# Questions Asked onMarch 25, 2014

1. ## Trigonometry

find sin2x, cos2x, and tan2x if sinx= -2/sqrt 5 and x terminates in quadrant III

2. ## Trigonometry

Find all solutions of the equation in the interval [0,2pi). sec(theta)+2=0 Write your answer in radians in terms of pi

3. ## physics

A 100-g toy car is propelled by a compressed spring that starts it moving. The car follows the curved track Show that the final speed of the toy car is 0.687 m/s if its initial speed is 2.00 m/s and it coasts up the frictionless slope, gaining 0.180 m in

4. ## Physics

Assume that all of the mass of a bicycle wheel is concentrated at its rim. Such a wheel of mass 1.2 kg and radius 30 cm starts from rest at the top of a hill 100m long and inclined at 20 degrees to the horizontal. What will be the speed of the wheel at the

5. ## chemistry

Consider a buffer solution consisting of CH3NH3Cl and CH3NH2. Which of the following statements are true concerning this solution? (Ka for CH3NH3+ = 2.3 x 10 -11). 1. A solution consisting of 0.1 M CH3NH3Cl and 0.1 M CH3NH2 would be a more effective buffer

6. ## physics!!!!!

A bucket of mass 1.80kg is whirled in a vertical circle of radius 1.55m . At the lowest point of its motion the tension in the rope supporting the bucket is 28.0N. A-find the speed of the bucket. B-How fast must the bucket move at the top of the circle so

7. ## calcules

cylindrical box will be tied up with ribbon as shown in the figure. The longest piece of ribbon available is 130 cm long, and 10 cm of that are required for the bow. Find the radius and height of the box with the largest possible volume.

8. ## Trigonometry

Suppose that (5/13,y) is a point in Quadrant IV lying on the unit circle. Find y. Write the exact value not a decimal approximation

9. ## CHEM

can you show me the formula for this problem. calculate the grams of NaOH present in 9.0 ml of a 8.0 (m/v) NaOH solution. thank you

10. ## Enghish Identify pronoun errors

Identify the type of pronoun error in the sentence. 1 Neither of we boys was going to the ball game. A)reference B)case C)agreement 2)The papers are on the desk that I corrected. A)reference B)case C)agreement 3)The traffic pattern on the new road is

11. ## math

the time is 6:10 is the hour hand closer to 6 or 7? why?

12. ## spanish - HELP!

Fill in the blank with the correct direct object pronoun, based on the word in parentheses that best complete this sentence Tu ____ buscas. (nosotros) I need help with this!

37. ## College Gen.Chemistry

A student wanted to determine the amount of copper in a sample of copper ore. The student dissolved a 2.500 ± 0.001 g piece of copper ore in about 75 mL of nitric acid; then, a complexing agent was added. The student transferred this solution to a

38. ## Chemistry

if the pressure read by the barometer is 0.882atm, what is the height of the column of mercury in cm?

In "Like the Sun," all of the following would be considered "casualties" of Sekhar's truth except his • children • colleagues • headmaster • wife It almost seems it could be any of them but I need the right one.

40. ## chemistry

what is the chemical & word equation of sulfur dioxide + water i don't understand this, can someone please explain to me how to do this!!?

41. ## Math

Use the inverse matrix to solve this system of equations: 4x+3y=7.5 7x+9z=14 4y-z=8.3 A) x = -2.125, y = 3.23, and z = 4.555 B) x = 1.661, y = 2.509, and z = 0.404 C) x = 2.509, y = 1.661, and z = -0.404 D) x = 0.260, y = 2.435, and z = 1.375 E) x = 2.435,

42. ## physics

In a water park, people walk up a ramp before diving into the water below. If they cover a horizontal distance of 100 meters before diving down 50 meters, what is the angle made by the ramp with the ground?

43. ## geometry cumulative

A cylinder’s radius is reduced to 2/5 its original size and the height is quadrupled. How has the volume of the cylinder changed?

