Posts by Ruth

Total # Posts: 331

1. Math

An arc of lemgth 28cm subtends an angle at the centre of a circle. In the same circle, what angle does an arc of length 35 subtend
2. chemistry

What separatation method used to separate silver chloride (solid))and sodium trioxonitrate
3. English

Vaping should be outlawed. Agree or disagree?
4. Chemistry

Hydrazine has the formula N2H4 and is used as a rocket fuel (e.g. for the Apollo moon rockets). It burns in the following reaction for which the enthalpy change is -583 kJ/mol. N2H4(g) + O2(g) ? N2(g) + 2 H2O(g) Calculate the N-N bond enthalpy in hydrazine given the following ...
5. physics

A stunt flier is moving at 15m/s parallel to the flat ground 100m below,how large must the distance x from plane to target be if a sack of flour released from the place is to strike the target?
6. physic

33. An automobile tire is rated to last for 50,000 miles. Estimate the number o revolutions the tire will make in its lifetime.
7. Math

Find the square root of 25xsquared-40xy+16ysquared
8. Maths

Two boats A and B left a port C at the same time on different route .B travelled on a bearing of 150 degree and A travelled 8km and B had travelled 10km ,the distance between the Two boats was found to be 12km .calculate the bearing of A's route from C.
9. HOME ECO

ANOTHER WORD FOR NUTRITION

60
11. Pre calc

sin(? ? ?); tan(?) = 5/12 ? in Quadrant III, sin(?) = ? sqaure root10/10 ? in Quadrant IV. I used the sin equation sin(a)cos(b)-sin(a)cos(b) However I am still getting the wrong answer
12. Pre calc

evaluate the expression under the given conditions. cos(? ? ?); cos(?) = 5/13, ? in Quadrant IV, tan(?) = ? square root15,? in Quadrant II Anyone know how to do this I have never been this confused in my life
13. Pre calc

A 20-ft ladder is leaning against a building. If the base of the ladder is 7 ft from the base of the building, what is the angle of elevation of the ladder? (Round your answer to one decimal place.) How high does the ladder reach on the building? (Round your answer to the ...

Please assist me to factorise the following. 4x^3 + 5x^2y - 4xy^2 - 5y^2 \
15. pre calc

To measure the height of the cloud cover at an airport, a worker shines a spotlight upward at an angle 75° from the horizontal. An observer D = 600 m away measures the angle of elevation to the spot of light to be 45°. Find the height h of the cloud cover. (Round your ...
16. Math

Each day Trinh buys a can of soda at a machine in her apartment building for \$.75. Instead, she could buy a 12-pack at the grocery store for \$4.99. If she did this, how much money would she save in a month
17. physics

Helium gas occupies a volume of 0.04 m 3 at a pressure of 2 x 10 5 Pa (Nm -2 ) and temperature of 300 K. Calculate (i) the mass of the helium. (ii) the r.m.s. speed of its molecules. (iii) the r.m.s. speed at 432 K when the gas is heated at constant pressure to this ...
18. physics

I don't know pls can u fully explain the answer
19. Physics

a 1 kg textbook has been pushed and let go sliding to the left on a flat table no one is pushing the book at this moment. it is sliding a. calculate the weight of the textbook? How do I do these calculations? b. based on this weight, what must the normal force from the table ...
20. maths

A restaurant offers a new promotion of 20% off,the original price of cheese pizza,which is \$12 before the promotion 250 pizzas were sold each day.after the promotion the sales of pizza increase an average of 18% more per day. How much more or less does the restaurant make each...
21. maths

Three bags of wheat,two bags of corn, and one bag of oats weigh the same as one bag of wheat,one bag of corn and five bags of oats,if two bags of corn and one bag of oats weights 25 pounds and one bags of corn weights 10 pounds,How much does one bag of wheat weight?
22. world geography

The North African Maghreb states, dominated by the Atlas Mountains, do not include A. Libya. B. Algeria. C. Morocco. D. Tunisia.

