1. Math

There are 12 more toy cars than toy trucks in a toy box with a total of 38 toy cars and trucks. How many toy trucks are in the toy box?

2. chemistry

If potassium chlorate is 80 percent pure ,then 48gram of oxygen would produced from how many gram of potassiumchlorate

3. Maths

Prove that CosB-cosA/cosA+cosB=tanA+B/2tanA-B/2

4. Math

Pen has 1/2 cup and 1/8 cup measuring cups. What are two ways he could measure out 1 3/4 cups of flour? Plz help thanks!

5. math

Find the area of the following plane figure. Use = 3.14. A circle has a radius of 8 cm. What is its area? Area (to the nearest tenth) =

6. chem 121

How many air molecules are in a 15.0×12.0×10.0 ft room? Assume atmospheric pressure of 1.00 atm, a room temperature of 20.0 ∘C, and ideal behavior. Volume conversion:There are 28.2 liters in one cubic foot.

7. Physics

A playground merry-go-round of radius R = 1.92m has a moment of inertia of I = 221kgm^2 and is rotating at 14.0rev/min about a frictionless vertical axle. Facing the axle, a 29.8kg child hops onto the merry-go-round and manages to sit down on its edge.

8. Physics

What is the magnitude of the momentum of a 10,000-kg truck whose speed is 12.0 m/s? What is the kinetic energy?

9. chemistry

Decomposition of nitrogen pentoxide in ccl4

10. Chemistry

A 25g piece of an unknown metal alloy at 150 degrees Celsius is dropped into an insulated container with 200 g of ice. Calculate the specific heat capacity of the metal, given that 9.0 g of ice melted. How would you work this out?

11. math

Find the area of the following plane figure. An ellipse has a major axis of 14 cm and a minor axis of 10 cm. Find its area. Area (to the nearest tenth) =

12. Physics

A light, rigid rod 1.039m in length joins two particles with masses 3.65kg and 4.94kg at its ends. The combination rotates in the xy plane about a pivot through the centre of the rod. Determine the angular momentum of the system about the origin when the

13. Physics

A 2.0-kg brick is moving at a speed of 6.0m/s. How large a force F is needed to stop the brick in a time of 7.0x10^-4 s?

14. conclusions

What function do conclusions serve in essays? A. Conclusions provide the supporting details of an essay. B. Conclusions develop the main idea of an essay. C. Conclusions sum up the main idea of an essay. (MY ANSWER) D. Conclusions introduce new ideas

15. Physics

A crane lifts a 1800-kg load of scrap metals to a distance of 15 m in 20 s. how much power is used in delivering the load?

16. Pre Calculus

Evaluate the function f(x) = log3 x at x =1/27 without using a calculator a. –4 b. –2 c. 1/27 d. –3 e. 27

Which of the following is a true statement about writing introductions of rough drafts? A. Do not worry about the central point of your essay; it will happen later on as you revise your paper. (MY ANSWER) B. Pay close attention to the correct spelling of

18. Chemistry

What volume of each of the following bases will react completely with 25.00 mL of 0.200 M HCl? a) 0.100 M NaOH b)0.0500 M Sr(OH)2 c)0.250 M KOH please explain and show detail I'm so lost on this problem... thanks!

19. Economics

1. Which of the following is the best example of a public good? A. Highway system B. Shopping mall C. Country club D. Movie theater 2. Which of the following is a characteristic of a public good? A. the private sector could provide it more efficiently B.

20. math

Jon Ericson bought a home with a 11.5% adjustable rate mortgage for 20 years. He paid \$10.67 monthly per thousand on his original loan. At the end of 2 years he owes the bank \$50,000. Now that interest rates have gone up to 13%, the bank will renew the

21. Physics

A ring (hollow cylinder) of mass 2.89kg, inner radius 5.35cm, and outer radius 6.35cm rolls (without slipping) up an inclined plane that makes an angle of θ=35.6°, as shown in the figure below. At the moment the ring is at position x = 1.87m up the

22. Chemistry 1111

To determine the molarity of NaOH solution, student took 3.5 g of KHP (KHP – Potassium hydrogen phthalate; Molar mass = 204.22 g/mol) and dissolved in 50 mL of water and titrated with the given unknown molarity NaOH solution loaded in burette. His

23. Economics

1. In the U.S free enterprise economy A. the proper role of government is clearly defined by economists and there are never disputes B. government's only role is to provide for the nation's defense C. the proper role of government is not clearly defined

24. Physics

A 0.142 kg remote control 24.0 cm long rests on a table, as shown in the figure(Figure 1) , with a length L overhanging its edge. To operate the power button on this remote requires a force of 0.355 N . How far can the remote control extend beyond the edge

25. Science

An object weighed 7N in air and 5N in water.If the object is immersed completely in water and the density of water is 1000kg m-3, calculate the ; (a) weight of water displaced, (b) Volume of the object (c) density of the object

26. Physics

A 23.5 N force acts on a body for duration of 12.0 s. Compute the impulse that the body receives.