44. ## Algebra

Which kind of function best models the set of data points (–3, 18), (–2, 6), (–1, 2), (0, 11), and (1, 27)? • linear • quadratic • exponential • none of the above

45. ## chemistry

enzoic acid is a weak monoprotic acid with Ka = 6.5×10-5 M. NaOH(s) was gradually added to 1.00 L of 8.66×10-2 M benzoic acid. 1. Calculate the pH of the solution before the addition of the base. 2. Calculate the pH of the solution after the addition of

46. ## Algebra

1) which number(s) is/are a solution of the inequality? There can be more than one correct answer. A) -13 B) 25 C) 10 D) 33 2) which number(s) is/are a solution of the inequality? There can be more than one correct answer. A) 1 B) 2 C) 3 D) 4

asked by Help me 2 questions
47. ## Math

Find the radius of a circle so that it's area and circumference have the same value.

48. ## chemistry

Question Part Points Submissions Used A swimming pool, 20.0 m ✕ 12.5 m, is filled with water to a depth of 3.85 m. If the initial temperature of the water is 18.9°C, how much heat must be added to the water to raise its temperature to 28.7°C? Assume

49. ## english

choose the correct one. a) I wore all of the safety equipment for skateboarding; however, I still hurt myself. b) I wore all of the safety equipment for skateboarding, however, I still hurt myself. c) I wore all of the safety equipment for skateboarding

50. ## Trigonometry

rewrite tan(sin^-14v) as an algebraic expression in v

51. ## GENETIC HYPOTHESIS

AIM:TO DETERMINE THE NUMBER OF GR.10-12 THAT CAN ROLL THEIR TONGUE(rollers) AT SCHOOL. 1)fomulate a hypothesis. MY ANSWER:GR.11 HAS M0RE LEARNERS THAT CAN ROLL THEIR TONGUE (is it correct and any tips to master ths)

52. ## math

Sandra makes a pizza she puts mushrooms on 2/8 of the pizza she adds green peppers to 5/8 of the pizza which topping covers more of the pizza

53. ## Chemistry

The concentration of Ca2+ in a particular water supply is 5.7×10−3M. The concentration of bicarbonate ion, HCO−3, in the same water is 1.7×10−3M. What masses of Ca(OH)2 and Na2CO3 must be added to 5.6×107L of this water to reduce the level of Ca2+

54. ## math

Change decimals to a fraction 0.35

55. ## PreCalculus

The cost C (in dollars) of manufacturing x wheels at Deon's Bicycle Supply is given by the function C(x)= 0.1x^2-60x+22,744. What is the minimum cost of manufacturing wheels? Do not round your answer.

56. ## Mathematics lit, physical science, life science. Geography and englsh ,sepedi and l.o

What career m i qualify for it ?and where? And hw much m i g0ing to earn?? N how long it wil take me to learn??

57. ## world history

how did Japan consolidate its hold over its people during the interwar period?

58. ## Socials quick question

when was the champlain and saint lawrence railroad built? My guess is 1836 but I don't think that's right.

59. ## math

if 10 of the 50 pieces if candy are green, then what percent of the pieces of candy are green?

60. ## english

Identify the number of independent and subordinate clauses in the following group of words. If you could come in on Sunday, that would be great

61. ## math

Harriet spent $4050 on other supplies for her aviary. She spent$326 less on litter than she did on perches, and twice as much on nesting boxes as litter and perches combined. How much did she spend on perches?

62. ## math

Suppose 48,000 is invested at an interest rate of 4.2%, compounded quarterly. What will the account be in 10 years?

63. ## Physics

Help me understand this please You have a 2.00 kg block of lead. Lead melts at 327.5°C. CPb = 130.0 , and Hf for lead is 2.04 × 10^4 J/kg. Say you start at room temperature (25.0°C). How much heat must you transfer to melt all the lead?

64. ## math

P=347e^.023t, where t is the number of years after 1990. Use the model to estimate the population in the year 2012.

65. ## math

P=347e^.023t, where t is the number of years after 1990. According to the model, in what year will the population reach 1000?

66. ## How-To Essay Evaluation (Writeacher)

What do you think? "In order to shoot a bow accurately, the first step to take is to determine your dominant eye (the eye from which a person prefers to receive visual input). While this action might have been what you least expected, by determining your

67. ## physics

a spaceship is moving at 1000 m/s release a satellite of mass 1000 kg at a speed of 10 000 m/s. what is the mass of the spaceship if it slows down to a velocity of 910 m/s?

