x from the following data. A container made of the substance x has a mass of 3.6kg and contains 14kg of water. A 1.8kg-piece of the substance x initially at the temperature of 180°C is dropped into the

22. ## chemistry

what is the percentage yield of c2h2 with 50g of cac2 reacts with water to yield 13.5g of c2h2

23. ## applied chemistry

Draw electron dot diagram for the following compound HCL,CO2,NH3,NH4CL,CH4 And H2O2

Assume venture Healthcare sold bonds that have a ten year maturity,a 12 percent coupon rate with annual payment,and a \$1000 par value.Suppose that two years after the bonds were issued ,the required interest rate fell to 7 percent .what would be the bond

25. ## math

4.In Amy’s English class, 30% of the students play an instrument. She does not know how many in the whole school play an instrument, but there are 500 students in the school. A.Solve the proportion 30/100=n/500 to estimate the total number of students in

26. ## maths

What's the coefficient of x^2 in the expansion of (2 - 1/2x)^4 (I've no idea hw to go bout this & I would also like to know under which topic it falls)

27. ## math

The line x plus 7y=5 cuts the circle x^2 plus y^2=15 at the points P & Q. Find: a) P & Q. b) the midpoint of PQ. (I don't know why, but the plus sign does not show after I submit d question so dats y I wrote it in words)

28. ## physics

Calculate the energy required to vapourise 50g of water Initially at 80¡ãC if the specific heat capacity of water is 4.2 J/g.k. (specific latent heat of vapourisation of water is 2260 J/g)

29. ## Maths

find the equation of the perpendicular bisector of the line joining P(2, -4) to Q(-5,1) A. 8y-14x 13=0 B. 8y-14x-13=0 C. 8y 14x-13=0 D. 8y 14x 13=0 Please I need someone to help me with this, with an explanatory workings.

30. ## MATH ANALYSIS & TRIG

At noon, Al is 6km north of point O traveling south at 10km/h. Also at noon, Barb is 2km east of point ) traveling east at 5km/h. A) express the distance "d" between Al and Barb as a function of time "t" hours after noon. B) Find the time at which the

31. ## math

tilissa was on the middle rung of a ladder.she went up 3 rungs,thendown 5 rungs and then up 7 rungs where she rested.later she climbed up the remaining 7 rungs on the ladder.how many rungs did the ladder have?

33. ## Physics

A slingshot with k = 400. N/m is pulled back 0.0500 m to shoot a 0.100-kg stone. If the slingshot projects the stone straight up in the air, (a) what is the speed when the stone is first released, and (b) what is the maximum height to which the stone will

34. ## Health care

How has the payment of health care providers evolved over time? What caused these changes?

35. ## Physics

a bike is 25% efficient in converting energy of the bicyclist to mechanical energy. If a cyclist is travelling along a pathway at a constant speed of 5.8 m/s for 3600 s, and the average resistance is 22 N, how much mass does she lose assuming 1 kg is lost

36. ## maths

in a class of 40 students,60% speak french and 50% speak english how many student speak both languages?

37. ## social studies

Which European nation controlled the Palestine Mandate from the end of World War I until the creation of modern Israel?

38. ## science

The acceleration of a bus is given by ax (t) = at, where a = 1.2 m/s3.If the bus's velocity at time t = 1.0s is 5.0 m/s, what is its velocity at time t = 2.0 s?

39. ## Maths

ABC is an isosceles triangle |BC|=10CM, A=55 degrees calculate AC

40. ## Chemistry

A sample of a curium isotope was roasted. It was determined that the product( curium oxide) contained 11,59% of oxygen.¿ What is the equivalent weight of the isotope in the oxide? ¿ What is the mass of the curium isotope? I have already gotten the answer

41. ## physics

A world-class sprinter can burst out of the blocks to essentially top speed (of about 14.9m/s) in the first 11.6m of the race. How long does it take her to finish the 200m race?

42. ## physics

An observer on Earth sees an alien vessel approach at a speed of 0.44c. The Enterprise comes to the rescue, overtaking the aliens while moving directly toward Earth at a speed of 0.89c relative to Earth. What is the speed of one vessel as seen by the

43. ## algebra

I am a 5 digit number, my tens digit is thee times the hundreds digit

44. ## Physics!