Jdid
24. physics

What is quantity of heat required to melt down completely 1kg of ice at 30 degree celsius
25. physics

consider a series R-C circuit consisting of a 30 ohm resistor and 20*10^-6F capacitor connected to a 100V,50Hz power supply.find the magnitude of the current and the angle by which the current leads the voltage.
26. physics

prove that I=square root of (I^2avarage). using I=Iosin(wt)
27. physics

a conducting loop consisting of a half circle of radius r=0.2m and three straight sections the half circle lies in a uniform magnetic field B that is directed out of the page the field magnitude is given by B=(4t^2 + 2t + 3)T .w/r t is in second. an ideal battery with emf=2v ...

29. chemistry

what kind of reactions require oxidizing agent(reduced or oxidized) for example SO3->SO4 does it require oxidizing or reducing agent why?
30. science

acetic acid has a pka of 4.8 how many ml of 0.1M acetic acid and 0.1M sodium acetate are required to prepare 1L of 0.1M buffer with a PH of 5.8? solve
31. physics

a)find the charge to mass ratio for an electron accelerated through 600v in a magnetic field of strength 45mT where the speed of the electrons is 1.4*10^7m/s b)what is the percentage difference b/n your result and the accepted ratio with the value q=1.6*10^-19C and m=9.11*10^-...
32. physics

an electron moves in the plane of paper toward the top of the page .a magnetic field is also in the plane of the page and directed toward the right .what is the direction of the magnetic force on the electron ?
33. physics

a student connects the ends of a pencil lead to a 6.0V supply and measures the current to be 8.6A.the lead is rod of graphite of length 7.5 cm and diameter 1.4mm. a)calculate the resistance of the pencil b)use this data to calculate the resistivity of graphite
34. physics

a galvanometer has a resistance 60 ohm and is of 5mA full scale deflection.how would you modify it so as to get 0-10V voltmeter
35. Math

Without using table....log(base 5) (8/2) + log(base 5) 3(15/2) -log(base 5) (81/8)
36. introduction to organisational psychology

how the organization of your choice goes about changing attitudes of their employees?
37. introduction to oorganisational psychology

conflict has always been a part of our lives, especially in the decision making processes. write down a case of multiple approach-avoidance conflict that you have experienced personally. how did you react? do not forget to include all the variance of this type of conflict in ...
38. phychology

classical conditioning , develop analogy for industry
39. chemistry

if B is halved it should be 1.5 not 1/8 right
40. chemistry

the reaction A+3B—>2C+D is first order with respect to reactant A and second order with respect to reactant B if the concentration of A is doubled and the concentration of B is halved the rate of the reaction would---------------by a factor of-----------
41. chemistry

the reaction A+3B->2C+D is first order with respect to reactant A and second order with respect to reactant B if the concentration of A is doubled the concentration of B is halfed and the rate of the reaction would -------by a factor of --------
42. chemistry

the reaction A+3B->2C+D is first order with respect to reactant A and second order with respect to reactant B if the concentration of A is doubled the concentration of B is halfed and the rate of the reaction would -------by a factor of --------
43. physics

how many electrons drift past a point on for 10 minutes current is 0.2 A.the charge on one electrons 1.6*10^-1
44. physics

1)a galvanometer has a resistance of 40 ohm and is of 3 mA full-scale deflection.how would you modify it to act as a 0-5 A ammeter? 2)the galvanometer described in question 1 is to be converted into a 0-5 V voltmeter. a)when the voltmeter is connected to a 5 V supply ,how ...
45. physics

calculate the maximum working current of an appliance rated at 2.4kw with an operating voltage of 240v
46. physics

calculate the maximum working current of an appliance rated at 2.4kw with an operating voltage of 240v
47. physics

calculate the value of the resistor that will give a total resistance of 4 ohms if it is connected in parallel with a 12 ohm resistor.
48. math