27. math

The garage you work for as an auto mechanic measures 230 ft. by 150 ft and handles 69 cars. Using the existing garage as a model, how much space would you plan to have in your garage? Number of cars parked at any one time = 24. Required area of service

28. Physics

A ball is rolled off a horizontal roof at 6m/sec , after leaving the roof how long it will take to reach a speed of 10 m/sec? A. 0.20 seconds B. 0.81 seconds C. 1.8 seconds D. 2.5 seconds

29. AP Chemistry

Suppose you designed an experiment in which you burned a known quantity of magnesium in air. You used the product to determine how many moles of oxygen would react with the known number of moles of magnesium. Why would burning magnesium in air cause a

30. Physics

A roller coaster cart is pulled up to the top of the hill 45 m high before it plunges down to its lowest point, 5 m above the ground. What is the cart’s speed at this point? What is its potential energy if the mass of the object is 5 kg?

31. chemistry

0.02 Moles of HCl were added to a buffer solution, prepared by fluxing 20 L of gaseous NH3 and 10 L of gaseous HCl, both measured in normal conditions, in 2L of water. Calculate the pH of the solution before and after the HCl addition. (Kb NH3 = 1.8 *

32. CHEMISTRY

What mass of sulphur must be burned to produce 64.0 tonnes of sulphur dioxide. . . So far, I have calculated the molecular mass of SO2( 64.1 ) . and then found out the number of moles of sulphur dioxide. ( 998.4) What to do now?

33. math

When Mr. Lucky starts betting, he has 3 dollars. On any bet, he 7. wins with probability 1/3 and loses with probability 2/3. If he wins a bet, the total amount of money he has triples. If he loses a bet, he loses 2/3 of the total amount of money he has.

34. AP Chemistry

Is determining the excess reactant and limiting reactant an important part of a synthesis reaction? Is it an important part of a decomposition reaction? Explain.

35. home economics

Parts of home economics

36. AP Chemistry

Choose a chemical reaction involving two or more reactants. For this reaction, how do you determine which reactant or reactants are limiting? Explain.

37. Physics

A 2.8 kg duck is swimming at 0.35 m/s and a 3.4 kg goose is swimming at 0.75 m/s. Which bird would make the biggest impact on you if it carelessly swam into you? Explain. I'm not sure where to start. Could I have some help please?

38. math-steve

When Mr. Lucky starts betting, he has 3 dollars. On any bet, he wins with probability 1/3 and loses with probability 2/3. If he wins a bet, the total amount of money he has triples. If he loses a bet, he loses 2/3 of the total amount of money he has. Mr.

39. chemistry

Calculate the pH of a solution obtained dissolving 10 g of NH3 and 15 g of NH4Cl in 300 ml of water (Kb NH3 = 1.8 x10-5)

40. chemistry

Decomposition of nitrogen pentoxide in ccl4

41. Physics

An object with an initial velocity of 4 m/s moves along a straight axis under constant acceleration.Three sec later its velocity is 14m/s.How far did it travel during this time? A.27 B.17 C.67 D.57 E.77

42. Science

A car is travelling in the velocity of 20m/s.After 30 sec it covers a distance of 1200m.calculate the accelaration of the car and final velocity of the car.

43. Neuroscience

What type of cell in the central nervous system plays an important role in the uptake and processing of neurotransmitter from synaptic clefts/

44. roman numerals

what is IX more than XC?

Please help. The restaurant provides catering services to local businesses. Corporate clients paid by check or electronic transfers. A new customer paid for a catering order with a check for \$575, made payable to the restaurant. Woods took the check to the

46. Physics

A neutral solid conducting sphere of radius R has charge Q deposited in it, and is sitting at the centre of a conducting shell of inner radius 2R and outer radius 3R. After the conductor reaches equilibrium, find the potential at R

47. math

how many committee of five people can be chosen from 20 menand 12 women if exactly three men must be on each committee and at least four women on each committee

48. Math

How do you write 2.15 1/2 in expanded form. Our topic is transforming fractions in decimal form... but what is the fraction 1/2 doing there?

49. Pre Calculus

Assume that x, y, and a are positive numbers. Use the properties of logarithms to write the expression log a 9 xy in terms of the logarithms of x and y. a. 9logbx+9logby b. 19 l o g b ( x + y ) c. 19 l o g b x + l o g b y d. logbx+logby e. 19 l o g b x +

50. chemistry

To 100 mL of a 0.1M NH3(Kb=1.8*10-5)solution,200mL of a 0.1M NaOH have been obtained.