At a steam power plant, steam engines work in pairs, the output of heat from one being the approximate heat input of the second. The operating temperatures of the first are 520°C and 320°C, and of the second 310°C and 170°C. If the heat of combustion

45. ## Physics

A bar of gold and a bar of silver are used to conduct heat from one end maintained at 80.0oC and another end maintained at 30.0oC. If both bars have the same length L = 1.00m and the same cross sectional area A=100cm2 and are insulated from the outside,

46. ## Physics

A glass flask with a mass ok 3.00kg and volume of 1000 cm3 is completely filled with mercury and is at a temperature of 55.0oC. The flask is then lowered into an ice water bath. After thermal equilibrium is reached, (a) what percentage of the flask will be

47. ## Physics

Standard Temperature and Pressure (STP) is defined as a temperature of 0.00oC and a pressure of 100kPa. If the molar mass M of nitrogen is 14.0 g/mol, find the density (kg/m3) of nitrogen gas (N2) at STP. Nitrous Oxide or laughing gas is composed of the

48. ## Physics

A horizontal pipe is shown and has an area of 40.0 cm2 in wide areas and 10.0 cm2 in narrow areas. It is also connected to a U shaped tube filled with mercury. water is flowing through the pipe at a rate of 5.00 L/s. Find (a) the flow speeds at the wide

49. ## Physics

A cube of ice is taken from the freezer at -9.0°C and placed in a 71-g aluminum calorimeter filled with 261g of water at room temperature of 20.0°C. The final situation is observed to be all water at 13.4°C. What was the mass of the ice cube (in grams)?

50. ## science

Youre travelling down the road in a car with a total mass(including passengers) of 2.24 X 10^3 a)What is the change in kinetic energy of the car if you slow down from 80km/h to 70km/h(reducing your speed by 10km/h) B)what is the change in kinetic energy of

51. ## Civic education

Fundamental human right are said to be inalienable, discuss the limitations of human right

52. ## Physics

Boxes are moved on a conveyor belt from where they are filled to the packing station 11.3m away. The belt is initially stationary and must finish with zero speed. The most rapid transit is accomplished if the belt accelerates for half the distance, then

53. ## English

some have more than a hundred some have none

54. ## physics

A car A is 300m behind a car B and both are travelling in the same direction at 25m/s. Both cars begin at the same moment to accelerate at steady rate, but A has a greater acceleration and passes B in 20sec by which time B is doing 27•5m/s. Neglecting

55. ## Math

I am a number. Go round the corners of the given figure 4 times. When you add my value with the number of corners you have crossed you get 46. Find my value.

56. ## Math Analysis (Pre Calc)

A pilot wants to fly 430 miles per hour at 45 degrees north of east, but there is a westerly wind blowing 20 miles per hour. What course correction does the pilot have to make to fly on his desired landing? I wasn't able to figure out any work for this

57. ## MATH

Nicole makes a keychain by using yellow, red and green beads. The number of red beads used is more than twice the number of yellow beads by 10, while the number of green beads used is more than one-third the number of yellow beads by 7. It is known that

58. ## science

A tower is 24 m high. A stone is projected upwards from the tower, at a velocitry of 24,5 m/s. Calculate how long it would take the stone to reach the ground at the roof of the tower.

59. ## social studies

how did the wright brothers change the world a short esssay

60. ## information literacy

4. Which of the following statements about human-power search engines is true? A. People code the search engine so that they'll populate lists of trending search terms and phrases. B. Links are selected by users. C. Users send in their search request and

61. ## Electrical principles

a. What current is flowing in a 2.0m length of wire in the Earth's field of 55μT if it experiences a force of 10mN? b. A 2 wire cable is suppling 100 A to a DC motor. Each wire has a 2 mm insulation layer and there is also a 2 mm separate insulation layer

62. ## maths

Show that r = 1/4 - 3Cos¦È is polar form of an ellipse and find its centre. pls can anyone could help with this.

63. ## Math

3.Josh has a huge marble collection. He counts 280 marbles that are red, and he estimates that this is about 10% of his collection. A.Write and solve a proportion to estimate the total number of marbles Josh has.

64. ## Math

Mia took a test with 60 multiple-choice questions. Her teacher told her she got 88% correct. A.Write and solve a proportion to figure out how many questions she got correct.

65. ## Math

1.A restaurant surveys 60 of its customers about their new menu. 48 of the customers that take the survey prefer the new menu. A.Which value is unknown in this problem: the part, percent, or whole? B.Write and solve the proportion to find the percent of

66. ## Math

3.Max says there were 6 students wearing shorts in his math class. He is not sure how many people were in the class, total, but he thinks about one third of them were wearing shorts. A. What percent is closest to 1/3 ? Explain. B.Write and solve a

67. ## Math

What is 21.21% rounded to two decimal places?

68. ## Calculus

If Y = SecXTanX, find y" 4y' 4y. I can easily do the second part of the question if I could if only I could find d first and second derivative of SecXTanX, pls do help.