68. ## math

Sally made an initial deposit into an account bearing an interest rate of 7% compounded continuously. How long will it take for Sally's initial deposit to double in value?

69. ## Geography,life sciences,history,sepedi,english,maths lit and life orientation

Which course can i do due to the subjects i am doing when i go to the university?

70. ## Physics

Thanks for taking a look! A baseball of mass m1 = 0.46 kg is thrown at a concrete block m2 = 8.25 kg. The block has a coefficient of static friction of μs = 0.81 between it and the floor. The ball is in contact with the block for t = 0.165 s while it

71. ## history

how did Japan consolidate its hold over its people during the interwar period?

72. ## Science asap thankies :)

What would a permanently magnetic substance be called? I cant remember what my teacher called it, it was a short first word then magnet.. sorry and thanks!

73. ## College Gen. Chemistry - Science

You have 120.0 mL of a 0.245 M solution of NaCl in an open beaker. After several days, you test the solution and find that it now has a concentration of 0.348 M. How much water must have evaporated from the beaker given the new concentration?

74. ## College Chemistry (DrBob222)

You have 120.0 mL of a 0.245 M solution of NaCl in an open beaker. After several days, you test the solution and find that it now has a concentration of 0.348 M. How much water must have evaporated from the beaker given the new concentration?

75. ## algebra

How do I graph y=1-4x?

77. ## Math

A 3-foot piece of wood is cut into two equal sections. How long is each section in inches? a. 9 inches b. 18 inches c. 27 inches d. 36 inches

78. ## Physics

A car moving at a constant speed of 50km/h turns a corner, changing it's direction from north to west. What is it's change in velocity. What was the acceleration if the then took 5s

79. ## Math

Coach kent brings 3 quarts of sport drink to soccer practice. He gives the same amount of the drink to each of his 16 players. How many ounces of the drink does each player get?

80. ## Physics

Add the vectors 1. 6.0m N and 4.0 NE 2. 6.0m N25E and 4.0 E

81. ## Chemistry

What volume in liters will be required to dissolve 60.9 grams of Mg(OH)2? Ksp = 1.8×10-11 After doing the math, i got 1.58e-4, but its not right, so i have no idea what to do now.

141. ## Physics

When a rubber rod is rubber with wool, the rod becomes negatively charged. What can you conclude about the magnitude of the wool's charge after the rubber process? Why? Please Help!!

142. ## Physics

When a rubber rod is rubber with wool, the rod becomes negatively charged. What can you conclude about the magnitude of the wool's charge after the rubber process? Why? Please Help!!

143. ## math

an open-topped box can be made from a rectangular sheet of aluminum, with dimensions 40 cm by 25 cm, by cutting equal-sized squares from the four corners and folding up the sides. Declare your variables and write a function to calculate the volume of a box

144. ## Chemistry

10.1g of potassium nitrate were dissolved in 50cm^3 of water. the temperature fell by 16 degrees celsius. Determine (a) the number of moles of potassium nitrate dissolve in 50cm^3 of water. (b) heat change that would be produced if one mole of potassium

145. ## chemistry

how many moles of H2O are produced when 5.00 mols of oxygen gas are used

146. ## Algebra

Graph the solution to the inequality on the number line |4u-8|=>12

147. ## Human Resources

Contrast the arguments concerning union membership that are likely to be presented by a union with those likely to be presented by an employer.

148. ## Physics

An aluminum calorimeter has a mass of 60g and an initial temperature of 25oC. What is the final temperature attained when 86.8g of water at 90oC is poured into it?