51. Physics

Can someone please explain how to tackle this problem? Cu - Anode electrode Zn - Cathode electrode A current of 2 amps is sustained for 16 minutes. what mass of Cu(s) is deposited on the zinc electrode? (Faradays' constant: 96500 C/mol e-) Please and thank

52. Physics

A 2.8 kg duck is swimming at 0.35 m/s and a 3.4 kg goose is swimming at 0.75 m/s. Which bird would make the biggest impact on you if it carelessly swam into you? Explain. I'm not sure where to start. Could I have some help please?

53. Chem

Can someone please explain how to tackle this problem? Cu - Anode electrode Zn - Cathode electrode A current of 2 amps is sustained for 16 minutes. what mass of Cu(s) is deposited on the zinc electrode? (Faradays' constant: 96500 C/mol e-)

54. Chemistry

What is the required volume of an acid to prepare 2 L of solution a 10% (v/v).

55. English

1. I'm particular about what I eat. 2. I'm picky about what I eat. 3. I'm choosy about what I eat. -------------------------- Are they all the same in meaning? Which one is commonly used? Do you have some more adjectives similar to 'picky'?

56. Physics

You jump across and down a crevasse from rest. You land on the other side at a speed of 10.5 m/s directed 67.6° below the horizontal. The other side is 4 meters lower. How wide was the crevasse? No Idea if I am doing this right. But so far what I done was

57. physics

WHAT IS WORK?

58. Analytical Chemistry

What volume, in liters, of 1.09 M KOH solution should be added to a 0.102 L solution containing 9.35 g of glutamic acid hydrochloride (Glu, FW = 183.59 g/mol; pKa1 = 2.23, pKa2 = 4.42, pKa3 = 9.95) to get to pH 10.26? Should I start with molar

59. math

if m set of 22 mathematics teachers and p is the set of 25 physics teachers and if 2 teachers both mathematics and physics, how many elements has MUP.

60. chemistry

Difference between a halogen and a halide? Explain using chemical formulas.

61. Physics/Mechanics

Two part Question: A load of 1500N is to be at Height of 3m above the ground. The available Incline planes are 10 degrees and 40 Degrees to the horizontal. Find out the Work Done by effort on the 10 degrees and 40 Degrees ramps. Assume the coefficient of

62. Pre Calculus

Identify the x-intercept of the function f(x) = 2 ln(x-3). a. x=3 b. x=0 c. x=2 d. x=4 e. The function has no x-intercept

63. chemistry

Determine the pH of a solution containing 1.00 mol/L of HCN (Ka = 5.00×10–10) and 5.00×10–2 mol/L of HCl.

64. math

the number that is IX more than XC?

65. PHYSICS

A BRIDGE IS CONSTRUCTED WITH LUMP OF WOOD 15M LONG ITS PIVOTED AT 2M FROM BOTH ENDS RESPECTIVELY, A THIN AND FAT MAN OF MASSES 30KG & 90KG RESPECTIVELY,STOOD AT POINT A & B,4.5M AND 10M,WHAT IS THE REACTION EXPERIENCED AT THE PIVOT THE BRIDGE

66. Math

A square, where s is an odd integer, is divided into unit squares. All the unit squares along the edges and the 2 diagonals of a square are discarded. Find a fully simplified expression, in terms of s, for the number of unit squares remaining answer.

67. Prealgebra

I've got a couple questions here, and I'm not sure how to solve any of them. 1. Armen is covering his countertop with new tile. His countertop is 3 meters long, and 2 meters wide. Each square tile is 10.5 centimeters on either side. Approximately how many

68. Physics

A catapult is launching rocks at your village. It is hiding in a forest. All you can measure is that the rock just passes over an 8 meter tall tree that is 73 meters from the village and that it takes 3 seconds for the rock to arrive from that moment. How

69. Physics

You jump across and down a crevasse from rest. You land on the other side at a speed of 10.5 m/s directed 67.6° below the horizontal. The other side is 4 meters lower. How wide was the crevasse? No Idea if I am doing this right. But so far what I done was

70. math

please help me solve this problem quickly! John and Melanie are designing a science experiment for the school science fair. Their experiment requires a large amount of copper wire. They need 22 spools of copper wire that each contains 31 meters of wire.

71. science

How many ml of alcohol are presentia,50ml bottle of rubbing alcohol?

72. science

A molecule has 8percent sulphur.this Will have minimum molecular mass

73. science

10, 20 and 30 are the three sets of vectors acting on a body.Then their resultant is ???

74. AP Chemistry

The G value for formation of gaseous water at 298 K and 1 atm is -278 kJ/mol. What is the nature of the spontaneity of formation of gaseous water at these conditions?

75. science

A massive particle at rest with mass M breaks up into two unequal 'u' to the right and the other piece travels at 'v'. to the left. What are the rest masses of these two pieces?

76. chemistry

Calculate the pH of a solution containing 10 g / L of NH4Cl (Kb NH3 = 1.8x10-5