okai now I have the idea I will do myself from now on and for this 20cm^3/min=4π(2cm)^2dr/dt
49. math

a spherical ballon is inflated with gas at the rate 20cm^3 min. how fast is the radius of the ballon changing at the instant when the radius is 2cm
50. math

the radius r of a right circular cone is increasing at a rate of 2cm/min.the height h of the cone is related to the radius by h=3r.find the rate of change of the volume when r=6cm
51. math

can you add one more step am not just sure
52. math

find dy/dx assuming that y is differentiable with respect to x and x is also differentiable with respect to y. a)xy+x^2y^2=x^3y^3 b)xsiny+ycosx=xy
53. math

ohhhh ya sorry I get it
54. math

where did 8 come from
55. math

the radius r of a sphere is increasing at a rate of 3cm/min. find the rate of change of the area when r=3cm
56. physics

find the drift velocity of the electrons in the copper wire (there are 8.5*10^28 free electrons per m^3 in copper)
57. math

a manufacturer wants to design an open box that has a square base and a surface area of 48sq units what dimension will produce a box with a maximum volume?
58. physics

a parallel plate capacitor has an area of 5cm^2 and a capacitance of 3.5PF. the capacitor is connected to a 12v battery .after the capacitor is completely charge up the battery is removed. a)what must be the separation of the plates and the charge density on the plate b)what ...
59. chemistry

Solutioin A is sodiun hydroxide prepared by dissolving 2.0g in 250cm what is molar concentration of sodium hydroxide
60. English

What attitude does the writer of the following sentence seem to have towards gun control? What words convey that this attitude: The anti-gunners are constantly lobbying congress, whining about people killing Bambi.
61. math

The base of triangle is 2cm less than the altitude and the area of the triangle is 60cm². calculate the altitude.
62. Algebra

Martina hits a volleyball with a velosity of 13 m^s. When she hits the ball it is 1m above the ground. How long will ot take for the ball to hit the ground.

2 - 9
64. math

lnx monotonicity
65. physics

so it will be kq(4Q/a/2)
66. physics

at the centre or one of corners
67. physics

what is the potential energy of 4 point charges each of value Q at the corners of a square of side length a.
68. math

2x e^x^2+x^2 ex^2
69. math

what is the 3rd derivative of f(x)=x^2 e^x^2
70. math

if h(x)=sinπ/x then find hderivative(4)
71. Physics Geography Mathematical Literacy Life scien

Wich career may i follow
72. Algebra

How do I answer this? Robert needs to cut four shelves from a board that is 2.5 meters long. The second shelf is 18 centimeters longer than twice the length of the first shelf. The third shelf is 12 centimeters shorter than the first shelf. The remaining shelf is 4 centimeters...
73. science

. If Lesley’s mother has the genotype BB and her father has the genotype bb, what is Lesley’s genotype? What is her phenotype?
74. Math

For what values of k does the line y= x + k pass through the circle defined by x^2 + y^2 = 25 at: 2 points? 1 point? 0 points? I found the discriminant: 100- 4k^2 but i don't know how to find for each of the points
75. Math if my answer is correct

The function h(t) = 2 + 50t - 1.862t^2, where h(t) is the height in metres and t is the time in seconds, models the height of a golf ball above the planet Mercury's surface during its flight. A) How long will the ball be above the surface of Mercury? I get t= 22.02 and 4....
76. Chemistry

how many grams of potassium hydroxide would need to be added to 400 mL of 0.150M HNO3 to raise its pH to 2.5
77. Math

This is more of a logic question. Let B = blue, R = red, and G = green. If you choose 3 balls, they COULD be three of the same color, but not necessarily. They could be B,R,G. Four balls could be B,B,R,G. Five balls could be B,B,R,R,G. Six balls could be B,B,R,R,G,G and you ...
78. algebra