149. ## math

Which type of graph would best display the numbers of each type of vehicle sold by a large dealership during a year? A. bar graph B. circle graph C. line graph D. line plot

150. ## social studies check answers

1.C 2.D 3.A 4.D 5.C 6.B 7.D 8.B 9.B 10.A 1.The story of Omar best reflects A. opportunities for people in the Pampas. B. struggles faced by families who work the mines of the Andes. C. hardships undertaken by indigenous farming families. D. benefits of

151. ## ALGEBRA

DAmon you equaled them to zero that is not rightt An open-topped box can be made from a rectangular sheet of aluminum, an open-topped box can be made from a rectangular sheet of aluminum, with dimensions 40 cm by 25 cm, by cutting equal-sized squares from

152. ## PHysics XXX

An airplane travels 330 m down the runway before taking off. Assuming that it has constant acceleration, if it starts from rest and becomes airborne in 9.00 s, how fast (in m/s) is it moving at takeoff? A 73.3 m/s B 36.7 m/s C 1490 m/s D 660 m/s

153. ## physics

A car entering the freeway accelerates from 10.2 m/s with a constant acceleration of 4.4 m/s2. What is the car’s final velocity when it merges onto the highway and reaches its cruising speed 4.2 seconds later? A 28.7 m/s B 11.2 m/s C 18.5 m/s D 8.28 m/s

154. ## Physics

A 150g piece of copper is heated to 100oC. It is then held in the open air for 2 minutes and 31 seconds, and then dropped into a 100g copper calorimeter containing 200g of water at 17oC. If the rate of loss of heat of the copper piece while held in the air

155. ## physics

What is the pressure that is exerted by a box tjat has a dimension of 12cm long and 14cm wide and has a force of gravity on the box of 40N?

156. ## Physics

The bulk modulus of a liquid is 4.0 10^10 N/m2. Suppose a volume of 0.6 m3 of the liquid is taken from the surface where the pressure is approximately that of the atmosphere (1.00 10^5 N/m2) and is lowered into a pool of liquid to a depth where the

157. ## chemical

wavelength .989 nm strikes a surface the emitted electron has a kinetic energy of .969eu

158. ## ****HELP**** STATISTIC

The table below shows the probability distribution of the types of food purchased by students from the school cafeteria. What is the probability a student has purchased Caesar salad? (2 points) 0.17 Suppose houses are available for purchase during

159. ## CHEM

Can you show me the formula I need to do this problem. please a solution is made by dissolving 0.35 mole of LiI in enough water to give a final volume of 2.60 ml. What is the molarity of the solution? thank you

160. ## Math

The three interior angles of a triangle are in a 1:3:6 ratio. Find the measure of the largest angle?

161. ## geometry

is every composition of transformations cumalitive? In other words, does the order matter? I think it depends on transformation, but I'm not sure

162. ## geometry

Find the hypotenuse of a triangle with legs length 12 cm and 14 cm. Round to the nearest tenth

163. ## science

As you airplane taker off from an airstrip on the ground and rises 30,000 feet into the sky what happens to the air pressure on the outside of the airplane ? Answers are Air pressure decreases Air pressure increases Air pressure stays same more information

164. ## physiscs

what is emitted by the vibrating electrons of attoms

165. ## Pre Algebra

can a trapezoiodal prism equal a triangular prism and rectangular prism combined

166. ## chemistry

How do I determine how many moles of KMnO4 it takes to neutralize C2O4-?

167. ## Pre Algebra

what figure has 3 lateral faces that are rectangales

168. ## Calculus

Find a positive number such that the sum of the square of the number and its reciprocal is a minimum.

169. ## English

1. For here or to go? - For here. 2. Here or to go? - Here 3. Is this for here or to go? - For here. 4. Is this here or to go? - Here. (Which ones are grammatical?)

170. ## Trigonometry

Find all solutions to the equation tan(theta)+sqrt3=0 Write your answer in terms of pi and us the or button as necessary.

171. ## biology - genetics

how do you compare the reversibility of point mutations and microsatellites? I thought point mutations could reverse but microsatellites can't but idk the reason.

172. ## U.S History - Pls check my answer!!!

Document C Andrew Jackson’s Message to Congress, Dec 7, 1829 The condition and destiny of the Indian tribes within the limits of some of our states have become objects of much interest and importance. By persuasion and force they have been made to retire

173. ## English

How do you pronounce "Dacha" in Russian? A dacha is a Russian country house.

174. ## Physics

1. A car decelerates at -3.8 without skidding when coming to rest on a level road. What would be its deceleration if the road is inclined at 9.3° and the car moves uphill? (Asume the same static friction coefficient and the car is on the verge of