69. ## Differentiation

If Y = e^tanx, find dy/dx

70. ## Calculus

The volume of a solid

71. ## calculus

lim x->0 (Sin^3 3x - 3x^3)/(x^3) (x^4)

72. ## Calculus

Evaluate lim x->0 (Sin^3 3x - 3x^3/x^3 x^4) I got zero (0) to be my answer by imputing 0 in place of x but am not so sure if the answer should be 0, am thinking it should be like 1/0 or something like that.

73. ## Calculus

Find ¡Ò[dx/(x-2)(x+3)(x-4)] this is really confusing and I need help with it.

74. ## Calculus

differentiate tan-1(2x/1-x^2)

75. ## vectors

Show that a¡Á(b c) = (a¡Áb) (a¡Ác), given that a =(A B), b =(B C), c =(C A). WORKINGS ... given, a¡Á(b c) = (a¡Áb) (a¡Ác) :. imputing the values of a, b and c (A B)¡Á[(B C) (C A)] = [(A B)¡Á(B C)] [(A B)¡Á(C A)] solving for a¡Á(b c)

If a pond can support up to 10, 000 fish, the rate of growth of the fish population is jointly proportional to the number of fish present and the difference between 10, 000 and the number of fish present. The rate of growth is 90 fish per week when 1, 000

77. ## College Algebra

How to solve this system? x + [(3x-y)/(x^2+y^2)] = 3 y - [(x+3y)/(x^2+y^2)] = 0

78. ## maths

2x^2 + 2y^2 - 8x + 5y + 10 = 0

79. ## Maths (differentiation)

Differentiate Y = 1/SinX^2

80. ## maths

factorize completely X^2 + 2X^2 - 15X / 2X^2 - 18

81. ## Maths (factor theorem)

9x^2 6xy 4y^2 is a factor of 27x^3 - 8y^3, find the other factor.

82. ## Maths

(243/32)^-1/5 ¡Á 2^-2

83. ## Maths

if p:q=2/3:1/6 & q:r=3/4:1/2. find p:q:r

84. ## Maths (Integration)

Integrate(1+x/x^3)dx Don't know how to go bout this, if the numerator was a whole number it would ve been easier for me, Pls help me out.

85. ## Algebra - Functions

1) Given that F(x) = -5+7x^2, find and simplify: 8F(x) = F(8x) = 2) Find the domain of the function: f(x) = -2x+12 q(v) = ^9sqrt(-3v+14) f(x) = [(x-5)/(sqrt(15-x))] B(y) = [7/(81-(1/y^2))]

86. ## Chemistry

A sample of iron weighing 15.0 g was heated with potassium chlorate (KClO3) in an evacuated container. The oxygen generated from the decomposition of KClO3 converted some of the Fe to Fe2O3. If the combined mass of Fe and Fe2O3 was 17.9g,calculate the mass

87. ## physics

A toboggan slides down a hill and has a constant velocity. The angle of the hill is 6.50° with respect to the horizontal. What is the coefficient of kinetic friction between the surface of the hill and the toboggan?

88. ## math

A tractor tyre has a radius of 7cm and it made 1600 complete revolutions on a journey.How many metres did the tyre travel?

89. ## science

you are asked to make a 0.3M Calcium chloride solution in a flask that can hold 200ml.How would you do it.

90. ## Physics

A slingshot with k = 400. N/m is pulled back 0.0500 m to shoot a 0.100-kg stone. If the slingshot projects the stone straight up in the air, (a) what is the speed when the stone is first released, and (b) what is the maximum height to which the stone will

91. ## math

I work 1 and 1/4 hour per day how many hours do I work per week and for five weeks

92. ## gallegos

"Robert can swim the first 50 meters of a race in 1 minute. Then he slows down by 12 seconds for each of the next 50 meters of a race. How long will it take Robert to swim a 400-meter race?

93. ## Social Studies

List the unique circumstances of the interwar period that may have led to ultranationalism.

94. ## Social Studies

Which underlying circumstances occurring during the interwar period of 1919 to 1939 may have influenced whether or not nationalist interest was nationalist or ultranationalist?

95. ## Social Studies

What national interests lead to ultranationalism?

96. ## spanish

1). What is a "cognate"? 2). Why is learning cognates the most efficient and rapid way to learn to read, speak, increase vocabularly and get high marks on tests in a foreign language? Bonus question: What is the relationship between "cognates" and

97. ## trig

If x and y are complementary angles and 5 tan x-12=0,calculate by using a diagram the value of 2sin(squared)x+cos y.

98. ## Geography - Italy

My teacher gave us a reprt to do a brochure on italy such as currenices, goverment, sports, restaurants, and so far I have about 2 good website (withuout wikipedia!!!).

99. ## physics

A stone tied to a strong is made tn resolue in a horizontal circle of radius 4m with angular speed of 2 radian,persecond with what tingential velocity will the stone move off the circle if the string cuts