Graph the equation y = 4 x + 8. How do you solve For y and x so I can graph the equation?
79. PSY 410 Abnormal Psychology

Thank you this helps!
80. PSY 410 Abnormal Psychology

HELP- My text book wont let me open on my laptop and I can't seem to find the information I need. Create a timeline that displays the development of abnormal psychology. Include at least seven main milestones
81. math

what is the money value of 0.098
82. Chemistry

Give a acid-base pairs which produce Na2CO3 as a salt

The height y (in feet) of a baseball thrown by a child is y = -1/10 x^2 + 3x + 6 where x is the horizontal distance (in feet) from where the ball was thrown. Will the ball fly over the head of another child 30 feet away trying to catch the ball? (Assume that the child who is ...
84. physics really stuck

A sprinter starts from rest and accelerates for 5s. He then travels at a constant velocity for 10s. Finally he slows down to a stop in 5s. Draw a distance time graph to represent his motion.
85. Physics

How do you convert a distance time graph to a velocity time graph. In my first distance time graph, i have 3 curves, two are above the x axis the the middle curve is under the x axis. i am confused on how to change this graph into a velocity time graph since i cant find the ...
86. Physics

A body travels from rest with acceleration 8m/s(squared)Find its velocity when it has covered a distance of 100 meter?
87. Math

Venski and his brother have each agreed to mow half of the front lawn, which is a rectangle, 120 feet by 60 feet. The law mower cuts a 4-foot-wide strip. If Venski starts at one corner and mows around the lawn toward the center, on which trip around will he have half the area ...
88. stats

If a random sample of size n = 65 is drawn, find ¦Ìx, ¦Ò x and P(24 ¡Ü x ¡Ü 26). (Round ¦Ò x to two decimal places and the probability to four decimal places.) ¦Ìx = Correct: Your answer is correct.
89. Math

Color this square so that one-half is green,one-third is yellow and and the rest is brown.Each triangle should be just one color.Make any pattern you like. How much of the square is brown?
90. Math

Which digit (0-9) occurs most often on a calendar for this month. Which occurs least often? Is the answer the same for every month of this year?
91. math

A rancher wishes to use 86 ft of fencing to enclose a rectangular paddock and subdivide the region into three smaller areas. If the total enclosed area is 225 ft2, find the dimensions of the enclosed region.
92. math

A rancher wishes to use 86 ft of fencing to enclose a rectangular paddock and subdivide the region into three smaller areas. If the total enclosed area is 225 ft2, find the dimensions of the enclosed region.
93. Algebra (Word Problem)

Jack and Jill each tipped their waiter 50 dollars. Jack tipped 4% of his bill while Jill tipped 10% of her bill. What is the total bill of the two?
94. maths

A straight highway leads to the foot of a tower of height 50m. From the top of the tower, the angles of depression of two cars standing on the highway are 30 degree and 60 degree. What is the distance between the two cars and how far is each car from the tower ?
95. maths

A straight highway leads to the foot of a tower of height 50m. From the top of the tower, the angles of depression of two cars standing on the highway are 30 degree and 60 degree. What is the distance between the two cars and how far is each car from the tower ?
96. maths

The shadow of a tower standing on a level ground is found to be 2x meters longer when sun's altitude is 30 degree than when it was 45 degree.Find the height of the tower.
97. figure of speech

The World is as big as....
98. Algebra

Consider two points A=(2,5) and B=(4,3), and a third point P=(a,b) on the x-axis. If the minimum value of line PA^2+ line PB^2 is c, what is a+b+c?
99. Algebra (Work Problem)

Susan's backyard has three faucets: A, B and C. If she turns on all three of them, it takes 380 minutes to fill the pool. If she turns on only A and B, it takes 570 minutes, and if she turns on only B and C, it takes 760 minutes. If she turns on only A and C, how long will...
100. Algebra

Find the equation of the circle having the given center and radius. center (-5,1), radius 6 squared.
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